/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ /* ***** BEGIN LICENSE BLOCK ***** * Version: MPL 1.1/GPL 2.0/LGPL 2.1 * * The contents of this file are subject to the Mozilla Public License Version * 1.1 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * http://www.mozilla.org/MPL/ * * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License * for the specific language governing rights and limitations under the * License. * * The Original Code is mozilla.org code. * * The Initial Developer of the Original Code is * Vladimir Vukicevic * Portions created by the Initial Developer are Copyright (C) 2005 * the Initial Developer. All Rights Reserved. * * Contributor(s): * * Alternatively, the contents of this file may be used under the terms of * either the GNU General Public License Version 2 or later (the "GPL"), or * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), * in which case the provisions of the GPL or the LGPL are applicable instead * of those above. If you wish to allow use of your version of this file only * under the terms of either the GPL or the LGPL, and not to allow others to * use your version of this file under the terms of the MPL, indicate your * decision by deleting the provisions above and replace them with the notice * and other provisions required by the GPL or the LGPL. If you do not delete * the provisions above, a recipient may use your version of this file under * the terms of any one of the MPL, the GPL or the LGPL. * * ***** END LICENSE BLOCK ***** */ #ifdef _MSC_VER #define _USE_MATH_DEFINES #endif #include #include "prmem.h" #include "nsIServiceManager.h" #include "nsContentUtils.h" #include "nsIDOMDocument.h" #include "nsIDocument.h" #include "nsIDOMCanvasRenderingContext2D.h" #include "nsICanvasRenderingContextInternal.h" #include "nsPresContext.h" #include "nsIPresShell.h" #include "nsIVariant.h" #include "imgIRequest.h" #include "imgIContainer.h" #include "gfxIImageFrame.h" #include "nsIDOMHTMLCanvasElement.h" #include "nsICanvasElement.h" #include "nsIDOMHTMLImageElement.h" #include "nsIImageLoadingContent.h" #include "nsIInterfaceRequestorUtils.h" #include "nsIImage.h" #include "nsIFrame.h" #include "nsDOMError.h" #include "nsIScriptError.h" #include "nsICSSParser.h" #include "nsICSSStyleRule.h" #include "nsStyleSet.h" #include "nsPrintfCString.h" #include "nsReadableUtils.h" #include "nsColor.h" #include "nsIRenderingContext.h" #include "nsIDeviceContext.h" #include "nsGfxCIID.h" #include "nsIScriptSecurityManager.h" #include "nsIDocShell.h" #include "nsPresContext.h" #include "nsIPresShell.h" #include "nsIDOMWindow.h" #include "nsPIDOMWindow.h" #include "nsIDocShell.h" #include "nsIDocShellTreeItem.h" #include "nsIDocShellTreeNode.h" #include "nsIXPConnect.h" #include "jsapi.h" #include "jsnum.h" #include "nsTArray.h" #include "cairo.h" #include "imgIEncoder.h" #include "gfxContext.h" #include "gfxASurface.h" #include "gfxImageSurface.h" #include "gfxPlatform.h" #include "gfxFont.h" #include "gfxTextRunCache.h" #include "nsFrameManager.h" #ifndef M_PI #define M_PI 3.14159265358979323846 #define M_PI_2 1.57079632679489661923 #endif static PRBool CheckSaneSubrectSize (PRInt32 x, PRInt32 y, PRInt32 w, PRInt32 h, PRInt32 realWidth, PRInt32 realHeight); /* Float validation stuff */ #define VALIDATE(_f) if (!JSDOUBLE_IS_FINITE(_f)) return PR_FALSE /* These must take doubles as args, because JSDOUBLE_IS_FINITE expects * to take the address of its argument; we can't cast/convert in the * macro. */ static PRBool FloatValidate (double f1) { VALIDATE(f1); return PR_TRUE; } static PRBool FloatValidate (double f1, double f2) { VALIDATE(f1); VALIDATE(f2); return PR_TRUE; } static PRBool FloatValidate (double f1, double f2, double f3) { VALIDATE(f1); VALIDATE(f2); VALIDATE(f3); return PR_TRUE; } static PRBool FloatValidate (double f1, double f2, double f3, double f4) { VALIDATE(f1); VALIDATE(f2); VALIDATE(f3); VALIDATE(f4); return PR_TRUE; } static PRBool FloatValidate (double f1, double f2, double f3, double f4, double f5) { VALIDATE(f1); VALIDATE(f2); VALIDATE(f3); VALIDATE(f4); VALIDATE(f5); return PR_TRUE; } static PRBool FloatValidate (double f1, double f2, double f3, double f4, double f5, double f6) { VALIDATE(f1); VALIDATE(f2); VALIDATE(f3); VALIDATE(f4); VALIDATE(f5); VALIDATE(f6); return PR_TRUE; } #undef VALIDATE /** ** nsCanvasGradient **/ #define NS_CANVASGRADIENT_PRIVATE_IID \ { 0x491d39d8, 0x4058, 0x42bd, { 0xac, 0x76, 0x70, 0xd5, 0x62, 0x7f, 0x02, 0x10 } } class nsCanvasGradient : public nsIDOMCanvasGradient { public: NS_DECLARE_STATIC_IID_ACCESSOR(NS_CANVASGRADIENT_PRIVATE_IID) nsCanvasGradient(cairo_pattern_t *cpat, nsICSSParser *cssparser) : mPattern(cpat), mCSSParser(cssparser) { } ~nsCanvasGradient() { if (mPattern) cairo_pattern_destroy(mPattern); } void Apply(cairo_t *cairo) { cairo_set_source(cairo, mPattern); } /* nsIDOMCanvasGradient */ NS_IMETHOD AddColorStop (float offset, const nsAString& colorstr) { nscolor color; if (!FloatValidate(offset)) return NS_ERROR_DOM_SYNTAX_ERR; if (offset < 0.0 || offset > 1.0) return NS_ERROR_DOM_INDEX_SIZE_ERR; nsresult rv = mCSSParser->ParseColorString(nsString(colorstr), nsnull, 0, &color); if (NS_FAILED(rv)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_pattern_add_color_stop_rgba (mPattern, (double) offset, NS_GET_R(color) / 255.0, NS_GET_G(color) / 255.0, NS_GET_B(color) / 255.0, NS_GET_A(color) / 255.0); return NS_OK; } NS_DECL_ISUPPORTS protected: cairo_pattern_t *mPattern; nsCOMPtr mCSSParser; }; NS_DEFINE_STATIC_IID_ACCESSOR(nsCanvasGradient, NS_CANVASGRADIENT_PRIVATE_IID) NS_IMPL_ADDREF(nsCanvasGradient) NS_IMPL_RELEASE(nsCanvasGradient) NS_INTERFACE_MAP_BEGIN(nsCanvasGradient) NS_INTERFACE_MAP_ENTRY(nsCanvasGradient) NS_INTERFACE_MAP_ENTRY(nsIDOMCanvasGradient) NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(CanvasGradient) NS_INTERFACE_MAP_ENTRY(nsISupports) NS_INTERFACE_MAP_END /** ** nsCanvasPattern **/ #define NS_CANVASPATTERN_PRIVATE_IID \ { 0xb85c6c8a, 0x0624, 0x4530, { 0xb8, 0xee, 0xff, 0xdf, 0x42, 0xe8, 0x21, 0x6d } } class nsCanvasPattern : public nsIDOMCanvasPattern { public: NS_DECLARE_STATIC_IID_ACCESSOR(NS_CANVASPATTERN_PRIVATE_IID) nsCanvasPattern(cairo_pattern_t *cpat, nsIPrincipal* principalForSecurityCheck, PRBool forceWriteOnly) : mPattern(cpat), mPrincipal(principalForSecurityCheck), mForceWriteOnly(forceWriteOnly) { NS_PRECONDITION(mPrincipal, "Must have a principal"); } ~nsCanvasPattern() { if (mPattern) cairo_pattern_destroy(mPattern); } void Apply(cairo_t *cairo) { cairo_set_source(cairo, mPattern); } nsIPrincipal* Principal() { return mPrincipal; } PRBool GetForceWriteOnly() { return mForceWriteOnly; } NS_DECL_ISUPPORTS protected: cairo_pattern_t *mPattern; PRUint8 *mData; nsCOMPtr mPrincipal; PRPackedBool mForceWriteOnly; }; NS_DEFINE_STATIC_IID_ACCESSOR(nsCanvasPattern, NS_CANVASPATTERN_PRIVATE_IID) NS_IMPL_ADDREF(nsCanvasPattern) NS_IMPL_RELEASE(nsCanvasPattern) NS_INTERFACE_MAP_BEGIN(nsCanvasPattern) NS_INTERFACE_MAP_ENTRY(nsCanvasPattern) NS_INTERFACE_MAP_ENTRY(nsIDOMCanvasPattern) NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(CanvasPattern) NS_INTERFACE_MAP_ENTRY(nsISupports) NS_INTERFACE_MAP_END /** ** nsTextMetrics **/ #define NS_TEXTMETRICS_PRIVATE_IID \ { 0xc5b1c2f9, 0xcb4f, 0x4394, { 0xaf, 0xe0, 0xc6, 0x59, 0x33, 0x80, 0x8b, 0xf3 } } class nsTextMetrics : public nsIDOMTextMetrics { public: nsTextMetrics(float w) : width(w) { } virtual ~nsTextMetrics() { } NS_DECLARE_STATIC_IID_ACCESSOR(NS_TEXTMETRICS_PRIVATE_IID) NS_IMETHOD GetWidth(float* w) { *w = width; return NS_OK; } NS_DECL_ISUPPORTS private: float width; }; NS_DEFINE_STATIC_IID_ACCESSOR(nsTextMetrics, NS_TEXTMETRICS_PRIVATE_IID) NS_IMPL_ADDREF(nsTextMetrics) NS_IMPL_RELEASE(nsTextMetrics) NS_INTERFACE_MAP_BEGIN(nsTextMetrics) NS_INTERFACE_MAP_ENTRY(nsTextMetrics) NS_INTERFACE_MAP_ENTRY(nsIDOMTextMetrics) NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(TextMetrics) NS_INTERFACE_MAP_ENTRY(nsISupports) NS_INTERFACE_MAP_END /** ** nsCanvasRenderingContext2D **/ class nsCanvasRenderingContext2D : public nsIDOMCanvasRenderingContext2D, public nsICanvasRenderingContextInternal { public: nsCanvasRenderingContext2D(); virtual ~nsCanvasRenderingContext2D(); nsresult Redraw(); void SetCairoColor(nscolor c); // nsICanvasRenderingContextInternal NS_IMETHOD SetCanvasElement(nsICanvasElement* aParentCanvas); NS_IMETHOD SetDimensions(PRInt32 width, PRInt32 height); NS_IMETHOD Render(gfxContext *ctx); NS_IMETHOD GetInputStream(const char* aMimeType, const PRUnichar* aEncoderOptions, nsIInputStream **aStream); NS_IMETHOD GetThebesSurface(gfxASurface **surface); NS_IMETHOD SetIsOpaque(PRBool isOpaque); // nsISupports interface NS_DECL_ISUPPORTS // nsIDOMCanvasRenderingContext2D interface NS_DECL_NSIDOMCANVASRENDERINGCONTEXT2D protected: // destroy cairo/image stuff, in preparation for possibly recreating void Destroy(); // Some helpers. Doesn't modify acolor on failure. enum { STYLE_STROKE = 0, STYLE_FILL, STYLE_SHADOW //STYLE_MAX }; // VC6 sucks #define STYLE_MAX 3 nsresult SetStyleFromVariant(nsIVariant* aStyle, PRInt32 aWhichStyle); void StyleColorToString(const nscolor& aColor, nsAString& aStr); void DirtyAllStyles(); void ApplyStyle(PRInt32 aWhichStyle); // If aPrincipal is not subsumed by this canvas element, then // we make the canvas