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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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
/* utility functions for drawing borders and backgrounds */
#ifndef nsCSSRendering_h___
#define nsCSSRendering_h___
#include "gfxBlur.h"
#include "gfxContext.h"
#include "mozilla/gfx/PathHelpers.h"
#include "mozilla/gfx/Rect.h"
#include "mozilla/TypedEnumBits.h"
#include "nsStyleStruct.h"
#include "nsIFrame.h"
#include "nsImageRenderer.h"
#include "nsCSSRenderingBorders.h"
#include "gfxTextRun.h"
class gfxContext;
class nsPresContext;
namespace mozilla {
class ComputedStyle;
namespace gfx {
struct sRGBColor;
class DrawTarget;
} // namespace gfx
namespace layers {
class ImageContainer;
class StackingContextHelper;
class WebRenderParentCommand;
class WebRenderLayerManager;
class RenderRootStateManager;
} // namespace layers
namespace wr {
class DisplayListBuilder;
} // namespace wr
enum class PaintBorderFlags : uint8_t { SyncDecodeImages = 1 << 0 };
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(PaintBorderFlags)
} // namespace mozilla
/**
* A struct representing all the information needed to paint a background
* image to some target, taking into account all CSS background-* properties.
* See PrepareImageLayer.
*/
struct nsBackgroundLayerState {
typedef mozilla::gfx::CompositionOp CompositionOp;
typedef mozilla::nsImageRenderer nsImageRenderer;
/**
* @param aFlags some combination of nsCSSRendering::PAINTBG_* flags
*/
nsBackgroundLayerState(nsIFrame* aForFrame, const mozilla::StyleImage* aImage,
uint32_t aFlags)
: mImageRenderer(aForFrame, aImage, aFlags) {}
/**
* The nsImageRenderer that will be used to draw the background.
*/
nsImageRenderer mImageRenderer;
/**
* A rectangle that one copy of the image tile is mapped onto. Same
* coordinate system as aBorderArea/aBGClipRect passed into
* PrepareImageLayer.
*/
nsRect mDestArea;
/**
* The actual rectangle that should be filled with (complete or partial)
* image tiles. Same coordinate system as aBorderArea/aBGClipRect passed into
* PrepareImageLayer.
*/
nsRect mFillArea;
/**
* The anchor point that should be snapped to a pixel corner. Same
* coordinate system as aBorderArea/aBGClipRect passed into
* PrepareImageLayer.
*/
nsPoint mAnchor;
/**
* The background-repeat property space keyword computes the
* repeat size which is image size plus spacing.
*/
nsSize mRepeatSize;
};
struct nsCSSRendering {
typedef mozilla::gfx::sRGBColor sRGBColor;
typedef mozilla::gfx::CompositionOp CompositionOp;
typedef mozilla::gfx::DrawTarget DrawTarget;
typedef mozilla::gfx::Float Float;
typedef mozilla::gfx::Point Point;
typedef mozilla::gfx::Rect Rect;
typedef mozilla::gfx::Size Size;
typedef mozilla::gfx::RectCornerRadii RectCornerRadii;
typedef mozilla::layers::WebRenderLayerManager WebRenderLayerManager;
typedef mozilla::image::ImgDrawResult ImgDrawResult;
typedef nsIFrame::Sides Sides;
/**
* Initialize any static variables used by nsCSSRendering.
*/
static void Init();
/**
* Clean up any static variables used by nsCSSRendering.
