mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
synced 2024-09-13 09:24:08 -07:00
490 lines
22 KiB
C++
490 lines
22 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* ***** 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
|
|
* Netscape Communications Corporation.
|
|
* Portions created by the Initial Developer are Copyright (C) 1998
|
|
* the Initial Developer. All Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*
|
|
* Alternatively, the contents of this file may be used under the terms of
|
|
* either of 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 ***** */
|
|
|
|
/* utility functions for drawing borders and backgrounds */
|
|
|
|
#ifndef nsCSSRendering_h___
|
|
#define nsCSSRendering_h___
|
|
|
|
#include "nsIRenderingContext.h"
|
|
#include "nsStyleConsts.h"
|
|
#include "gfxBlur.h"
|
|
#include "gfxContext.h"
|
|
#include "gfxImageSurface.h"
|
|
|
|
struct nsPoint;
|
|
class nsStyleContext;
|
|
class nsPresContext;
|
|
|
|
struct nsCSSRendering {
|
|
/**
|
|
* Initialize any static variables used by nsCSSRendering.
|
|
*/
|
|
static nsresult Init();
|
|
|
|
/**
|
|
* Clean up any static variables used by nsCSSRendering.
|
|
*/
|
|
static void Shutdown();
|
|
|
|
static void PaintBoxShadowInner(nsPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
nsIFrame* aForFrame,
|
|
const nsRect& aFrameArea,
|
|
const nsRect& aDirtyRect);
|
|
|
|
static void PaintBoxShadowOuter(nsPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
nsIFrame* aForFrame,
|
|
const nsRect& aFrameArea,
|
|
const nsRect& aDirtyRect);
|
|
|
|
static void ComputePixelRadii(const nscoord *aAppUnitsRadii,
|
|
nscoord aAppUnitsPerPixel,
|
|
gfxCornerSizes *oBorderRadii);
|
|
|
|
/**
|
|
* Render the border for an element using css rendering rules
|
|
* for borders. aSkipSides is a bitmask of the sides to skip
|
|
* when rendering. If 0 then no sides are skipped.
|
|
*/
|
|
static void PaintBorder(nsPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
nsIFrame* aForFrame,
|
|
const nsRect& aDirtyRect,
|
|
const nsRect& aBorderArea,
|
|
nsStyleContext* aStyleContext,
|
|
PRIntn aSkipSides = 0);
|
|
|
|
/**
|
|
* Like PaintBorder, but taking an nsStyleBorder argument instead of
|
|
* getting it from aStyleContext.
|
|
*/
|
|
static void PaintBorderWithStyleBorder(nsPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
nsIFrame* aForFrame,
|
|
const nsRect& aDirtyRect,
|
|
const nsRect& aBorderArea,
|
|
const nsStyleBorder& aBorderStyle,
|
|
nsStyleContext* aStyleContext,
|
|
PRIntn aSkipSides = 0);
|
|
|
|
|
|
/**
|
|
* Render the outline for an element using css rendering rules
|
|
* for borders. aSkipSides is a bitmask of the sides to skip
|
|
* when rendering. If 0 then no sides are skipped.
|
|
*/
|
|
static void PaintOutline(nsPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
nsIFrame* aForFrame,
|
|
const nsRect& aDirtyRect,
|
|
const nsRect& aBorderArea,
|
|
nsStyleContext* aStyleContext);
|
|
|
|
/**
|
|
* Render keyboard focus on an element.
|
|
* |aFocusRect| is the outer rectangle of the focused element.
|
|
* Uses a fixed style equivalent to "1px dotted |aColor|".
|
|
* Not used for controls, because the native theme may differ.
|
|
*/
|
|
static void PaintFocus(nsPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
const nsRect& aFocusRect,
|
|
nscolor aColor);
|
|
|
|
/**
|
|
* Render a gradient for an element.