write-only so bad guys can't extract the pixel // data. If forceWriteOnly is set, we force write only to be set // and ignore aPrincipal. (This is used for when the original data came // from a that had write-only set.) void DoDrawImageSecurityCheck(nsIPrincipal* aPrincipal, PRBool forceWriteOnly); // Member vars PRInt32 mWidth, mHeight; PRPackedBool mValid; PRPackedBool mOpaque; // the canvas element informs us when it's going away, // so these are not nsCOMPtrs nsICanvasElement* mCanvasElement; // our CSS parser, for colors and whatnot nsCOMPtr mCSSParser; // yay cairo nsRefPtr mThebesContext; nsRefPtr mThebesSurface; PRUint32 mSaveCount; cairo_t *mCairo; cairo_surface_t *mSurface; // text enum TextAlign { TEXT_ALIGN_START, TEXT_ALIGN_END, TEXT_ALIGN_LEFT, TEXT_ALIGN_RIGHT, TEXT_ALIGN_CENTER }; enum TextBaseline { TEXT_BASELINE_TOP, TEXT_BASELINE_HANGING, TEXT_BASELINE_MIDDLE, TEXT_BASELINE_ALPHABETIC, TEXT_BASELINE_IDEOGRAPHIC, TEXT_BASELINE_BOTTOM }; gfxFontGroup *GetCurrentFontStyle(); enum TextDrawOperation { TEXT_DRAW_OPERATION_FILL, TEXT_DRAW_OPERATION_STROKE }; /* * Implementation of the fillText and strokeText functions with the * operation abstracted to a flag. Follows the HTML 5 spec for rendering * text. Will query for the fourth, optional argument. */ nsresult drawText(const nsAString& text, float x, float y, float maxWidth, TextDrawOperation op); // style handling PRInt32 mLastStyle; PRPackedBool mDirtyStyle[STYLE_MAX]; // state stack handling class ContextState { public: ContextState() : globalAlpha(1.0), textAlign(TEXT_ALIGN_START), textBaseline(TEXT_BASELINE_ALPHABETIC) { } ContextState(const ContextState& other) : globalAlpha(other.globalAlpha), font(other.font), fontGroup(other.fontGroup), textAlign(other.textAlign), textBaseline(other.textBaseline) { for (int i = 0; i < STYLE_MAX; i++) { colorStyles[i] = other.colorStyles[i]; gradientStyles[i] = other.gradientStyles[i]; patternStyles[i] = other.patternStyles[i]; } } inline void SetColorStyle(int whichStyle, nscolor color) { colorStyles[whichStyle] = color; gradientStyles[whichStyle] = nsnull; patternStyles[whichStyle] = nsnull; } inline void SetPatternStyle(int whichStyle, nsCanvasPattern* pat) { gradientStyles[whichStyle] = nsnull; patternStyles[whichStyle] = pat; } inline void SetGradientStyle(int whichStyle, nsCanvasGradient* grad) { gradientStyles[whichStyle] = grad; patternStyles[whichStyle] = nsnull; } float globalAlpha; nsString font; nsRefPtr fontGroup; TextAlign textAlign; TextBaseline textBaseline; nscolor colorStyles[STYLE_MAX]; nsCOMPtr gradientStyles[STYLE_MAX]; nsCOMPtr patternStyles[STYLE_MAX]; }; nsTArray mStyleStack; inline ContextState& CurrentState() { return mStyleStack[mSaveCount]; } // stolen from nsJSUtils static PRBool ConvertJSValToUint32(PRUint32* aProp, JSContext* aContext, jsval aValue); static PRBool ConvertJSValToXPCObject(nsISupports** aSupports, REFNSIID aIID, JSContext* aContext, jsval aValue); static PRBool ConvertJSValToDouble(double* aProp, JSContext* aContext, jsval aValue); // cairo helpers nsresult CairoSurfaceFromElement(nsIDOMElement *imgElt, PRBool forceCopy, cairo_surface_t **aCairoSurface, PRInt32 *widthOut, PRInt32 *heightOut, nsIPrincipal **prinOut, PRBool *forceWriteOnlyOut); // other helpers void GetAppUnitsValues(PRUint32 *perDevPixel, PRUint32 *perCSSPixel) { // If we don't have a canvas element, we just return something generic. PRUint32 devPixel = 60; PRUint32 cssPixel = 60; nsCOMPtr elem = do_QueryInterface(mCanvasElement); if (elem) { nsIDocument *doc = elem->GetOwnerDoc(); if (!doc) goto FINISH; nsIPresShell *ps = doc->GetPrimaryShell(); if (!ps) goto FINISH; nsPresContext *pc = ps->GetPresContext(); if (!pc) goto FINISH; devPixel = pc->AppUnitsPerDevPixel(); cssPixel = pc->AppUnitsPerCSSPixel(); } FINISH: if (perDevPixel) *perDevPixel = devPixel; if (perCSSPixel) *perCSSPixel = cssPixel; } }; NS_IMPL_ADDREF(nsCanvasRenderingContext2D) NS_IMPL_RELEASE(nsCanvasRenderingContext2D) NS_INTERFACE_MAP_BEGIN(nsCanvasRenderingContext2D) NS_INTERFACE_MAP_ENTRY(nsIDOMCanvasRenderingContext2D) NS_INTERFACE_MAP_ENTRY(nsICanvasRenderingContextInternal) NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMCanvasRenderingContext2D) NS_INTERFACE_MAP_ENTRY_CONTENT_CLASSINFO(CanvasRenderingContext2D) NS_INTERFACE_MAP_END /** ** CanvasRenderingContext2D impl **/ nsresult NS_NewCanvasRenderingContext2D(nsIDOMCanvasRenderingContext2D** aResult) { nsIDOMCanvasRenderingContext2D* ctx = new nsCanvasRenderingContext2D(); if (!ctx) return NS_ERROR_OUT_OF_MEMORY; NS_ADDREF(*aResult = ctx); return NS_OK; } nsCanvasRenderingContext2D::nsCanvasRenderingContext2D() : mValid(PR_FALSE), mOpaque(PR_FALSE), mCanvasElement(nsnull), mSaveCount(0), mCairo(nsnull), mSurface(nsnull), mStyleStack(20) { } nsCanvasRenderingContext2D::~nsCanvasRenderingContext2D() { Destroy(); } void nsCanvasRenderingContext2D::Destroy() { mSurface = nsnull; mThebesSurface = nsnull; mCairo = nsnull; mThebesContext = nsnull; mValid = PR_FALSE; } nsresult nsCanvasRenderingContext2D::SetStyleFromVariant(nsIVariant* aStyle, PRInt32 aWhichStyle) { nsresult rv; nscolor color; PRUint16 paramType; rv = aStyle->GetDataType(¶mType); NS_ENSURE_SUCCESS(rv, rv); if (paramType == nsIDataType::VTYPE_DOMSTRING || paramType == nsIDataType::VTYPE_WSTRING_SIZE_IS) { nsAutoString str; if (paramType == nsIDataType::VTYPE_DOMSTRING) { rv = aStyle->GetAsDOMString(str); } else { rv = aStyle->GetAsAString(str); } NS_ENSURE_SUCCESS(rv, rv); rv = mCSSParser->ParseColorString(str, nsnull, 0, &color); if (NS_FAILED(rv)) { // Error reporting happens inside the CSS parser return NS_OK; } CurrentState().SetColorStyle(aWhichStyle, color); mDirtyStyle[aWhichStyle] = PR_TRUE; return NS_OK; } else if (paramType == nsIDataType::VTYPE_INTERFACE || paramType == nsIDataType::VTYPE_INTERFACE_IS) { nsID *iid; nsCOMPtr iface; rv = aStyle->GetAsInterface(&iid, getter_AddRefs(iface)); nsCOMPtr grad(do_QueryInterface(iface)); if (grad) { CurrentState().SetGradientStyle(aWhichStyle, grad); mDirtyStyle[aWhichStyle] = PR_TRUE; return NS_OK; } nsCOMPtr pattern(do_QueryInterface(iface)); if (pattern) { CurrentState().SetPatternStyle(aWhichStyle, pattern); mDirtyStyle[aWhichStyle] = PR_TRUE; return NS_OK; } } nsContentUtils::ReportToConsole( nsContentUtils::eDOM_PROPERTIES, "UnexpectedCanvasVariantStyle", nsnull, 0, nsnull, EmptyString(), 0, 0, nsIScriptError::warningFlag, "Canvas"); return NS_OK; } void nsCanvasRenderingContext2D::StyleColorToString(const nscolor& aColor, nsAString& aStr) { if (NS_GET_A(aColor) == 255) { CopyUTF8toUTF16(nsPrintfCString(100, "#%02x%02x%02x", NS_GET_R(aColor), NS_GET_G(aColor), NS_GET_B(aColor)), aStr); } else { // "%0.5f" in nsPrintfCString would use the locale-specific // decimal separator. That's why we have to do this: PRUint32 alpha = NS_GET_A(aColor) * 100000 / 255; CopyUTF8toUTF16(nsPrintfCString(100, "rgba(%d, %d, %d, 0.%d)", NS_GET_R(aColor), NS_GET_G(aColor), NS_GET_B(aColor), alpha), aStr); } } void nsCanvasRenderingContext2D::DirtyAllStyles() { for (int i = 0; i < STYLE_MAX; i++) { mDirtyStyle[i] = PR_TRUE; } } void nsCanvasRenderingContext2D::DoDrawImageSecurityCheck(nsIPrincipal* aPrincipal, PRBool forceWriteOnly) { NS_PRECONDITION(aPrincipal, "Must have a principal here"); // Callers should ensure that mCanvasElement is non-null before calling this if (!mCanvasElement) { NS_WARNING("DoDrawImageSecurityCheck called without canvas element!"); return; } if (mCanvasElement->IsWriteOnly()) return; // If we explicitly set WriteOnly just do it and get out if (forceWriteOnly) { mCanvasElement->SetWriteOnly(); return; } nsCOMPtr elem = do_QueryInterface(mCanvasElement); if (elem) { // XXXbz How could this actually be null? PRBool subsumes; nsresult rv = elem->NodePrincipal()->Subsumes(aPrincipal, &subsumes); if (NS_SUCCEEDED(rv) && subsumes) { // This canvas has access to that image anyway return; } } mCanvasElement->SetWriteOnly(); } void nsCanvasRenderingContext2D::ApplyStyle(PRInt32 aWhichStyle) { if (mLastStyle == aWhichStyle && !mDirtyStyle[aWhichStyle]) { // nothing to do, this is already the set style return; } mDirtyStyle[aWhichStyle] = PR_FALSE; mLastStyle = aWhichStyle; nsCanvasPattern* pattern = CurrentState().patternStyles[aWhichStyle]; if (pattern) { if (!mCanvasElement) return; DoDrawImageSecurityCheck(pattern->Principal(), pattern->GetForceWriteOnly()); pattern->Apply(mCairo); return; } if (CurrentState().gradientStyles[aWhichStyle]) { CurrentState().gradientStyles[aWhichStyle]->Apply(mCairo); return; } SetCairoColor(CurrentState().colorStyles[aWhichStyle]); } nsresult nsCanvasRenderingContext2D::Redraw() { if (!mCanvasElement) return nsnull; return mCanvasElement->InvalidateFrame(); } void nsCanvasRenderingContext2D::SetCairoColor(nscolor c) { double r = double(NS_GET_R(c) / 255.0); double g = double(NS_GET_G(c) / 255.0); double b = double(NS_GET_B(c) / 255.0); double a = double(NS_GET_A(c) / 255.0) * CurrentState().globalAlpha; cairo_set_source_rgba (mCairo, r, g, b, a); } NS_IMETHODIMP nsCanvasRenderingContext2D::SetDimensions(PRInt32 width, PRInt32 height) { Destroy(); mWidth = width; mHeight = height; // Check that the dimensions are sane if (gfxASurface::CheckSurfaceSize(gfxIntSize(width, height), 0xffff)) { gfxASurface::gfxImageFormat format = gfxASurface::ImageFormatARGB32; if (mOpaque) format = gfxASurface::ImageFormatRGB24; mThebesSurface = gfxPlatform::GetPlatform()->CreateOffscreenSurface (gfxIntSize(width, height), format); if (mThebesSurface->CairoStatus() == 0) { mThebesContext = new gfxContext(mThebesSurface); } } /* Create dummy surfaces here */ if (mThebesSurface == nsnull || mThebesSurface->CairoStatus() != 0 || mThebesContext == nsnull || mThebesContext->HasError()) { mThebesSurface = new gfxImageSurface(gfxIntSize(1,1), gfxASurface::ImageFormatARGB32); mThebesContext = new gfxContext(mThebesSurface); } else { mValid = PR_TRUE; } mSurface = mThebesSurface->CairoSurface(); mCairo = mThebesContext->GetCairo(); // set up the initial canvas defaults mStyleStack.Clear(); mSaveCount = 0; ContextState *state = mStyleStack.AppendElement(); state->globalAlpha = 1.0; for (int i = 0; i < STYLE_MAX; i++) state->colorStyles[i] = NS_RGB(0,0,0); mLastStyle = -1; DirtyAllStyles(); cairo_set_operator(mCairo, CAIRO_OPERATOR_CLEAR); cairo_new_path(mCairo); cairo_rectangle(mCairo, 0, 0, mWidth, mHeight); cairo_fill(mCairo); cairo_set_line_width(mCairo, 1.0); cairo_set_operator(mCairo, CAIRO_OPERATOR_OVER); cairo_set_miter_limit(mCairo, 10.0); cairo_set_line_cap(mCairo, CAIRO_LINE_CAP_BUTT); cairo_set_line_join(mCairo, CAIRO_LINE_JOIN_MITER); cairo_new_path(mCairo); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetIsOpaque(PRBool isOpaque) { if (isOpaque == mOpaque) return NS_OK; mOpaque = isOpaque; if (mValid) { /* If we've already been created, let SetDimensions take care of * recreating our surface */ return SetDimensions(mWidth, mHeight); } return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::Render(gfxContext *ctx) { nsresult rv = NS_OK; if (!mValid || !mSurface || !mCairo || cairo_surface_status(mSurface) != CAIRO_STATUS_SUCCESS || cairo_status(mCairo) != CAIRO_STATUS_SUCCESS) return NS_ERROR_FAILURE; if (!mThebesSurface) return NS_ERROR_FAILURE; nsRefPtr pat = new gfxPattern(mThebesSurface); gfxContext::GraphicsOperator op = ctx->CurrentOperator(); if (mOpaque) ctx->SetOperator(gfxContext::OPERATOR_SOURCE); // XXX I don't want to use PixelSnapped here, but layout doesn't guarantee // pixel alignment for this stuff! ctx->NewPath(); ctx->PixelSnappedRectangleAndSetPattern(gfxRect(0, 0, mWidth, mHeight), pat); ctx->Fill(); if (mOpaque) ctx->SetOperator(op); return rv; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetInputStream(const char *aMimeType, const PRUnichar *aEncoderOptions, nsIInputStream **aStream) { if (!mValid || !mSurface || cairo_status(mCairo) != CAIRO_STATUS_SUCCESS || cairo_surface_status(mSurface) != CAIRO_STATUS_SUCCESS) return NS_ERROR_FAILURE; nsresult rv; const char encoderPrefix[] = "@mozilla.org/image/encoder;2?type="; nsAutoArrayPtr conid(new (std::nothrow) char[strlen(encoderPrefix) + strlen(aMimeType) + 1]); if (!conid) return NS_ERROR_OUT_OF_MEMORY; strcpy(conid, encoderPrefix); strcat(conid, aMimeType); nsCOMPtr encoder = do_CreateInstance(conid); if (!encoder) return NS_ERROR_FAILURE; nsAutoArrayPtr imageBuffer(new (std::nothrow) PRUint8[mWidth * mHeight * 4]); if (!imageBuffer) return NS_ERROR_OUT_OF_MEMORY; cairo_surface_t *imgsurf = cairo_image_surface_create_for_data (imageBuffer.get(), CAIRO_FORMAT_ARGB32, mWidth, mHeight, mWidth * 4); if (!imgsurf || cairo_surface_status(imgsurf)) return NS_ERROR_FAILURE; cairo_t *cr = cairo_create(imgsurf); cairo_surface_destroy (imgsurf); cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE); cairo_set_source_surface (cr, mSurface, 0, 0); cairo_paint (cr); cairo_destroy (cr); rv = encoder->InitFromData(imageBuffer.get(), mWidth * mHeight * 4, mWidth, mHeight, mWidth * 4, imgIEncoder::INPUT_FORMAT_HOSTARGB, nsDependentString(aEncoderOptions)); NS_ENSURE_SUCCESS(rv, rv); return CallQueryInterface(encoder, aStream); } // // nsCanvasRenderingContext2D impl // NS_IMETHODIMP nsCanvasRenderingContext2D::SetCanvasElement(nsICanvasElement* aCanvasElement) { // don't hold a ref to this! mCanvasElement = aCanvasElement; // set up our css parser, if necessary if (!mCSSParser) { mCSSParser = do_CreateInstance("@mozilla.org/content/css-parser;1"); } return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetCanvas(nsIDOMHTMLCanvasElement **canvas) { if (mCanvasElement == nsnull) { *canvas = nsnull; return NS_OK; } return CallQueryInterface(mCanvasElement, canvas); } // // state // NS_IMETHODIMP nsCanvasRenderingContext2D::Save() { ContextState state = CurrentState(); mStyleStack.AppendElement(state); cairo_save (mCairo); mSaveCount++; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::Restore() { if (mSaveCount == 0) return NS_OK; if (mSaveCount < 0) return NS_ERROR_DOM_INVALID_STATE_ERR; mStyleStack.RemoveElementAt(mSaveCount); cairo_restore (mCairo); mLastStyle = -1; DirtyAllStyles(); mSaveCount--; return NS_OK; } // // transformations // NS_IMETHODIMP nsCanvasRenderingContext2D::Scale(float x, float y) { if (!FloatValidate(x,y)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_scale (mCairo, x, y); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::Rotate(float angle) { if (!FloatValidate(angle)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_rotate (mCairo, angle); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::Translate(float x, float y) { if (!FloatValidate(x,y)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_translate (mCairo, x, y); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::Transform(float m11, float m12, float m21, float m22, float dx, float dy) { if (!FloatValidate(m11,m12,m21,m22,dx,dy)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_matrix_t mat; cairo_matrix_init (&mat, m11, m12, m21, m22, dx, dy); cairo_transform (mCairo, &mat); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetTransform(float m11, float m12, float m21, float m22, float dx, float dy) { if (!FloatValidate(m11,m12,m21,m22,dx,dy)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_matrix_t mat; cairo_matrix_init (&mat, m11, m12, m21, m22, dx, dy); cairo_set_matrix (mCairo, &mat); return NS_OK; } // // colors // NS_IMETHODIMP nsCanvasRenderingContext2D::SetGlobalAlpha(float aGlobalAlpha) { if (!FloatValidate(aGlobalAlpha)) return NS_ERROR_DOM_SYNTAX_ERR; // ignore invalid values, as per spec if (aGlobalAlpha < 0.0 || aGlobalAlpha > 1.0) return NS_OK; CurrentState().globalAlpha = aGlobalAlpha; DirtyAllStyles(); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetGlobalAlpha(float *aGlobalAlpha) { *aGlobalAlpha = CurrentState().globalAlpha; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetStrokeStyle(nsIVariant* aStyle) { return SetStyleFromVariant(aStyle, STYLE_STROKE); } NS_IMETHODIMP nsCanvasRenderingContext2D::GetStrokeStyle(nsIVariant** aStyle) { nsresult rv; nsCOMPtr var = do_CreateInstance("@mozilla.org/variant;1"); if (!var) return NS_ERROR_FAILURE; rv = var->SetWritable(PR_TRUE); NS_ENSURE_SUCCESS(rv, rv); if (CurrentState().patternStyles[STYLE_STROKE]) { rv = var->SetAsISupports(CurrentState().patternStyles[STYLE_STROKE]); NS_ENSURE_SUCCESS(rv, rv); } else if (CurrentState().gradientStyles[STYLE_STROKE]) { rv = var->SetAsISupports(CurrentState().gradientStyles[STYLE_STROKE]); NS_ENSURE_SUCCESS(rv, rv); } else { nsString styleStr; StyleColorToString(CurrentState().colorStyles[STYLE_STROKE], styleStr); rv = var->SetAsDOMString(styleStr); NS_ENSURE_SUCCESS(rv, rv); } NS_ADDREF(*aStyle = var); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetFillStyle(nsIVariant* aStyle) { return SetStyleFromVariant(aStyle, STYLE_FILL); } NS_IMETHODIMP nsCanvasRenderingContext2D::GetFillStyle(nsIVariant** aStyle) { nsresult rv; nsCOMPtr var = do_CreateInstance("@mozilla.org/variant;1"); if (!var) return NS_ERROR_FAILURE; rv = var->SetWritable(PR_TRUE); NS_ENSURE_SUCCESS(rv, rv); if (CurrentState().patternStyles[STYLE_FILL]) { rv = var->SetAsISupports(CurrentState().patternStyles[STYLE_FILL]); NS_ENSURE_SUCCESS(rv, rv); } else if (CurrentState().gradientStyles[STYLE_FILL]) { rv = var->SetAsISupports(CurrentState().gradientStyles[STYLE_FILL]); NS_ENSURE_SUCCESS(rv, rv); } else { nsString styleStr; StyleColorToString(CurrentState().colorStyles[STYLE_FILL], styleStr); rv = var->SetAsDOMString(styleStr); NS_ENSURE_SUCCESS(rv, rv); } NS_ADDREF(*aStyle = var); return NS_OK; } // // gradients and patterns // NS_IMETHODIMP nsCanvasRenderingContext2D::CreateLinearGradient(float x0, float y0, float x1, float y1, nsIDOMCanvasGradient **_retval) { if (!FloatValidate(x0,y0,x1,y1)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_pattern_t *gradpat = nsnull; gradpat = cairo_pattern_create_linear ((double) x0, (double) y0, (double) x1, (double) y1); nsCanvasGradient *grad = new nsCanvasGradient(gradpat, mCSSParser); if (!grad) { cairo_pattern_destroy(gradpat); return NS_ERROR_OUT_OF_MEMORY; } NS_ADDREF(*_retval = grad); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::CreateRadialGradient(float x0, float y0, float r0, float x1, float y1, float r1, nsIDOMCanvasGradient **_retval) { if (!FloatValidate(x0,y0,r0,x1,y1,r1)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_pattern_t *gradpat = nsnull; gradpat = cairo_pattern_create_radial ((double) x0, (double) y0, (double) r0, (double) x1, (double) y1, (double) r1); nsCanvasGradient *grad = new nsCanvasGradient(gradpat, mCSSParser); if (!grad) { cairo_pattern_destroy(gradpat); return