/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ // Main header first: #include "nsSVGMaskFrame.h" // Keep others in (case-insensitive) order: #include "gfxContext.h" #include "gfxImageSurface.h" #include "nsRenderingContext.h" #include "nsSVGEffects.h" #include "mozilla/dom/SVGMaskElement.h" using namespace mozilla::dom; /** * Byte offsets of channels in a native packed gfxColor or cairo image surface. */ #ifdef IS_BIG_ENDIAN #define GFX_ARGB32_OFFSET_A 0 #define GFX_ARGB32_OFFSET_R 1 #define GFX_ARGB32_OFFSET_G 2 #define GFX_ARGB32_OFFSET_B 3 #else #define GFX_ARGB32_OFFSET_A 3 #define GFX_ARGB32_OFFSET_R 2 #define GFX_ARGB32_OFFSET_G 1 #define GFX_ARGB32_OFFSET_B 0 #endif // c = n / 255 // c <= 0.04045 ? c / 12.92 : pow((c + 0.055) / 1.055, 2.4)) * 255 + 0.5 static const uint8_t gsRGBToLinearRGBMap[256] = { 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 8, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 12, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16, 17, 17, 17, 18, 18, 19, 19, 20, 20, 21, 22, 22, 23, 23, 24, 24, 25, 25, 26, 27, 27, 28, 29, 29, 30, 30, 31, 32, 32, 33, 34, 35, 35, 36, 37, 37, 38, 39, 40, 41, 41, 42, 43, 44, 45, 45, 46, 47, 48, 49, 50, 51, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 76, 77, 78, 79, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 95, 96, 97, 99, 100, 101, 103, 104, 105, 107, 108, 109, 111, 112, 114, 115, 116, 118, 119, 121, 122, 124, 125, 127, 128, 130, 131, 133, 134, 136, 138, 139, 141, 142, 144, 146, 147, 149, 151, 152, 154, 156, 157, 159, 161, 163, 164, 166, 168, 170, 171, 173, 175, 177, 179, 181, 183, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220, 222, 224, 226, 229, 231, 233, 235, 237, 239, 242, 244, 246, 248, 250, 253, 255 }; static void ComputesRGBLuminanceMask(uint8_t *aData, int32_t aStride, const nsIntRect &aRect, float aOpacity) { for (int32_t y = aRect.y; y < aRect.YMost(); y++) { for (int32_t x = aRect.x; x < aRect.XMost(); x++) { uint8_t *pixel = aData + aStride * y + 4 * x; uint8_t a = pixel[GFX_ARGB32_OFFSET_A]; uint8_t luminance; if (a) { /* sRGB -> intensity (unpremultiply cancels out the * (a/255.0) multiplication with aOpacity */ luminance = static_cast ((pixel[GFX_ARGB32_OFFSET_R] * 0.2125 + pixel[GFX_ARGB32_OFFSET_G] * 0.7154 + pixel[GFX_ARGB32_OFFSET_B] * 0.0721) * aOpacity); } else { luminance = 0; } memset(pixel, luminance, 4); } } } static void ComputeLinearRGBLuminanceMask(uint8_t *aData, int32_t aStride, const nsIntRect &aRect, float aOpacity) { for (int32_t y = aRect.y; y < aRect.YMost(); y++) { for (int32_t x = aRect.x; x < aRect.XMost(); x++) { uint8_t *pixel = aData + aStride * y + 4 * x; uint8_t a = pixel[GFX_ARGB32_OFFSET_A]; uint8_t luminance; // unpremultiply if (a) { if (a != 255) { pixel[GFX_ARGB32_OFFSET_B] = (255 * pixel[GFX_ARGB32_OFFSET_B]) / a; pixel[GFX_ARGB32_OFFSET_G] = (255 * pixel[GFX_ARGB32_OFFSET_G]) / a; pixel[GFX_ARGB32_OFFSET_R] = (255 * pixel[GFX_ARGB32_OFFSET_R]) / a; } /* sRGB -> linearRGB -> intensity */ luminance = static_cast ((gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_R]] * 0.2125 + gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_G]] * 0.7154 + gsRGBToLinearRGBMap[pixel[GFX_ARGB32_OFFSET_B]] * 0.0721) * (a / 255.0) * aOpacity); } else { luminance = 0; } memset(pixel, luminance, 4); } } } static void ComputeAlphaMask(uint8_t *aData, int32_t aStride, const nsIntRect &aRect, float aOpacity) { for (int32_t y = aRect.y; y < aRect.YMost(); y++) { for (int32_t x = aRect.x; x < aRect.XMost(); x++) { uint8_t *pixel = aData + aStride * y + 4 * x; uint8_t luminance = pixel[GFX_ARGB32_OFFSET_A] * aOpacity; memset(pixel, luminance, 4); } } } //---------------------------------------------------------------------- // Implementation nsIFrame* NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext) { return new (aPresShell) nsSVGMaskFrame(aContext); } NS_IMPL_FRAMEARENA_HELPERS(nsSVGMaskFrame) already_AddRefed nsSVGMaskFrame::ComputeMaskAlpha(nsRenderingContext *aContext, nsIFrame* aParent, const gfxMatrix &aMatrix, float aOpacity) { // If the flag is set when we get here, it means