*/
static void Shutdown();
static bool IsBoxDecorationSlice(const nsStyleBorder& aStyleBorder);
static nsRect BoxDecorationRectForBorder(
nsIFrame* aFrame, const nsRect& aBorderArea, Sides aSkipSides,
const nsStyleBorder* aStyleBorder = nullptr);
static nsRect BoxDecorationRectForBackground(
nsIFrame* aFrame, const nsRect& aBorderArea, Sides aSkipSides,
const nsStyleBorder* aStyleBorder = nullptr);
static bool GetShadowInnerRadii(nsIFrame* aFrame, const nsRect& aFrameArea,
RectCornerRadii& aOutInnerRadii);
static nsRect GetBoxShadowInnerPaddingRect(nsIFrame* aFrame,
const nsRect& aFrameArea);
static bool ShouldPaintBoxShadowInner(nsIFrame* aFrame);
static void PaintBoxShadowInner(nsPresContext* aPresContext,
gfxContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aFrameArea);
static bool GetBorderRadii(const nsRect& aFrameRect,
const nsRect& aBorderRect, nsIFrame* aFrame,
RectCornerRadii& aOutRadii);
static nsRect GetShadowRect(const nsRect& aFrameArea, bool aNativeTheme,
nsIFrame* aForFrame);
static mozilla::gfx::sRGBColor GetShadowColor(
const mozilla::StyleSimpleShadow&, nsIFrame* aFrame, float aOpacity);
// Returns if the frame has a themed frame.
// aMaybeHasBorderRadius will return false if we can early detect
// that we don't have a border radius.
static bool HasBoxShadowNativeTheme(nsIFrame* aFrame,
bool& aMaybeHasBorderRadius);
static void PaintBoxShadowOuter(nsPresContext* aPresContext,
gfxContext& aRenderingContext,
nsIFrame* aForFrame, const nsRect& aFrameArea,
const nsRect& aDirtyRect,
float aOpacity = 1.0);
static void ComputePixelRadii(const nscoord* aAppUnitsRadii,
nscoord aAppUnitsPerPixel,
RectCornerRadii* oBorderRadii);
/**
* Render the border for an element using css rendering rules
* for borders. aSkipSides says which sides to skip
* when rendering, the default is to skip none.
*/
static ImgDrawResult PaintBorder(
nsPresContext* aPresContext, gfxContext& aRenderingContext,
nsIFrame* aForFrame, const nsRect& aDirtyRect, const nsRect& aBorderArea,
mozilla::ComputedStyle* aStyle, mozilla::PaintBorderFlags aFlags,
Sides aSkipSides = Sides());
/**
* Like PaintBorder, but taking an nsStyleBorder argument instead of
* getting it from aStyle. aSkipSides says which sides to skip
* when rendering, the default is to skip none.
*/
static ImgDrawResult PaintBorderWithStyleBorder(
nsPresContext* aPresContext, gfxContext& aRenderingContext,
nsIFrame* aForFrame, const nsRect& aDirtyRect, const nsRect& aBorderArea,
const nsStyleBorder& aBorderStyle, mozilla::ComputedStyle* aStyle,
mozilla::PaintBorderFlags aFlags, Sides aSkipSides = Sides());
static mozilla::Maybe<nsCSSBorderRenderer> CreateBorderRenderer(
nsPresContext* aPresContext, DrawTarget* aDrawTarget, nsIFrame* aForFrame,
const nsRect& aDirtyRect, const nsRect& aBorderArea,
mozilla::ComputedStyle* aStyle, bool* aOutBorderIsEmpty,
Sides aSkipSides = Sides());
static mozilla::Maybe<nsCSSBorderRenderer>
CreateBorderRendererWithStyleBorder(
nsPresContext* aPresContext, DrawTarget* aDrawTarget, nsIFrame* aForFrame,
const nsRect& aDirtyRect, const nsRect& aBorderArea,
const nsStyleBorder& aBorderStyle, mozilla::ComputedStyle* aStyle,
bool* aOutBorderIsEmpty, Sides aSkipSides = Sides());
static mozilla::Maybe<nsCSSBorderRenderer>
CreateNullBorderRendererWithStyleBorder(
nsPresContext* aPresContext, DrawTarget* aDrawTarget, nsIFrame* aForFrame,
const nsRect& aDirtyRect, const nsRect& aBorderArea,
const nsStyleBorder& aBorderStyle, mozilla::ComputedStyle* aStyle,
bool* aOutBorderIsEmpty, Sides aSkipSides = Sides());
static mozilla::Maybe<nsCSSBorderRenderer>
CreateBorderRendererForNonThemedOutline(nsPresContext* aPresContext,
DrawTarget* aDrawTarget,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aInnerRect,
mozilla::ComputedStyle* aStyle);
static ImgDrawResult CreateWebRenderCommandsForBorder(
mozilla::nsDisplayItem* aItem, nsIFrame* aForFrame,