NS_ERROR_OUT_OF_MEMORY; } NS_ADDREF(*_retval = grad); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::CreatePattern(nsIDOMHTMLElement *image, const nsAString& repeat, nsIDOMCanvasPattern **_retval) { nsresult rv; cairo_extend_t extend; if (repeat.IsEmpty() || repeat.EqualsLiteral("repeat")) { extend = CAIRO_EXTEND_REPEAT; } else if (repeat.EqualsLiteral("repeat-x")) { // XX extend = CAIRO_EXTEND_REPEAT; } else if (repeat.EqualsLiteral("repeat-y")) { // XX extend = CAIRO_EXTEND_REPEAT; } else if (repeat.EqualsLiteral("no-repeat")) { extend = CAIRO_EXTEND_NONE; } else { // XXX ERRMSG we need to report an error to developers here! (bug 329026) return NS_ERROR_DOM_SYNTAX_ERR; } cairo_surface_t *imgSurf = nsnull; PRInt32 imgWidth, imgHeight; nsCOMPtr principal; PRBool forceWriteOnly = PR_FALSE; rv = CairoSurfaceFromElement(image, PR_TRUE, &imgSurf, &imgWidth, &imgHeight, getter_AddRefs(principal), &forceWriteOnly); if (NS_FAILED(rv)) return rv; cairo_pattern_t *cairopat = cairo_pattern_create_for_surface(imgSurf); cairo_surface_destroy(imgSurf); cairo_pattern_set_extend (cairopat, extend); nsCanvasPattern *pat = new nsCanvasPattern(cairopat, principal, forceWriteOnly); if (!pat) { cairo_pattern_destroy(cairopat); return NS_ERROR_OUT_OF_MEMORY; } NS_ADDREF(*_retval = pat); return NS_OK; } // // shadows // NS_IMETHODIMP nsCanvasRenderingContext2D::SetShadowOffsetX(float x) { if (!FloatValidate(x)) return NS_ERROR_DOM_SYNTAX_ERR; // XXX ERRMSG we need to report an error to developers here! (bug 329026) return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetShadowOffsetX(float *x) { *x = 0.0f; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetShadowOffsetY(float y) { if (!FloatValidate(y)) return NS_ERROR_DOM_SYNTAX_ERR; // XXX ERRMSG we need to report an error to developers here! (bug 329026) return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetShadowOffsetY(float *y) { *y = 0.0f; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetShadowBlur(float blur) { if (!FloatValidate(blur)) return NS_ERROR_DOM_SYNTAX_ERR; // XXX ERRMSG we need to report an error to developers here! (bug 329026) return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetShadowBlur(float *blur) { *blur = 0.0f; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetShadowColor(const nsAString& color) { // XXX ERRMSG we need to report an error to developers here! (bug 329026) return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetShadowColor(nsAString& color) { color.SetIsVoid(PR_TRUE); return NS_OK; } // // rects // NS_IMETHODIMP nsCanvasRenderingContext2D::ClearRect(float x, float y, float w, float h) { if (!FloatValidate(x,y,w,h)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_path_t *old_path = cairo_copy_path (mCairo); cairo_save (mCairo); cairo_set_operator (mCairo, CAIRO_OPERATOR_CLEAR); cairo_new_path (mCairo); cairo_rectangle (mCairo, x, y, w, h); cairo_fill (mCairo); cairo_restore (mCairo); cairo_new_path (mCairo); if (old_path->status == CAIRO_STATUS_SUCCESS && old_path->num_data != 0) cairo_append_path (mCairo, old_path); cairo_path_destroy (old_path); return Redraw(); } NS_IMETHODIMP nsCanvasRenderingContext2D::FillRect(float x, float y, float w, float h) { if (!FloatValidate(x,y,w,h)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_path_t *old_path = cairo_copy_path (mCairo); cairo_new_path (mCairo); cairo_rectangle (mCairo, x, y, w, h); ApplyStyle(STYLE_FILL); cairo_fill (mCairo); cairo_new_path (mCairo); if (old_path->status == CAIRO_STATUS_SUCCESS && old_path->num_data != 0) cairo_append_path (mCairo, old_path); cairo_path_destroy (old_path); return Redraw(); } NS_IMETHODIMP nsCanvasRenderingContext2D::StrokeRect(float x, float y, float w, float h) { if (!FloatValidate(x,y,w,h)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_path_t *old_path = cairo_copy_path (mCairo); cairo_new_path (mCairo); cairo_rectangle (mCairo, x, y, w, h); ApplyStyle(STYLE_STROKE); cairo_stroke (mCairo); cairo_new_path (mCairo); if (old_path->status == CAIRO_STATUS_SUCCESS && old_path->num_data != 0) cairo_append_path (mCairo, old_path); cairo_path_destroy (old_path); return Redraw(); } // // path bits // NS_IMETHODIMP nsCanvasRenderingContext2D::BeginPath() { cairo_new_path(mCairo); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::ClosePath() { cairo_close_path(mCairo); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::Fill() { ApplyStyle(STYLE_FILL); cairo_fill_preserve(mCairo); return Redraw(); } NS_IMETHODIMP nsCanvasRenderingContext2D::Stroke() { ApplyStyle(STYLE_STROKE); cairo_stroke_preserve(mCairo); return Redraw(); } NS_IMETHODIMP nsCanvasRenderingContext2D::Clip() { cairo_clip_preserve(mCairo); return Redraw(); } NS_IMETHODIMP nsCanvasRenderingContext2D::MoveTo(float x, float y) { if (!FloatValidate(x,y)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_move_to(mCairo, x, y); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::LineTo(float x, float y) { if (!FloatValidate(x,y)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_line_to(mCairo, x, y); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::QuadraticCurveTo(float cpx, float cpy, float x, float y) { if (!FloatValidate(cpx,cpy,x,y)) return NS_ERROR_DOM_SYNTAX_ERR; double cx, cy; // we will always have a current point, since beginPath forces // a moveto(0,0) cairo_get_current_point(mCairo, &cx, &cy); cairo_curve_to(mCairo, (cx + cpx * 2.0) / 3.0, (cy + cpy * 2.0) / 3.0, (cpx * 2.0 + x) / 3.0, (cpy * 2.0 + y) / 3.0, x, y); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::BezierCurveTo(float cp1x, float cp1y, float cp2x, float cp2y, float x, float y) { if (!FloatValidate(cp1x,cp1y,cp2x,cp2y,x,y)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_curve_to(mCairo, cp1x, cp1y, cp2x, cp2y, x, y); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::ArcTo(float x1, float y1, float x2, float y2, float radius) { if (!FloatValidate(x1,y1,x2,y2,radius)) return NS_ERROR_DOM_SYNTAX_ERR; if (radius <= 0) return NS_ERROR_DOM_INDEX_SIZE_ERR; /* This is an adaptation of the cairo_arc_to patch from Behdad * Esfahbod; once that patch is accepted, we should remove this * and just call cairo_arc_to() directly. */ double x0, y0; double angle0, angle1, angle2, angled; double d0, d2; double sin_, cos_; double xc, yc, dc; int forward; cairo_get_current_point(mCairo, &x0, &y0); angle0 = atan2 (y0 - y1, x0 - x1); /* angle from (x1,y1) to (x0,y0) */ angle2 = atan2 (y2 - y1, x2 - x1); /* angle from (x1,y1) to (x2,y2) */ angle1 = (angle0 + angle2) / 2; /* angle from (x1,y1) to (xc,yc) */ angled = angle2 - angle0; /* the angle (x0,y0)--(x1,y1)--(x2,y2) */ /* Shall we go forward or backward? */ if (angled > M_PI || (angled < 0 && angled > -M_PI)) { angle1 += M_PI; angled = 2 * M_PI - angled; forward = 1; } else { double tmp; tmp = angle0; angle0 = angle2; angle2 = tmp; forward = 0; } angle0 += M_PI_2; /* angle from (xc,yc) to (x0,y0) */ angle2 -= M_PI_2; /* angle from (xc,yc) to (x2,y2) */ angled /= 2; /* the angle (x0,y0)--(x1,y1)--(xc,yc) */ /* distance from (x1,y1) to (x0,y0) */ d0 = sqrt ((x0-x1)*(x0-x1)+(y0-y1)*(y0-y1)); /* distance from (x2,y2) to (x0,y0) */ d2 = sqrt ((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)); dc = -1; sin_ = sin(angled); cos_ = cos(angled); if (fabs(cos_) >= 1e-5) { /* the arc may not fit */ /* min distance of end-points from corner */ double min_d = d0 < d2 ? d0 : d2; /* max radius of an arc that fits */ double max_r = min_d * sin_ / cos_; if (radius > max_r) { /* arc with requested radius doesn't fit */ radius = (float) max_r; dc = min_d / cos_; /* distance of (xc,yc) from (x1,y1) */ } } if (dc < 0) dc = radius / sin_; /* distance of (xc,yc) from (x1,y1) */ /* find (cx,cy), the center of the arc */ xc = x1 + sin(angle1) * dc; yc = y1 + cos(angle1) * dc; /* the arc operation draws the line from current point (x0,y0) * to arc center too. */ if (forward) cairo_arc (mCairo, xc, yc, radius, angle0, angle2); else cairo_arc_negative (mCairo, xc, yc, radius, angle2, angle0); cairo_line_to (mCairo, x2, y2); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::Arc(float x, float y, float r, float startAngle, float endAngle, int ccw) { if (!FloatValidate(x,y,r,startAngle,endAngle)) return NS_ERROR_DOM_SYNTAX_ERR; if (ccw) cairo_arc_negative (mCairo, x, y, r, startAngle, endAngle); else cairo_arc (mCairo, x, y, r, startAngle, endAngle); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::Rect(float x, float y, float w, float h) { if (!FloatValidate(x,y,w,h)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_rectangle (mCairo, x, y, w, h); return NS_OK; } // // text // NS_IMETHODIMP nsCanvasRenderingContext2D::SetFont(const nsAString& font) { if(CurrentState().font.Equals(font)) return NS_OK; nsCOMPtr elem = do_QueryInterface(mCanvasElement); if (!elem) { NS_WARNING("Canvas element must be an nsINode and non-null"); return NS_ERROR_FAILURE; } nsIPrincipal* elemPrincipal = elem->NodePrincipal(); nsIDocument* elemDocument = elem->GetOwnerDoc(); if (!elemDocument || !elemPrincipal) { NS_WARNING("Element is missing document or principal"); return NS_ERROR_FAILURE; } nsIPresShell* presShell = elemDocument->GetPrimaryShell(); if (!presShell) return NS_ERROR_FAILURE; nsIURI *docURL = elemDocument->GetDocumentURI(); nsIURI *baseURL = elemDocument->GetBaseURI(); nsCString langGroup; presShell->GetPresContext()->GetLangGroup()->ToUTF8String(langGroup); nsCOMArray rules; PRBool changed; nsCOMPtr rule; mCSSParser->ParseStyleAttribute( EmptyString(), docURL, baseURL, elemPrincipal, getter_AddRefs(rule)); mCSSParser->ParseProperty(eCSSProperty_font, font, docURL, baseURL, elemPrincipal, rule->GetDeclaration(), &changed); rules.AppendObject(rule); nsStyleSet *styleSet = presShell->StyleSet(); // get the frame's style context to use as the parent if (!mCanvasElement) { return NS_ERROR_FAILURE; } nsIFrame* frame; if (mCanvasElement->GetPrimaryCanvasFrame(&frame)!