|
|
*/
|
|
static void PaintGradient(nsPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
nsStyleGradient* aGradient,
|
|
const nsRect& aDirtyRect,
|
|
const nsRect& aOneCellArea,
|
|
const nsRect& aFillArea);
|
|
|
|
/**
|
|
* Find the frame whose background style should be used to draw the
|
|
* canvas background. aForFrame must be the frame for the root element
|
|
* whose background style should be used. This function will return
|
|
* aForFrame unless the <body> background should be propagated, in
|
|
* which case we return the frame associated with the <body>'s background.
|
|
*/
|
|
static nsIFrame* FindBackgroundStyleFrame(nsIFrame* aForFrame);
|
|
|
|
/**
|
|
* @return PR_TRUE if |aFrame| is a canvas frame, in the CSS sense.
|
|
*/
|
|
static PRBool IsCanvasFrame(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Fill in an aBackgroundSC to be used to paint the background
|
|
* for an element. This applies the rules for propagating
|
|
* backgrounds between BODY, the root element, and the canvas.
|
|
* @return PR_TRUE if there is some meaningful background.
|
|
*/
|
|
static PRBool FindBackground(nsPresContext* aPresContext,
|
|
nsIFrame* aForFrame,
|
|
nsStyleContext** aBackgroundSC);
|
|
|
|
/**
|
|
* As FindBackground, but the passed-in frame is known to be a root frame
|
|
* (returned from nsCSSFrameConstructor::GetRootElementStyleFrame())
|
|
* and there is always some meaningful background returned.
|
|
*/
|
|
static nsStyleContext* FindRootFrameBackground(nsIFrame* aForFrame);
|
|
|
|
/**
|
|
* Returns background style information for the canvas.
|
|
*
|
|
* @param aForFrame
|
|
* the frame used to represent the canvas, in the CSS sense (i.e.
|
|
* nsCSSRendering::IsCanvasFrame(aForFrame) must be true)
|
|
* @param aRootElementFrame
|
|
* the frame representing the root element of the document
|
|
* @param aBackground
|
|
* contains background style information for the canvas on return
|
|
*/
|
|
static nsStyleContext*
|
|
FindCanvasBackground(nsIFrame* aForFrame, nsIFrame* aRootElementFrame)
|
|
{
|
|
NS_ABORT_IF_FALSE(IsCanvasFrame(aForFrame), "not a canvas frame");
|
|
if (aRootElementFrame)
|
|
return FindRootFrameBackground(aRootElementFrame);
|
|
|
|
// This should always give transparent, so we'll fill it in with the
|
|
// default color if needed. This seems to happen a bit while a page is
|
|
// being loaded.
|
|
return aForFrame->GetStyleContext();
|
|
}
|
|
|
|
/**
|
|
* Find a frame which draws a non-transparent background,
|
|
* for various table-related and HR-related backwards-compatibility hacks.
|
|
* This function will also stop if it finds themed frame which might draw
|
|
* background.
|
|
*
|
|
* Be very hesitant if you're considering calling this function -- it's
|
|
* usually not what you want.
|
|
*/
|
|
static nsIFrame*
|
|
FindNonTransparentBackgroundFrame(nsIFrame* aFrame,
|
|
PRBool aStartAtParent = PR_FALSE);
|
|
|
|
/**
|
|
* Determine the background color to draw taking into account print settings.
|
|
*/
|
|
static nscolor
|
|
DetermineBackgroundColor(nsPresContext* aPresContext,
|
|
nsStyleContext* aStyleContext,
|
|
nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Render the background for an element using css rendering rules
|
|
* for backgrounds.
|
|
*/
|
|
enum {
|
|
/**
|
|
* When this flag is passed, the element's nsDisplayBorder will be
|
|
* painted immediately on top of this background.
|
|
*/
|
|
PAINTBG_WILL_PAINT_BORDER = 0x01,
|
|
/**
|
|
* When this flag is passed, images are synchronously decoded.