this mask frame // has already been used painting the current mask, and the document // has a mask reference loop. if (mInUse) { NS_WARNING("Mask loop detected!"); return nullptr; } AutoMaskReferencer maskRef(this); SVGMaskElement *mask = static_cast(mContent); uint16_t units = mask->mEnumAttributes[SVGMaskElement::MASKUNITS].GetAnimValue(); gfxRect bbox; if (units == SVG_UNIT_TYPE_OBJECTBOUNDINGBOX) { bbox = nsSVGUtils::GetBBox(aParent); } gfxRect maskArea = nsSVGUtils::GetRelativeRect(units, &mask->mLengthAttributes[SVGMaskElement::ATTR_X], bbox, aParent); gfxContext *gfx = aContext->ThebesContext(); // Get the clip extents in device space: gfx->Save(); nsSVGUtils::SetClipRect(gfx, aMatrix, maskArea); gfx->IdentityMatrix(); gfxRect clipExtents = gfx->GetClipExtents(); clipExtents.RoundOut(); gfx->Restore(); bool resultOverflows; gfxIntSize surfaceSize = nsSVGUtils::ConvertToSurfaceSize(gfxSize(clipExtents.Width(), clipExtents.Height()), &resultOverflows); // 0 disables mask, < 0 is an error if (surfaceSize.width <= 0 || surfaceSize.height <= 0) return nullptr; if (resultOverflows) return nullptr; nsRefPtr image = new gfxImageSurface(surfaceSize, gfxImageFormat::ARGB32); if (!image || image->CairoStatus()) return nullptr; // We would like to use gfxImageSurface::SetDeviceOffset() to position // 'image'. However, we need to set the same matrix on the temporary context // and pattern that we create below as is currently set on 'gfx'. // Unfortunately, any device offset set by SetDeviceOffset() is affected by // the transform passed to the SetMatrix() calls, so to avoid that we account // for the device offset in the transform rather than use SetDeviceOffset(). gfxMatrix matrix = gfx->CurrentMatrix() * gfxMatrix().Translate(-clipExtents.TopLeft()); nsRenderingContext tmpCtx; tmpCtx.Init(this->PresContext()->DeviceContext(), image); tmpCtx.ThebesContext()->SetMatrix(matrix); mMaskParent = aParent; if (mMaskParentMatrix) { *mMaskParentMatrix = aMatrix; } else { mMaskParentMatrix = new gfxMatrix(aMatrix); } for (nsIFrame* kid = mFrames.FirstChild(); kid; kid = kid->GetNextSibling()) { // The CTM of each frame referencing us can be different nsISVGChildFrame* SVGFrame = do_QueryFrame(kid); if (SVGFrame) { SVGFrame->NotifySVGChanged(nsISVGChildFrame::TRANSFORM_CHANGED); } nsSVGUtils::PaintFrameWithEffects(&tmpCtx, nullptr, kid); } uint8_t *data = image->Data(); int32_t stride = image->Stride(); nsIntRect rect(0, 0, surfaceSize.width, surfaceSize.height); if (StyleSVGReset()->mMaskType == NS_STYLE_MASK_TYPE_LUMINANCE) { if (StyleSVG()->mColorInterpolation == NS_STYLE_COLOR_INTERPOLATION_LINEARRGB) { ComputeLinearRGBLuminanceMask(data, stride, rect, aOpacity); } else { ComputesRGBLuminanceMask(data, stride, rect, aOpacity); } } else { ComputeAlphaMask(data, stride, rect, aOpacity); } nsRefPtr retval = new gfxPattern(image); retval->SetMatrix(matrix); return retval.forget(); } NS_IMETHODIMP nsSVGMaskFrame::AttributeChanged(int32_t aNameSpaceID, nsIAtom* aAttribute, int32_t aModType) { if (aNameSpaceID == kNameSpaceID_None && (aAttribute == nsGkAtoms::x || aAttribute == nsGkAtoms::y || aAttribute == nsGkAtoms::width || aAttribute == nsGkAtoms::height|| aAttribute == nsGkAtoms::maskUnits || aAttribute == nsGkAtoms::maskContentUnits)) { nsSVGEffects::InvalidateDirectRenderingObservers(this); } return nsSVGMaskFrameBase::AttributeChanged(aNameSpaceID, aAttribute, aModType); } #ifdef DEBUG void nsSVGMaskFrame::Init(nsIContent* aContent, nsIFrame* aParent, nsIFrame* aPrevInFlow) { NS_ASSERTION(aContent->IsSVG(nsGkAtoms::mask), "Content is not an SVG mask"); nsSVGMaskFrameBase::Init(aContent, aParent, aPrevInFlow); } #endif /* DEBUG */ nsIAtom * nsSVGMaskFrame::GetType() const { return nsGkAtoms::svgMaskFrame; } gfxMatrix nsSVGMaskFrame::GetCanvasTM(uint32_t aFor, nsIFrame* aTransformRoot) { NS_ASSERTION(mMaskParentMatrix, "null parent matrix"); SVGMaskElement *mask = static_cast(mContent); return nsSVGUtils::AdjustMatrixForUnits( mMaskParentMatrix ? *mMaskParentMatrix : gfxMatrix(), &mask->mEnumAttributes[SVGMaskElement::MASKCONTENTUNITS], mMaskParent); }