=NS_OK) { return NS_ERROR_FAILURE; } nsRefPtr sc = styleSet->ResolveStyleForRules(frame->GetStyleContext(), rules); const nsStyleFont *fontStyle = sc->GetStyleFont(); NS_ASSERTION(fontStyle, "Could not obtain font style"); PRUint32 aupdp = presShell->GetPresContext()->AppUnitsPerDevPixel(); gfxFontStyle style(fontStyle->mFont.style, fontStyle->mFont.weight, NSAppUnitsToFloatPixels(fontStyle->mFont.size,aupdp), langGroup, fontStyle->mFont.sizeAdjust, fontStyle->mFont.systemFont, fontStyle->mFont.familyNameQuirks); CurrentState().fontGroup = gfxPlatform::GetPlatform()->CreateFontGroup(fontStyle->mFont.name, &style); NS_ASSERTION(CurrentState().fontGroup, "Could not get font group"); CurrentState().font = font; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetFont(nsAString& font) { /* will initilize the value if not set, else does nothing */ GetCurrentFontStyle(); font = CurrentState().font; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetTextAlign(const nsAString& ta) { if (ta.EqualsLiteral("start")) CurrentState().textAlign = TEXT_ALIGN_START; else if (ta.EqualsLiteral("end")) CurrentState().textAlign = TEXT_ALIGN_END; else if (ta.EqualsLiteral("left")) CurrentState().textAlign = TEXT_ALIGN_LEFT; else if (ta.EqualsLiteral("right")) CurrentState().textAlign = TEXT_ALIGN_RIGHT; else if (ta.EqualsLiteral("center")) CurrentState().textAlign = TEXT_ALIGN_CENTER; // spec says to not throw error for invalid arg, but do it anyway else return NS_ERROR_INVALID_ARG; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetTextAlign(nsAString& ta) { switch (CurrentState().textAlign) { case TEXT_ALIGN_START: ta.AssignLiteral("start"); break; case TEXT_ALIGN_END: ta.AssignLiteral("end"); break; case TEXT_ALIGN_LEFT: ta.AssignLiteral("left"); break; case TEXT_ALIGN_RIGHT: ta.AssignLiteral("right"); break; case TEXT_ALIGN_CENTER: ta.AssignLiteral("center"); break; default: NS_ASSERTION(0, "textAlign holds invalid value"); return NS_ERROR_FAILURE; } return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetTextBaseline(const nsAString& tb) { if (tb.EqualsLiteral("top")) CurrentState().textBaseline = TEXT_BASELINE_TOP; else if (tb.EqualsLiteral("hanging")) CurrentState().textBaseline = TEXT_BASELINE_HANGING; else if (tb.EqualsLiteral("middle")) CurrentState().textBaseline = TEXT_BASELINE_MIDDLE; else if (tb.EqualsLiteral("alphabetic")) CurrentState().textBaseline = TEXT_BASELINE_ALPHABETIC; else if (tb.EqualsLiteral("ideographic")) CurrentState().textBaseline = TEXT_BASELINE_IDEOGRAPHIC; else if (tb.EqualsLiteral("bottom")) CurrentState().textBaseline = TEXT_BASELINE_BOTTOM; // spec says to not throw error for invalid arg, but do it anyway else return NS_ERROR_INVALID_ARG; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetTextBaseline(nsAString& tb) { switch (CurrentState().textBaseline) { case TEXT_BASELINE_TOP: tb.AssignLiteral("top"); break; case TEXT_BASELINE_HANGING: tb.AssignLiteral("hanging"); break; case TEXT_BASELINE_MIDDLE: tb.AssignLiteral("middle"); break; case TEXT_BASELINE_ALPHABETIC: tb.AssignLiteral("alphabetic"); break; case TEXT_BASELINE_IDEOGRAPHIC: tb.AssignLiteral("ideographic"); break; case TEXT_BASELINE_BOTTOM: tb.AssignLiteral("bottom"); break; default: NS_ASSERTION(0, "textBaseline holds invalid value"); return NS_ERROR_FAILURE; } return NS_OK; } /* * Helper function that replaces the whitespace characters in a string * with U+0020 SPACE. The whitespace characters are defined as U+0020 SPACE, * U+0009 CHARACTER TABULATION (tab), U+000A LINE FEED (LF), U+000B LINE * TABULATION, U+000C FORM FEED (FF), and U+000D CARRIAGE RETURN (CR). * @param str The string whose whitespace characters to replace. */ static inline void TextReplaceWhitespaceCharacters(nsAutoString& str) { str.ReplaceChar("\x09\x0A\x0B\x0C\x0D", PRUnichar(' ')); } NS_IMETHODIMP nsCanvasRenderingContext2D::FillText(const nsAString& text, float x, float y, float maxWidth) { return drawText(text, x, y, maxWidth, TEXT_DRAW_OPERATION_FILL); } NS_IMETHODIMP nsCanvasRenderingContext2D::StrokeText(const nsAString& text, float x, float y, float maxWidth) { return drawText(text, x, y, maxWidth, TEXT_DRAW_OPERATION_STROKE); } nsresult nsCanvasRenderingContext2D::drawText(const nsAString& rawText, float x, float y, float maxWidth, TextDrawOperation op) { if (!FloatValidate(x, y, maxWidth)) return NS_ERROR_DOM_SYNTAX_ERR; // get js context to parse extra arg nsresult rv; // spec isn't clear on what should happen if maxWidth <= 0, so // treat it as an invalid argument // technically, 0 should be an invalid value as well, but 0 is the default // arg, and there is no way to tell if the default was used if (maxWidth < 0) return NS_ERROR_INVALID_ARG; gfxFontGroup* fontgrp = GetCurrentFontStyle(); NS_ASSERTION(fontgrp, "font group is null"); // replace all the whitespace characters with U+0020 SPACE nsAutoString textToDraw(rawText); TextReplaceWhitespaceCharacters(textToDraw); const PRUnichar* textData; textToDraw.GetData(&textData); // get direction property from the frame nsIFrame* frame; rv = mCanvasElement->GetPrimaryCanvasFrame(&frame); if (NS_FAILED(rv)) return rv; PRBool isRTL = frame->GetStyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL; PRUint32 textrunflags = isRTL ? gfxTextRunFactory::TEXT_IS_RTL : 0; // app units conversion factor PRUint32 aupdp; GetAppUnitsValues(&aupdp, NULL); gfxTextRunCache::AutoTextRun textRun; textRun = gfxTextRunCache::MakeTextRun(textData, textToDraw.Length(), fontgrp, mThebesContext, aupdp, textrunflags); if (!textRun.get()) return NS_ERROR_FAILURE; gfxPoint pt(x, y); // get the text width PRBool tightBoundingBox = PR_FALSE; gfxTextRun::Metrics textRunMetrics = textRun->MeasureText(/* offset = */ 0, textToDraw.Length(), tightBoundingBox, mThebesContext, nsnull); gfxFloat textWidth = textRunMetrics.mAdvanceWidth/gfxFloat(aupdp); // offset pt x based on text align gfxFloat anchorX; if (CurrentState().textAlign == TEXT_ALIGN_CENTER) anchorX = .5; else if (CurrentState().textAlign == TEXT_ALIGN_LEFT || (!isRTL && CurrentState().textAlign == TEXT_ALIGN_START) || (isRTL && CurrentState().textAlign == TEXT_ALIGN_END)) anchorX = 0; else anchorX = 1; if (isRTL) pt.x += (1 - anchorX) * textWidth; else pt.x -= anchorX * textWidth; // offset pt y based on text baseline NS_ASSERTION(fontgrp->FontListLength()>0, "font group contains no fonts"); const gfxFont::Metrics& fontMetrics = fontgrp->GetFontAt(0)->GetMetrics(); gfxFloat anchorY; switch (CurrentState().textBaseline) { case TEXT_BASELINE_TOP: anchorY = fontMetrics.emAscent; break; case TEXT_BASELINE_HANGING: anchorY = 0; // currently unavailable break; case TEXT_BASELINE_MIDDLE: anchorY = (fontMetrics.emAscent-fontMetrics.emDescent)*.5f; break; case TEXT_BASELINE_ALPHABETIC: anchorY = 0; break; case TEXT_BASELINE_IDEOGRAPHIC: anchorY = 0; // currently unvailable break; case TEXT_BASELINE_BOTTOM: anchorY = -fontMetrics.emDescent; break; default: NS_ASSERTION(0, "mTextBaseline holds invalid value"); return NS_ERROR_FAILURE; } pt.y += anchorY; // if text is over maxWidth, then scale the text horizonally such that its // width is precisely maxWidth if (maxWidth>0 && textWidth > maxWidth) { cairo_save(mCairo); // translate the anchor point to 0, then scale and translate back cairo_translate(mCairo, x, 0); cairo_scale(mCairo, (float)(maxWidth/textWidth), 1); cairo_translate(mCairo, -x, 0); } pt.x *= aupdp; pt.y *= aupdp; // stroke or fill depending on operation if (op == TEXT_DRAW_OPERATION_STROKE) { cairo_save(mCairo); cairo_new_path(mCairo); textRun->DrawToPath(mThebesContext, pt, /* offset = */ 0, textToDraw.Length(), nsnull, nsnull); Stroke(); cairo_restore(mCairo); } else { NS_ASSERTION(op == TEXT_DRAW_OPERATION_FILL, "operation should be FILL or STROKE"); ApplyStyle(STYLE_FILL); textRun->Draw(mThebesContext, pt, /* offset = */ 0, textToDraw.Length(), nsnull, nsnull, nsnull); } // have to restore the context if was modified above if (maxWidth>0 && textWidth > maxWidth) cairo_restore(mCairo); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::MeasureText(const nsAString& rawText, nsIDOMTextMetrics** _retval) { // replace all the whitespace characters with U+0020 SPACE nsAutoString textToMeasure(rawText); TextReplaceWhitespaceCharacters(textToMeasure); const PRUnichar* textdata; textToMeasure.GetData(&textdata); PRUint32 textrunflags = 0; PRUint32 aupdp; GetAppUnitsValues(&aupdp, nsnull); gfxTextRunCache::AutoTextRun textRun; textRun = gfxTextRunCache::MakeTextRun(textdata, textToMeasure.Length(), GetCurrentFontStyle(), mThebesContext, aupdp, textrunflags); if(!textRun.get()) return NS_ERROR_FAILURE; PRBool tightBoundingBox = PR_FALSE; gfxTextRun::Metrics metrics = textRun->MeasureText(/* offset = */ 