|
|
*/
|
|
PAINTBG_SYNC_DECODE_IMAGES = 0x02,
|
|
/**
|
|
* When this flag is passed, painting will go to the screen so we can
|
|
* take advantage of the fact that it will be clipped to the viewport.
|
|
*/
|
|
PAINTBG_TO_WINDOW = 0x04
|
|
};
|
|
static void PaintBackground(nsPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
nsIFrame* aForFrame,
|
|
const nsRect& aDirtyRect,
|
|
const nsRect& aBorderArea,
|
|
PRUint32 aFlags,
|
|
nsRect* aBGClipRect = nsnull);
|
|
|
|
/**
|
|
* Same as |PaintBackground|, except using the provided style structs.
|
|
* This short-circuits the code that ensures that the root element's
|
|
* background is drawn on the canvas.
|
|
*/
|
|
static void PaintBackgroundWithSC(nsPresContext* aPresContext,
|
|
nsIRenderingContext& aRenderingContext,
|
|
nsIFrame* aForFrame,
|
|
const nsRect& aDirtyRect,
|
|
const nsRect& aBorderArea,
|
|
nsStyleContext *aStyleContext,
|
|
const nsStyleBorder& aBorder,
|
|
PRUint32 aFlags,
|
|
nsRect* aBGClipRect = nsnull);
|
|
|
|
/**
|
|
* Called by the presShell when painting is finished, so we can clear our
|
|
* inline background data cache.
|
|
*/
|
|
static void DidPaint();
|
|
|
|
// Draw a border segment in the table collapsing border model without
|
|
// beveling corners
|
|
static void DrawTableBorderSegment(nsIRenderingContext& aContext,
|
|
PRUint8 aBorderStyle,
|
|
nscolor aBorderColor,
|
|
const nsStyleBackground* aBGColor,
|
|
const nsRect& aBorderRect,
|
|
PRInt32 aAppUnitsPerCSSPixel,
|
|
PRUint8 aStartBevelSide = 0,
|
|
nscoord aStartBevelOffset = 0,
|
|
PRUint8 aEndBevelSide = 0,
|
|
nscoord aEndBevelOffset = 0);
|
|
|
|
enum {
|
|
DECORATION_STYLE_NONE = 0,
|
|
DECORATION_STYLE_SOLID = 1,
|
|
DECORATION_STYLE_DOTTED = 2,
|
|
DECORATION_STYLE_DASHED = 3,
|
|
DECORATION_STYLE_DOUBLE = 4,
|
|
DECORATION_STYLE_WAVY = 5
|
|
};
|
|
|
|
/**
|
|
* Function for painting the decoration lines for the text.
|
|
* NOTE: aPt, aLineSize, aAscent and aOffset are non-rounded device pixels,
|
|
* not app units.
|
|
* input:
|
|
* @param aGfxContext
|
|
* @param aColor the color of the decoration line
|
|
* @param aPt the top/left edge of the text
|
|
* @param aLineSize the width and the height of the decoration
|
|
* line
|
|
* @param aAscent the ascent of the text
|
|
* @param aOffset the offset of the decoration line from
|
|
* the baseline of the text (if the value is
|
|
* positive, the line is lifted up)
|
|
* @param aDecoration which line will be painted. The value can be
|
|
* NS_STYLE_TEXT_DECORATION_UNDERLINE or
|
|
* NS_STYLE_TEXT_DECORATION_OVERLINE or
|
|
* NS_STYLE_TEXT_DECORATION_LINE_THROUGH.
|
|
* @param aStyle the style of the decoration line (See above
|
|
* enum names).
|
|
* @param aDescentLimit If aDescentLimit is zero or larger and the
|
|
* underline overflows from the descent space,
|
|
* the underline should be lifted up as far as
|
|
* possible. Note that this does not mean the
|
|
* underline never overflows from this
|
|
* limitation. Because if the underline is
|
|
* positioned to the baseline or upper, it causes
|
|
* unreadability. Note that if this is zero
|
|
* or larger, the underline rect may be shrunken
|
|
* if it's possible. Therefore, this value is
|
|
* used for strikeout line and overline too.