const nsRect& aBorderArea, mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const mozilla::layers::StackingContextHelper& aSc,
mozilla::layers::RenderRootStateManager* aManager,
mozilla::nsDisplayListBuilder* aDisplayListBuilder);
static void CreateWebRenderCommandsForNullBorder(
mozilla::nsDisplayItem* aItem, nsIFrame* aForFrame,
const nsRect& aBorderArea, mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const mozilla::layers::StackingContextHelper& aSc,
const nsStyleBorder& aStyleBorder);
static ImgDrawResult CreateWebRenderCommandsForBorderWithStyleBorder(
mozilla::nsDisplayItem* aItem, nsIFrame* aForFrame,
const nsRect& aBorderArea, mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const mozilla::layers::StackingContextHelper& aSc,
mozilla::layers::RenderRootStateManager* aManager,
mozilla::nsDisplayListBuilder* aDisplayListBuilder,
const nsStyleBorder& aStyleBorder);
/**
* Render the outline for an element using css rendering rules for borders.
*/
static void PaintNonThemedOutline(nsPresContext* aPresContext,
gfxContext& aRenderingContext,
nsIFrame* aForFrame,
const nsRect& aDirtyRect,
const nsRect& aInnerRect,
mozilla::ComputedStyle* aStyle);
/**
* 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, DrawTarget* aDrawTarget,
const nsRect& aFocusRect, nscolor aColor);
/**
* Render a gradient for an element.
* aDest is the rect for a single tile of the gradient on the destination.
* aFill is the rect on the destination to be covered by repeated tiling of
* the gradient.
* aSrc is the part of the gradient to be rendered into a tile (aDest), if
* aSrc and aDest are different sizes, the image will be scaled to map aSrc
* onto aDest.
* aIntrinsicSize is the size of the source gradient.
*/
static void PaintGradient(nsPresContext* aPresContext, gfxContext& aContext,
const mozilla::StyleGradient& aGradient,
const nsRect& aDirtyRect, const nsRect& aDest,
const nsRect& aFill, const nsSize& aRepeatSize,
const mozilla::CSSIntRect& aSrc,
const nsSize& aIntrinsiceSize,
float aOpacity = 1.0);
/**
* 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);
/**
* Returns the ComputedStyle to be used to paint the background for the given
* frame, if its element has a meaningful background. This applies the rules
* for propagating backgrounds between BODY, the root element, and the
* canvas.
*
* @return the ComputedStyle (if any) to be used for painting aForFrame's
* background.
*/
static mozilla::ComputedStyle* FindBackground(const nsIFrame* aForFrame);
static nsIFrame* FindBackgroundFrame(const nsIFrame* aForFrame);
/**
* 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 mozilla::ComputedStyle* FindRootFrameBackground(nsIFrame* aForFrame);
/**
* Find a non-transparent background color on an ancestor, for various
* contrast checks. Note that this only accounts for background-color and
* might stop at themed frames (depending on the argument), so it might not be
* what you want. Note that if we stop at themed frames we might, in fact, end
* up returning a transparent color (but then mIsThemed will be set to true).
*
* For semi-transparent colors, right now we blend with the default
* background-color rather than with all ancestor backgrounds.
*
* If aPreferBodyToCanvas is true, we prefer the background color of the
* <body> frame, even though we found a canvas background, because the body
* background color is most likely what will be visible as the background
* color of the page, even if the html element has a different background
* color which prevents that of the body frame to propagate to the viewport.
*/
struct EffectiveBackgroundColor {
nscolor mColor = 0;
bool mIsThemed = false;
};
static EffectiveBackgroundColor FindEffectiveBackgroundColor(
nsIFrame* aFrame, bool aStopAtThemed = true,
bool aPreferBodyToCanvas = false);
/**
* Determine the background color to draw taking into account print settings.