0, textToMeasure.Length(), tightBoundingBox, mThebesContext, nsnull); float textWidth = float(metrics.mAdvanceWidth/gfxFloat(aupdp)); nsTextMetrics *textMetrics = new nsTextMetrics(textWidth); if (!textMetrics) return NS_ERROR_OUT_OF_MEMORY; NS_ADDREF(*_retval = textMetrics); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetMozTextStyle(const nsAString& textStyle) { // font and mozTextStyle are the same value return SetFont(textStyle); } NS_IMETHODIMP nsCanvasRenderingContext2D::GetMozTextStyle(nsAString& textStyle) { // font and mozTextStyle are the same value return GetFont(textStyle); } gfxFontGroup *nsCanvasRenderingContext2D::GetCurrentFontStyle() { // use lazy initilization for the font group since it's rather expensive if(!CurrentState().fontGroup) { nsAutoString style; style.AssignLiteral("10px sans-serif"); nsresult res = SetMozTextStyle(style); NS_ASSERTION(res == NS_OK, "Default canvas font is invalid"); } return CurrentState().fontGroup; } NS_IMETHODIMP nsCanvasRenderingContext2D::MozDrawText(const nsAString& textToDraw) { const PRUnichar* textdata; textToDraw.GetData(&textdata); PRUint32 textrunflags = 0; PRUint32 aupdp; GetAppUnitsValues(&aupdp, NULL); gfxTextRunCache::AutoTextRun textRun; textRun = gfxTextRunCache::MakeTextRun(textdata, textToDraw.Length(), GetCurrentFontStyle(), mThebesContext, aupdp, textrunflags); if(!textRun.get()) return NS_ERROR_FAILURE; gfxPoint pt(0.0f,0.0f); // Fill color is text color ApplyStyle(STYLE_FILL); textRun->Draw(mThebesContext, pt, /* offset = */ 0, textToDraw.Length(), nsnull, nsnull, nsnull); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::MozMeasureText(const nsAString& textToMeasure, float *retVal) { nsCOMPtr metrics; nsresult rv; rv = MeasureText(textToMeasure, getter_AddRefs(metrics)); if (NS_FAILED(rv)) return rv; return metrics->GetWidth(retVal); } NS_IMETHODIMP nsCanvasRenderingContext2D::MozPathText(const nsAString& textToPath) { const PRUnichar* textdata; textToPath.GetData(&textdata); PRUint32 textrunflags = 0; PRUint32 aupdp; GetAppUnitsValues(&aupdp, NULL); gfxTextRunCache::AutoTextRun textRun; textRun = gfxTextRunCache::MakeTextRun(textdata, textToPath.Length(), GetCurrentFontStyle(), mThebesContext, aupdp, textrunflags); if(!textRun.get()) return NS_ERROR_FAILURE; gfxPoint pt(0.0f,0.0f); textRun->DrawToPath(mThebesContext, pt, /* offset = */ 0, textToPath.Length(), nsnull, nsnull); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::MozTextAlongPath(const nsAString& textToDraw, PRBool stroke) { // Most of this code is copied from its svg equivalent nsRefPtr path(mThebesContext->GetFlattenedPath()); const PRUnichar* textdata; textToDraw.GetData(&textdata); PRUint32 textrunflags = 0; PRUint32 aupdp; GetAppUnitsValues(&aupdp, NULL); gfxTextRunCache::AutoTextRun textRun; textRun = gfxTextRunCache::MakeTextRun(textdata, textToDraw.Length(), GetCurrentFontStyle(), mThebesContext, aupdp, textrunflags); if(!textRun.get()) return NS_ERROR_FAILURE; struct PathChar { PRBool draw; gfxFloat angle; gfxPoint pos; PathChar() : draw(PR_FALSE), angle(0.0), pos(0.0,0.0) {} }; gfxFloat length = path->GetLength(); PRUint32 strLength = textToDraw.Length(); PathChar *cp = new PathChar[strLength]; if (!cp) { return NS_ERROR_OUT_OF_MEMORY; } gfxPoint position(0.0,0.0); gfxFloat x = position.x; for (PRUint32 i = 0; i < strLength; i++) { gfxFloat halfAdvance = textRun->GetAdvanceWidth(i, 1, nsnull) / (2.0 * aupdp); // Check for end of path if(x + halfAdvance > length) break; if(x + halfAdvance >= 0) { cp[i].draw = PR_TRUE; gfxPoint pt = path->FindPoint(gfxPoint(x + halfAdvance, position.y), &(cp[i].angle)); cp[i].pos = pt - gfxPoint(cos(cp[i].angle), sin(cp[i].angle)) * halfAdvance; } x += 2 * halfAdvance; } if(stroke) ApplyStyle(STYLE_STROKE); else ApplyStyle(STYLE_FILL); for(PRUint32 i = 0; i < strLength; i++) { // Skip non-visible characters if(!cp[i].draw) continue; gfxMatrix matrix = mThebesContext->CurrentMatrix(); gfxMatrix rot; rot.Rotate(cp[i].angle); mThebesContext->Multiply(rot); rot.Invert(); rot.Scale(aupdp,aupdp); gfxPoint pt = rot.Transform(cp[i].pos); if(stroke) { textRun->DrawToPath(mThebesContext, pt, i, 1, nsnull, nsnull); } else { textRun->Draw(mThebesContext, pt, i, 1, nsnull, nsnull, nsnull); } mThebesContext->SetMatrix(matrix); } delete [] cp; return NS_OK; } // // line caps/joins // NS_IMETHODIMP nsCanvasRenderingContext2D::SetLineWidth(float width) { if (!FloatValidate(width)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_set_line_width(mCairo, width); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetLineWidth(float *width) { double d = cairo_get_line_width(mCairo); *width = (float) d; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetLineCap(const nsAString& capstyle) { cairo_line_cap_t cap; if (capstyle.EqualsLiteral("butt")) cap = CAIRO_LINE_CAP_BUTT; else if (capstyle.EqualsLiteral("round")) cap = CAIRO_LINE_CAP_ROUND; else if (capstyle.EqualsLiteral("square")) cap = CAIRO_LINE_CAP_SQUARE; else // XXX ERRMSG we need to report an error to developers here! (bug 329026) return NS_ERROR_NOT_IMPLEMENTED; cairo_set_line_cap (mCairo, cap); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetLineCap(nsAString& capstyle) { cairo_line_cap_t cap = cairo_get_line_cap(mCairo); if (cap == CAIRO_LINE_CAP_BUTT) capstyle.AssignLiteral("butt"); else if (cap == CAIRO_LINE_CAP_ROUND) capstyle.AssignLiteral("round"); else if (cap == CAIRO_LINE_CAP_SQUARE) capstyle.AssignLiteral("square"); else return NS_ERROR_FAILURE; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetLineJoin(const nsAString& joinstyle) { cairo_line_join_t j; if (joinstyle.EqualsLiteral("round")) j = CAIRO_LINE_JOIN_ROUND; else if (joinstyle.EqualsLiteral("bevel")) j = CAIRO_LINE_JOIN_BEVEL; else if (joinstyle.EqualsLiteral("miter")) j = CAIRO_LINE_JOIN_MITER; else // XXX ERRMSG we need to report an error to developers here! (bug 329026) return NS_ERROR_NOT_IMPLEMENTED; cairo_set_line_join (mCairo, j); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetLineJoin(nsAString& joinstyle) { cairo_line_join_t j = cairo_get_line_join(mCairo); if (j == CAIRO_LINE_JOIN_ROUND) joinstyle.AssignLiteral("round"); else if (j == CAIRO_LINE_JOIN_BEVEL) joinstyle.AssignLiteral("bevel"); else if (j == CAIRO_LINE_JOIN_MITER) joinstyle.AssignLiteral("miter"); else return NS_ERROR_FAILURE; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetMiterLimit(float miter) { if (!FloatValidate(miter)) return NS_ERROR_DOM_SYNTAX_ERR; cairo_set_miter_limit(mCairo, miter); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetMiterLimit(float *miter) { double d = cairo_get_miter_limit(mCairo); *miter = (float) d; return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::IsPointInPath(float x, float y, PRBool *retVal) { if (!FloatValidate(x,y)) return NS_ERROR_DOM_SYNTAX_ERR; *retVal = !!cairo_in_fill(mCairo, x, y); return NS_OK; } // // image // // drawImage(in HTMLImageElement image, in float dx, in float dy); // -- render image from 0,0 at dx,dy top-left coords // drawImage(in HTMLImageElement image, in float dx, in float dy, in float sw, in float sh); // -- render image from 0,0 at dx,dy top-left coords clipping it to sw,sh // drawImage(in HTMLImageElement image, in float sx, in float sy, in float sw, in float sh, in float dx, in float dy, in float dw, in float dh); // -- render the region defined by (sx,sy,sw,wh) in image-local space into the region (dx,dy,dw,dh) on the canvas NS_IMETHODIMP nsCanvasRenderingContext2D::DrawImage() { nsresult rv; // we can't do a security check without a canvas element, so // just skip this entirely if (!mCanvasElement) return NS_ERROR_FAILURE; nsAXPCNativeCallContext *ncc = nsnull; rv = nsContentUtils::XPConnect()-> GetCurrentNativeCallContext(&ncc); NS_ENSURE_SUCCESS(rv, rv); if (!ncc) return NS_ERROR_FAILURE; JSContext *ctx = nsnull; rv = ncc->GetJSContext(&ctx); NS_ENSURE_SUCCESS(rv, rv); PRUint32 argc; jsval *argv = nsnull; ncc->GetArgc(&argc); ncc->GetArgvPtr(&argv); // we always need at least an image and a dx,dy if (argc < 3) return NS_ERROR_INVALID_ARG; JSAutoRequest ar(ctx); double sx,sy,sw,sh; double dx,dy,dw,dh; nsCOMPtr imgElt; if (!ConvertJSValToXPCObject(getter_AddRefs(imgElt), NS_GET_IID(nsIDOMElement), ctx, argv[0])) return NS_ERROR_DOM_TYPE_MISMATCH_ERR; cairo_surface_t *imgSurf = nsnull; cairo_matrix_t surfMat; cairo_pattern_t *pat; cairo_path_t *old_path; PRInt32 imgWidth, imgHeight; nsCOMPtr principal; PRBool forceWriteOnly = PR_FALSE; rv = CairoSurfaceFromElement(imgElt, PR_FALSE, &imgSurf, &imgWidth, &imgHeight, getter_AddRefs(principal), &forceWriteOnly); if (NS_FAILED(rv)) return rv; DoDrawImageSecurityCheck(principal, forceWriteOnly); #define GET_ARG(dest,whicharg) \ do { if (!ConvertJSValToDouble(dest, ctx, whicharg)) { rv = NS_ERROR_INVALID_ARG; goto FINISH; } } while (0) rv = NS_OK; if (argc == 3) { GET_ARG(&dx, argv[1]); GET_ARG(&dy, argv[2]); sx = sy = 0.0; dw = sw = (double) imgWidth; dh = sh = (double) imgHeight; } else if (argc == 5) { GET_ARG(&dx, argv[1]); GET_ARG(&dy, argv[2]); GET_ARG(&dw, argv[3]); GET_ARG(&dh, argv[4]); sx = sy = 0.0; sw = (double) imgWidth; sh = (double) imgHeight; } else if (argc == 9) { GET_ARG(&sx, argv[1]); GET_ARG(&sy, argv[2]); GET_ARG(&sw, argv[3]); GET_ARG(&sh, argv[4]); GET_ARG(&dx, argv[5]); GET_ARG(&dy, argv[6]); GET_ARG(&dw, argv[7]); GET_ARG(&dh, argv[8]); } else { // XXX ERRMSG we need to report an error to developers here! (bug 329026) rv = NS_ERROR_INVALID_ARG; goto FINISH; } #undef GET_ARG if (dw == 0.0 || dh == 0.0) { rv = NS_OK; // not really failure, but nothing to do -- // and noone likes a divide-by-zero goto FINISH; } if (!FloatValidate(sx,sy,sw,sh) || !FloatValidate(dx,dy,dw,dh)) { rv = NS_ERROR_DOM_SYNTAX_ERR; goto FINISH; } // check args if (sx < 0.0 || sy < 0.0 || sw < 0.0 || sw > (double) imgWidth || sh < 0.0 || sh > (double) imgHeight || dw < 0.0 || dh < 0.0) { // XXX ERRMSG we need to report an error to developers here! (bug 329026) rv = NS_ERROR_DOM_INDEX_SIZE_ERR; goto FINISH; } cairo_matrix_init_translate(&surfMat, sx, sy); cairo_matrix_scale(&surfMat, sw/dw, sh/dh); pat = cairo_pattern_create_for_surface(imgSurf); cairo_pattern_set_matrix(pat, &surfMat); old_path = cairo_copy_path(mCairo); cairo_save(mCairo); cairo_translate(mCairo, dx, dy); cairo_new_path(mCairo); cairo_rectangle(mCairo, 0, 0, dw, dh); cairo_set_source(mCairo, pat); cairo_clip(mCairo); cairo_paint_with_alpha(mCairo, CurrentState().globalAlpha); cairo_restore(mCairo); #if 1 // XXX cairo bug workaround; force a clip update on mCairo. // Otherwise, a pixman clip gets left around somewhere, and pixman // (Render) does source clipping as well -- so we end up // compositing with an incorrect clip. This only seems to affect // fallback cases, which happen when we have CSS scaling going on. // This will blow away the current path, but we already blew it // away in this function earlier. cairo_new_path(mCairo); cairo_rectangle(mCairo, 0, 0, 0, 0); cairo_fill(mCairo); #endif cairo_pattern_destroy(pat); cairo_new_path(mCairo); if (old_path->status == CAIRO_STATUS_SUCCESS && old_path->num_data != 0) cairo_append_path(mCairo, old_path); cairo_path_destroy(old_path); FINISH: if (imgSurf) cairo_surface_destroy(imgSurf); if (NS_SUCCEEDED(rv)) rv = Redraw(); return rv; } NS_IMETHODIMP nsCanvasRenderingContext2D::SetGlobalCompositeOperation(const nsAString& op) { cairo_operator_t cairo_op; #define CANVAS_OP_TO_CAIRO_OP(cvsop,cairoop) \ if (op.EqualsLiteral(cvsop)) \ cairo_op = CAIRO_OPERATOR_##cairoop; // XXX "darker" isn't really correct CANVAS_OP_TO_CAIRO_OP("clear", CLEAR) else CANVAS_OP_TO_CAIRO_OP("copy", SOURCE) else CANVAS_OP_TO_CAIRO_OP("darker", SATURATE) // XXX else CANVAS_OP_TO_CAIRO_OP("destination-atop", DEST_ATOP) else CANVAS_OP_TO_CAIRO_OP("destination-in", DEST_IN) else CANVAS_OP_TO_CAIRO_OP("destination-out", DEST_OUT) else CANVAS_OP_TO_CAIRO_OP("destination-over", DEST_OVER) else CANVAS_OP_TO_CAIRO_OP("lighter", ADD) else CANVAS_OP_TO_CAIRO_OP("source-atop", ATOP) else CANVAS_OP_TO_CAIRO_OP("source-in", IN) else CANVAS_OP_TO_CAIRO_OP("source-out", OUT) else CANVAS_OP_TO_CAIRO_OP("source-over", OVER) else CANVAS_OP_TO_CAIRO_OP("xor", XOR) // not part of spec, kept here for compat else CANVAS_OP_TO_CAIRO_OP("over", OVER) else return NS_ERROR_NOT_IMPLEMENTED; #undef CANVAS_OP_TO_CAIRO_OP cairo_set_operator(mCairo, cairo_op); return NS_OK; } NS_IMETHODIMP nsCanvasRenderingContext2D::GetGlobalCompositeOperation(nsAString& op) { cairo_operator_t cairo_op = cairo_get_operator(mCairo); #define CANVAS_OP_TO_CAIRO_OP(cvsop,cairoop) \ if (cairo_op == CAIRO_OPERATOR_##cairoop) \ op.AssignLiteral(cvsop); // XXX "darker" isn't really correct CANVAS_OP_TO_CAIRO_OP("clear", CLEAR) else CANVAS_OP_TO_CAIRO_OP("copy", SOURCE) else CANVAS_OP_TO_CAIRO_OP("darker", SATURATE) // XXX else CANVAS_OP_TO_CAIRO_OP("destination-atop", DEST_ATOP) else CANVAS_OP_TO_CAIRO_OP("destination-in", DEST_IN) else CANVAS_OP_TO_CAIRO_OP("destination-out", DEST_OUT) else CANVAS_OP_TO_CAIRO_OP("destination-over", DEST_OVER) else CANVAS_OP_TO_CAIRO_OP("lighter", ADD) else CANVAS_OP_TO_CAIRO_OP("source-atop", ATOP) else CANVAS_OP_TO_CAIRO_OP("source-in", IN) else CANVAS_OP_TO_CAIRO_OP("source-out", OUT) else CANVAS_OP_TO_CAIRO_OP("source-over", OVER) else CANVAS_OP_TO_CAIRO_OP("xor", XOR) else return NS_ERROR_FAILURE; #undef CANVAS_OP_TO_CAIRO_OP return NS_OK; } // // Utils // PRBool nsCanvasRenderingContext2D::ConvertJSValToUint32(PRUint32* aProp, JSContext* aContext, jsval aValue) { uint32 temp; if (::JS_ValueToECMAUint32(aContext, aValue, &temp)) { *aProp = (PRUint32)temp; } else { ::JS_ReportError(aContext, "Parameter must be an integer"); return JS_FALSE; } return JS_TRUE; } PRBool nsCanvasRenderingContext2D::ConvertJSValToDouble(double* aProp, JSContext* aContext, jsval aValue) { jsdouble temp; if (::JS_ValueToNumber(aContext, aValue, &temp)) { *aProp = (jsdouble)temp; } else { ::JS_ReportError(aContext, "Parameter must be a number"); return JS_FALSE; } return JS_TRUE; } PRBool nsCanvasRenderingContext2D::ConvertJSValToXPCObject(nsISupports** aSupports, REFNSIID aIID, JSContext* aContext, jsval aValue) { *aSupports = nsnull; if (JSVAL_IS_NULL(aValue)) { return JS_TRUE; } if (JSVAL_IS_OBJECT(aValue)) { // WrapJS does all the work to recycle an existing wrapper and/or do a QI nsresult rv = nsContentUtils::XPConnect()-> WrapJS(aContext, JSVAL_TO_OBJECT(aValue), aIID, (void**)aSupports); return NS_SUCCEEDED(rv); } return JS_FALSE; } /* cairo ARGB32 surfaces are ARGB stored as a packed 32-bit integer; on little-endian * platforms, they appear as BGRA bytes in the surface data. The color values are also * stored with premultiplied alpha. * * If forceCopy is FALSE, a surface may be returned that's only valid during the current * operation. If it's TRUE, a copy will always be made that can safely be retained. */ nsresult nsCanvasRenderingContext2D::CairoSurfaceFromElement(nsIDOMElement *imgElt, PRBool forceCopy, cairo_surface_t **aCairoSurface, PRInt32 *widthOut, PRInt32 *heightOut, nsIPrincipal **prinOut, PRBool *forceWriteOnlyOut) { nsresult rv; nsCOMPtr imgContainer; nsCOMPtr imageLoader = do_QueryInterface(imgElt); if (imageLoader) { nsCOMPtr imgRequest; rv = imageLoader->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST, getter_AddRefs(imgRequest)); NS_ENSURE_SUCCESS(rv, rv); if (!imgRequest) // XXX ERRMSG we need to report an error to developers here! (bug 329026) return NS_ERROR_NOT_AVAILABLE; PRUint32 status; imgRequest->GetImageStatus(&status); if ((status & imgIRequest::STATUS_LOAD_COMPLETE) == 0) return NS_ERROR_NOT_AVAILABLE; nsCOMPtr uri; rv = imgRequest->GetImagePrincipal(prinOut); NS_ENSURE_SUCCESS(rv, rv); NS_ENSURE_TRUE(*prinOut, NS_ERROR_DOM_SECURITY_ERR); *forceWriteOnlyOut = PR_FALSE; rv = imgRequest->GetImage(getter_AddRefs(imgContainer)); NS_ENSURE_SUCCESS(rv, rv); } else { // maybe a canvas nsCOMPtr canvas = do_QueryInterface(imgElt); nsCOMPtr node = do_QueryInterface(imgElt); if (canvas && node) { PRUint32 w, h; rv = canvas->GetSize(&w, &h); NS_ENSURE_SUCCESS(rv, rv); nsRefPtr sourceSurface; if (!forceCopy && canvas->CountContexts() == 1) { nsICanvasRenderingContextInternal *srcCanvas = canvas->GetContextAtIndex(0); rv = srcCanvas->GetThebesSurface(getter_AddRefs(sourceSurface)); if (NS_FAILED(rv)) sourceSurface = nsnull; } if (sourceSurface == nsnull) { nsRefPtr surf = gfxPlatform::GetPlatform()->CreateOffscreenSurface (gfxIntSize(w, h), gfxASurface::ImageFormatARGB32); nsRefPtr ctx = new gfxContext(surf); // we have to clear first, since some platform surfaces (X11, I'm // looking at you) don't follow the cleared-surface convention. ctx->SetOperator(gfxContext::OPERATOR_CLEAR); ctx->Paint(); ctx->SetOperator(gfxContext::OPERATOR_OVER); rv = canvas->RenderContexts(ctx); if (NS_FAILED(rv)) return rv; sourceSurface = surf; } *aCairoSurface = sourceSurface->CairoSurface(); cairo_surface_reference(*aCairoSurface); *widthOut = w; *heightOut = h; NS_ADDREF(*prinOut = node->NodePrincipal()); *forceWriteOnlyOut = canvas->IsWriteOnly(); return NS_OK; } else { NS_WARNING("No way to get surface from non-canvas, non-imageloader"); return NS_ERROR_NOT_AVAILABLE; } } if (!imgContainer) return NS_ERROR_NOT_AVAILABLE; nsCOMPtr frame; rv = imgContainer->GetCurrentFrame(getter_AddRefs(frame)); NS_ENSURE_SUCCESS(rv, rv); nsCOMPtr img(do_GetInterface(frame)); PRInt32 imgWidth, imgHeight; rv = frame->GetWidth(&imgWidth); rv |= frame->GetHeight(&imgHeight); if (NS_FAILED(rv)) return NS_ERROR_FAILURE; if (widthOut) *widthOut = imgWidth; if (heightOut) *heightOut = imgHeight; nsRefPtr gfxpattern; img->GetPattern(getter_AddRefs(gfxpattern)); nsRefPtr gfxsurf = gfxpattern->GetSurface(); if (!gfxsurf) { gfxsurf = new gfxImageSurface (gfxIntSize(imgWidth, imgHeight), gfxASurface::ImageFormatARGB32); nsRefPtr ctx = new gfxContext(gfxsurf); ctx->SetOperator(gfxContext::OPERATOR_SOURCE); ctx->SetPattern(gfxpattern); ctx->Paint(); } *aCairoSurface = gfxsurf->CairoSurface(); cairo_surface_reference (*aCairoSurface); return NS_OK; } /* Check that the rect [x,y,w,h] is a valid subrect of [0,0,realWidth,realHeight] * without overflowing any integers and the like. */ PRBool CheckSaneSubrectSize (PRInt32 x, PRInt32 y, PRInt32 w, PRInt32 h, PRInt32 realWidth, PRInt32 realHeight) { if (w <= 0 || h <= 0 || x < 0 || y < 0) return PR_FALSE; if (x >= realWidth || w > (realWidth - x) || y >= realHeight || h > (realHeight - y)) return PR_FALSE; return PR_TRUE; } static void FlushLayoutForTree(nsIDOMWindow* aWindow) { nsCOMPtr piWin = do_QueryInterface(aWindow); if (!piWin) return; // Note that because FlushPendingNotifications flushes parents, this // is