|
|
*/
|
|
static void PaintDecorationLine(gfxContext* aGfxContext,
|
|
const nscolor aColor,
|
|
const gfxPoint& aPt,
|
|
const gfxSize& aLineSize,
|
|
const gfxFloat aAscent,
|
|
const gfxFloat aOffset,
|
|
const PRUint8 aDecoration,
|
|
const PRUint8 aStyle,
|
|
const gfxFloat aDescentLimit = -1.0);
|
|
|
|
/**
|
|
* Function for getting the decoration line rect for the text.
|
|
* NOTE: aLineSize, aAscent and aOffset are non-rounded device pixels,
|
|
* not app units.
|
|
* input:
|
|
* @param aPresContext
|
|
* @param aLineSize the width and the height of the decoration
|
|
* line
|
|
* @param aAscent the ascent of the text
|
|
* @param aOffset the offset of the decoration line from
|
|
* the baseline of the text (if the value is
|
|
* positive, the line is lifted up)
|
|
* @param aDecoration which line will be painted. The value can be
|
|
* NS_STYLE_TEXT_DECORATION_UNDERLINE or
|
|
* NS_STYLE_TEXT_DECORATION_OVERLINE or
|
|
* NS_STYLE_TEXT_DECORATION_LINE_THROUGH.
|
|
* @param aStyle the style of the decoration line (See above
|
|
* enum names).
|
|
* @param aDescentLimit If aDescentLimit is zero or larger and the
|
|
* underline overflows from the descent space,
|
|
* the underline should be lifted up as far as
|
|
* possible. Note that this does not mean the
|
|
* underline never overflows from this
|
|
* limitation. Because if the underline is
|
|
* positioned to the baseline or upper, it causes
|
|
* unreadability. Note that if this is zero
|
|
* or larger, the underline rect may be shrunken
|
|
* if it's possible. Therefore, this value is
|
|
* used for strikeout line and overline too.
|
|
* output:
|
|
* @return the decoration line rect for the input,
|
|
* the each values are app units.
|
|
*/
|
|
static nsRect GetTextDecorationRect(nsPresContext* aPresContext,
|
|
const gfxSize& aLineSize,
|
|
const gfxFloat aAscent,
|
|
const gfxFloat aOffset,
|
|
const PRUint8 aDecoration,
|
|
const PRUint8 aStyle,
|
|
const gfxFloat aDescentLimit = -1.0);
|
|
|
|
protected:
|
|
static gfxRect GetTextDecorationRectInternal(const gfxPoint& aPt,
|
|
const gfxSize& aLineSize,
|
|
const gfxFloat aAscent,
|
|
const gfxFloat aOffset,
|
|
const PRUint8 aDecoration,
|
|
const PRUint8 aStyle,
|
|
const gfxFloat aDscentLimit);
|
|
};
|
|
|
|
/*
|
|
* nsContextBoxBlur
|
|
* Creates an 8-bit alpha channel context for callers to draw in, blurs the
|
|
* contents of that context and applies it as a 1-color mask on a
|
|
* different existing context. Uses gfxAlphaBoxBlur as its back end.
|
|
*
|
|
* You must call Init() first to create a suitable temporary surface to draw
|
|
* on. You must then draw any desired content onto the given context, then
|
|
* call DoPaint() to apply the blurred content as a single-color mask. You
|
|
* can only call Init() once, so objects cannot be reused.
|
|
*
|
|
* This is very useful for creating drop shadows or silhouettes.
|
|
*/
|
|
class nsContextBoxBlur {
|
|
public:
|
|
enum {
|
|
FORCE_MASK = 0x01
|
|
};
|
|
/**
|
|
* Prepares a gfxContext to draw on. Do not call this twice; if you want
|
|
* to get the gfxContext again use GetContext().
|
|
*
|
|
* @param aRect The coordinates of the surface to create.
|
|
* All coordinates must be in app units.
|
|
* This must not include the blur radius, pass
|
|
* it as the second parameter and everything
|
|
* is taken care of.
|
|
*
|
|
* @param aBlurRadius The blur radius in app units.
|
|
*
|
|
* @param aAppUnitsPerDevPixel The number of app units in a device pixel,
|
|
* for conversion. Most of the time you'll
|
|
* pass this from the current PresContext if
|
|
* available.
|
|
*
|
|
* @param aDestinationCtx The graphics context to apply the blurred
|
|
* mask to when you call DoPaint(). Make sure
|
|
* it is not destroyed before you call
|
|
* DoPaint(). To set the color of the
|
|
* resulting blurred graphic mask, you must
|
|
* set the color on this context before
|
|
* calling Init().
|
|
*
|
|
* @param aDirtyRect The absolute dirty rect in app units. Used to
|
|
* optimize the temporary surface size and speed up blur.
|
|
*
|
|
* @param aSkipRect An area in device pixels (NOT app units!) to avoid
|
|
* blurring over, to prevent unnecessary work.
|
|
*
|
|
* @param aFlags FORCE_MASK to ensure that the content drawn to the
|
|
* returned gfxContext is used as a mask, and not
|
|
* drawn directly to aDestinationCtx.
|
|
*
|
|
* @return A blank 8-bit alpha-channel-only graphics context to
|
|
* draw on, or null on error. Must not be freed. The
|
|
* context has a device offset applied to it given by
|
|
* aRect. This means you can use coordinates as if it
|
|
* were at the desired position at aRect and you don't
|
|
* need to worry about translating any coordinates to
|
|
* draw on this temporary surface.
|
|
*
|
|
* If aBlurRadius is 0, the returned context is aDestinationCtx and
|
|
* DoPaint() does nothing, because no blurring is required. Therefore, you
|
|
* should prepare the destination context as if you were going to draw
|
|
* directly on it instead of any temporary surface created in this class.
|
|
*/
|
|
gfxContext* Init(const nsRect& aRect, nscoord aSpreadRadius,
|
|
nscoord aBlurRadius,
|
|
PRInt32 aAppUnitsPerDevPixel, gfxContext* aDestinationCtx,
|
|
const nsRect& aDirtyRect, const gfxRect* aSkipRect,
|
|
PRUint32 aFlags = 0);
|
|
|
|
/**
|
|
* Does the actual blurring/spreading. Users of this object *must*
|
|
* have called Init() first, then have drawn whatever they want to be
|
|
* blurred onto the internal gfxContext before calling this.
|
|
*/
|
|
void DoEffects();
|
|
|
|
/**
|
|
* Does the actual blurring and mask applying. Users of this object *must*
|
|
* have called Init() first, then have drawn whatever they want to be
|
|
* blurred onto the internal gfxContext before calling this.
|
|
*/
|
|
void DoPaint();
|
|
|
|
/**
|
|
* Gets the internal gfxContext at any time. Must not be freed. Avoid
|
|
* calling this before calling Init() since the context would not be
|
|
* constructed at that point.
|
|
*/
|
|
gfxContext* GetContext();
|
|
|
|
|
|
/**
|
|
* Get the margin associated with the given blur radius, i.e., the
|
|
* additional area that might be painted as a result of it. (The
|
|
* margin for a spread radius is itself, on all sides.)
|
|
*/
|
|
static nsMargin GetBlurRadiusMargin(nscoord aBlurRadius,
|
|
PRInt32 aAppUnitsPerDevPixel);
|
|
|
|
protected:
|
|
gfxAlphaBoxBlur blur;
|
|
nsRefPtr<gfxContext> mContext;
|
|
gfxContext* mDestinationCtx;
|
|
|
|
};
|
|
|
|
#endif /* nsCSSRendering_h___ */
|