O(N^2) in docshell tree depth. However, the docshell tree is // usually pretty shallow. nsCOMPtr domDoc; aWindow->GetDocument(getter_AddRefs(domDoc)); nsCOMPtr doc = do_QueryInterface(domDoc); if (doc) { doc->FlushPendingNotifications(Flush_Layout); } nsCOMPtr node = do_QueryInterface(piWin->GetDocShell()); if (node) { PRInt32 i = 0, i_end; node->GetChildCount(&i_end); for (; i < i_end; ++i) { nsCOMPtr item; node->GetChildAt(i, getter_AddRefs(item)); nsCOMPtr win = do_GetInterface(item); if (win) { FlushLayoutForTree(win); } } } } NS_IMETHODIMP nsCanvasRenderingContext2D::DrawWindow(nsIDOMWindow* aWindow, PRInt32 aX, PRInt32 aY, PRInt32 aW, PRInt32 aH, const nsAString& aBGColor) { NS_ENSURE_ARG(aWindow != nsnull); // protect against too-large surfaces that will cause allocation // or overflow issues if (!gfxASurface::CheckSurfaceSize(gfxIntSize(aW, aH), 0xffff)) return NS_ERROR_FAILURE; // We can't allow web apps to call this until we fix at least the // following potential security issues: // -- rendering cross-domain IFRAMEs and then extracting the results // -- rendering the user's theme and then extracting the results // -- rendering native anonymous content (e.g., file input paths; // scrollbars should be allowed) if (!nsContentUtils::IsCallerTrustedForRead()) { // not permitted to use DrawWindow // XXX ERRMSG we need to report an error to developers here! (bug 329026) return NS_ERROR_DOM_SECURITY_ERR; } // Flush layout updates FlushLayoutForTree(aWindow); nsCOMPtr presContext; nsCOMPtr win = do_QueryInterface(aWindow); if (win) { nsIDocShell* docshell = win->GetDocShell(); if (docshell) { docshell->GetPresContext(getter_AddRefs(presContext)); } } if (!presContext) return NS_ERROR_FAILURE; nscolor bgColor; nsresult rv = mCSSParser->ParseColorString(PromiseFlatString(aBGColor), nsnull, 0, &bgColor); NS_ENSURE_SUCCESS(rv, rv); nsIPresShell* presShell = presContext->PresShell(); NS_ENSURE_TRUE(presShell, NS_ERROR_FAILURE); nsRect r(nsPresContext::CSSPixelsToAppUnits(aX), nsPresContext::CSSPixelsToAppUnits(aY), nsPresContext::CSSPixelsToAppUnits(aW), nsPresContext::CSSPixelsToAppUnits(aH)); presShell->RenderDocument(r, PR_FALSE, PR_TRUE, bgColor, mThebesContext); // get rid of the pattern surface ref, just in case cairo_set_source_rgba (mCairo, 1, 1, 1, 1); DirtyAllStyles(); Redraw(); return rv; } // // device pixel getting/setting // // ImageData getImageData (in float x, in float y, in float width, in float height); NS_IMETHODIMP nsCanvasRenderingContext2D::GetImageData() { if (!mValid || !mCanvasElement) return NS_ERROR_FAILURE; if (mCanvasElement->IsWriteOnly() && !nsContentUtils::IsCallerTrustedForRead()) { // XXX ERRMSG we need to report an error to developers here! (bug 329026) return NS_ERROR_DOM_SECURITY_ERR; } nsAXPCNativeCallContext *ncc = nsnull; nsresult rv = nsContentUtils::XPConnect()-> GetCurrentNativeCallContext(&ncc); NS_ENSURE_SUCCESS(rv, rv); if (!ncc) return NS_ERROR_FAILURE; JSContext *ctx = nsnull; rv = ncc->GetJSContext(&ctx); NS_ENSURE_SUCCESS(rv, rv); PRUint32 argc; jsval *argv = nsnull; ncc->GetArgc(&argc); ncc->GetArgvPtr(&argv); JSAutoRequest ar(ctx); int32 x, y, w, h; if (!JS_ConvertArguments (ctx, argc, argv, "jjjj", &x, &y, &w, &h)) return NS_ERROR_DOM_SYNTAX_ERR; if (!CheckSaneSubrectSize (x, y, w, h, mWidth, mHeight)) return NS_ERROR_DOM_SYNTAX_ERR; nsAutoArrayPtr surfaceData (new (std::nothrow) PRUint8[w * h * 4]); int surfaceDataStride = w*4; int surfaceDataOffset = 0; if (!surfaceData) return NS_ERROR_OUT_OF_MEMORY; cairo_surface_t *tmpsurf = cairo_image_surface_create_for_data (surfaceData, CAIRO_FORMAT_ARGB32, w, h, w*4); cairo_t *tmpcr = cairo_create (tmpsurf); cairo_set_operator (tmpcr, CAIRO_OPERATOR_SOURCE); cairo_set_source_surface (tmpcr, mSurface, -(int)x, -(int)y); cairo_paint (tmpcr); cairo_destroy (tmpcr); cairo_surface_destroy (tmpsurf); PRUint32 len = w * h * 4; if (len > (((PRUint32)0xfff00000)/sizeof(jsval))) return NS_ERROR_INVALID_ARG; nsAutoArrayPtr jsvector(new (std::nothrow) jsval[w * h * 4]); if (!jsvector) return NS_ERROR_OUT_OF_MEMORY; jsval *dest = jsvector.get(); PRUint8 *row; for (int j = 0; j < h; j++) { row = surfaceData + surfaceDataOffset + (surfaceDataStride * j); for (int i = 0; i < w; i++) { // XXX Is there some useful swizzle MMX we can use here? // I guess we have to INT_TO_JSVAL still #ifdef IS_LITTLE_ENDIAN PRUint8 b = *row++; PRUint8 g = *row++; PRUint8 r = *row++; PRUint8 a = *row++; #else PRUint8 a = *row++; PRUint8 r = *row++; PRUint8 g = *row++; PRUint8 b = *row++; #endif // Convert to non-premultiplied color if (a != 0) { r = (r * 255) / a; g = (g * 255) / a; b = (b * 255) / a; } *dest++ = INT_TO_JSVAL(r); *dest++ = INT_TO_JSVAL(g); *dest++ = INT_TO_JSVAL(b); *dest++ = INT_TO_JSVAL(a); } } JSObject *dataArray = JS_NewArrayObject(ctx, w*h*4, jsvector.get()); if (!dataArray) return NS_ERROR_OUT_OF_MEMORY; nsAutoGCRoot arrayGCRoot(&dataArray, &rv); NS_ENSURE_SUCCESS(rv, rv); JSObject *result = JS_NewObject(ctx, NULL, NULL, NULL); if (!result) return NS_ERROR_OUT_OF_MEMORY; nsAutoGCRoot resultGCRoot(&result, &rv); NS_ENSURE_SUCCESS(rv, rv); if (!JS_DefineProperty(ctx, result, "width", INT_TO_JSVAL(w), NULL, NULL, 0) || !JS_DefineProperty(ctx, result, "height", INT_TO_JSVAL(h), NULL, NULL, 0) || !JS_DefineProperty(ctx, result, "data", OBJECT_TO_JSVAL(dataArray), NULL, NULL, 0)) return NS_ERROR_FAILURE; jsval *retvalPtr; ncc->GetRetValPtr(&retvalPtr); *retvalPtr = OBJECT_TO_JSVAL(result); ncc->SetReturnValueWasSet(PR_TRUE); return NS_OK; } // void putImageData (in ImageData d, in float x, in float y); NS_IMETHODIMP nsCanvasRenderingContext2D::PutImageData() { nsresult rv; if (!mValid) return NS_ERROR_FAILURE; nsAXPCNativeCallContext *ncc = nsnull; rv = nsContentUtils::XPConnect()-> GetCurrentNativeCallContext(&ncc); NS_ENSURE_SUCCESS(rv, rv); if (!ncc) return NS_ERROR_FAILURE; JSContext *ctx = nsnull; rv = ncc->GetJSContext(&ctx); NS_ENSURE_SUCCESS(rv, rv); PRUint32 argc; jsval *argv = nsnull; ncc->GetArgc(&argc); ncc->GetArgvPtr(&argv); JSAutoRequest ar(ctx); JSObject *dataObject; int32 x, y; if (!JS_ConvertArguments (ctx, argc, argv, "ojj", &dataObject, &x, &y)) return NS_ERROR_DOM_SYNTAX_ERR; if (!dataObject) return NS_ERROR_DOM_SYNTAX_ERR; int32 w, h; JSObject *dataArray; jsval v; if (!JS_GetProperty(ctx, dataObject, "width", &v) || !JS_ValueToInt32(ctx, v, &w)) return NS_ERROR_DOM_SYNTAX_ERR; if (!JS_GetProperty(ctx, dataObject, "height", &v) || !JS_ValueToInt32(ctx, v, &h)) return NS_ERROR_DOM_SYNTAX_ERR; if (!JS_GetProperty(ctx, dataObject, "data", &v) || !JSVAL_IS_OBJECT(v)) return NS_ERROR_DOM_SYNTAX_ERR; dataArray = JSVAL_TO_OBJECT(v); if (!CheckSaneSubrectSize (x, y, w, h, mWidth, mHeight)) return NS_ERROR_DOM_SYNTAX_ERR; jsuint arrayLen; if (!JS_IsArrayObject(ctx, dataArray) || !JS_GetArrayLength(ctx, dataArray, &arrayLen) || arrayLen < (jsuint)(w * h * 4)) return NS_ERROR_DOM_SYNTAX_ERR; nsAutoArrayPtr imageBuffer(new (std::nothrow) PRUint8[w * h * 4]); if (!imageBuffer) return NS_ERROR_OUT_OF_MEMORY; cairo_surface_t *imgsurf; PRUint8 *imgPtr = imageBuffer.get(); jsval vr, vg, vb, va; PRUint8 ir, ig, ib, ia; for (int32 j = 0; j < h; j++) { for (int32 i = 0; i < w; i++) { if (!JS_GetElement(ctx, dataArray, (j*w*4) + i*4 + 0, &vr) || !JS_GetElement(ctx, dataArray, (j*w*4) + i*4 + 1, &vg) || !JS_GetElement(ctx, dataArray, (j*w*4) + i*4 + 2, &vb) || !JS_GetElement(ctx, dataArray, (j*w*4) + i*4 + 3, &va)) return NS_ERROR_DOM_SYNTAX_ERR; if (JSVAL_IS_INT(vr)) ir = (PRUint8) JSVAL_TO_INT(vr); else if (JSVAL_IS_DOUBLE(vr)) ir = (PRUint8) (*JSVAL_TO_DOUBLE(vr)); else return NS_ERROR_DOM_SYNTAX_ERR; if (JSVAL_IS_INT(vg)) ig = (PRUint8) JSVAL_TO_INT(vg); else if (JSVAL_IS_DOUBLE(vg)) ig = (PRUint8) (*JSVAL_TO_DOUBLE(vg)); else return NS_ERROR_DOM_SYNTAX_ERR; if (JSVAL_IS_INT(vb)) ib = (PRUint8) JSVAL_TO_INT(vb); else if (JSVAL_IS_DOUBLE(vb)) ib = (PRUint8) (*JSVAL_TO_DOUBLE(vb)); else return NS_ERROR_DOM_SYNTAX_ERR; if (JSVAL_IS_INT(va)) ia = (PRUint8) JSVAL_TO_INT(va); else if (JSVAL_IS_DOUBLE(va)) ia = (PRUint8) (*JSVAL_TO_DOUBLE(va)); else return NS_ERROR_DOM_SYNTAX_ERR; // Convert to premultiplied color (losslessly if the input came from getImageData) ir = (ir*ia + 254) / 255; ig = (ig*ia + 254) / 255; ib = (ib*ia + 254) / 255; #ifdef IS_LITTLE_ENDIAN *imgPtr++ = ib; *imgPtr++ = ig; *imgPtr++ = ir; *imgPtr++ = ia; #else *imgPtr++ = ia; *imgPtr++ = ir; *imgPtr++ = ig; *imgPtr++ = ib; #endif } } imgsurf = cairo_image_surface_create_for_data (imageBuffer.get(), CAIRO_FORMAT_ARGB32, w, h, w*4); cairo_path_t *old_path = cairo_copy_path (mCairo); cairo_save (mCairo); cairo_identity_matrix (mCairo); cairo_translate (mCairo, x, y); cairo_new_path (mCairo); cairo_rectangle (mCairo, 0, 0, w, h); cairo_set_source_surface (mCairo, imgsurf, 0, 0); cairo_set_operator (mCairo, CAIRO_OPERATOR_SOURCE); cairo_fill (mCairo); cairo_restore (mCairo); cairo_new_path (mCairo); if (old_path->status == CAIRO_STATUS_SUCCESS && old_path->num_data != 0) cairo_append_path (mCairo, old_path); cairo_path_destroy (old_path); cairo_surface_destroy (imgsurf); return Redraw(); } NS_IMETHODIMP nsCanvasRenderingContext2D::GetThebesSurface(gfxASurface **surface) { if (!mThebesSurface) { *surface = nsnull; return NS_ERROR_NOT_AVAILABLE; } *surface = mThebesSurface.get(); NS_ADDREF(*surface); return NS_OK; }