*/
static nscolor DetermineBackgroundColor(nsPresContext* aPresContext,
const mozilla::ComputedStyle* aStyle,
nsIFrame* aFrame,
bool& aDrawBackgroundImage,
bool& aDrawBackgroundColor);
static nsRect ComputeImageLayerPositioningArea(
nsPresContext* aPresContext, nsIFrame* aForFrame,
const nsRect& aBorderArea, const nsStyleImageLayers::Layer& aLayer,
nsIFrame** aAttachedToFrame, bool* aOutTransformedFixed);
// Implementation of the formula for computation of background-repeat round
// This function returns the adjusted size of the background image.
static nscoord ComputeRoundedSize(nscoord aCurrentSize,
nscoord aPositioningSize);
/* ComputeBorderSpacedRepeatSize
* aImageDimension: the image width/height
* aAvailableSpace: the background positioning area width/height
* aSpace: the space between each image
* Returns the image size plus gap size of app units for use as spacing
*/
static nscoord ComputeBorderSpacedRepeatSize(nscoord aImageDimension,
nscoord aAvailableSpace,
nscoord& aSpace);
static nsBackgroundLayerState PrepareImageLayer(
nsPresContext* aPresContext, nsIFrame* aForFrame, uint32_t aFlags,
const nsRect& aBorderArea, const nsRect& aBGClipRect,
const nsStyleImageLayers::Layer& aLayer,
bool* aOutIsTransformedFixed = nullptr);
struct ImageLayerClipState {
nsRect mBGClipArea; // Affected by mClippedRadii
nsRect mAdditionalBGClipArea; // Not affected by mClippedRadii
nsRect mDirtyRectInAppUnits;
gfxRect mDirtyRectInDevPx;
nscoord mRadii[8];
RectCornerRadii mClippedRadii;
bool mHasRoundedCorners;
bool mHasAdditionalBGClipArea;
// Whether we are being asked to draw with a caller provided background
// clipping area. If this is true we also disable rounded corners.
bool mCustomClip;
ImageLayerClipState()
: mHasRoundedCorners(false),
mHasAdditionalBGClipArea(false),
mCustomClip(false) {
memset(mRadii, 0, sizeof(nscoord) * 8);
}
bool IsValid() const;
};
static void GetImageLayerClip(const nsStyleImageLayers::Layer& aLayer,
nsIFrame* aForFrame,
const nsStyleBorder& aBorder,
const nsRect& aBorderArea,
const nsRect& aCallerDirtyRect,
bool aWillPaintBorder,
nscoord aAppUnitsPerPixel,
/* out */ ImageLayerClipState* aClipState);
/**
* Render the background for an element using css rendering rules
* for backgrounds or mask.
*/
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,
/**
* When this flag is passed, painting will read properties of mask-image
* style, instead of background-image.
*/
PAINTBG_MASK_IMAGE = 0x08,
/**
* When this flag is passed, images are downscaled during decode. This
* is also implied by PAINTBG_TO_WINDOW.
*/
PAINTBG_HIGH_QUALITY_SCALING = 0x10,
};
struct PaintBGParams {
nsPresContext& presCtx;
nsRect dirtyRect;
nsRect borderArea;
nsIFrame* frame;
uint32_t paintFlags;
nsRect* bgClipRect = nullptr;
int32_t layer; // -1 means painting all layers; other
// value means painting one specific
// layer only.
CompositionOp compositionOp;
float opacity;
static PaintBGParams ForAllLayers(nsPresContext& aPresCtx,
const nsRect& aDirtyRect,
const nsRect& aBorderArea,
nsIFrame* aFrame, uint32_t aPaintFlags,
float aOpacity = 1.0);
static PaintBGParams ForSingleLayer(
nsPresContext& aPresCtx, const nsRect& aDirtyRect,
const nsRect& aBorderArea, nsIFrame* aFrame, uint32_t aPaintFlags,
int32_t aLayer, CompositionOp aCompositionOp = CompositionOp::OP_OVER,
float aOpacity = 1.0);
private:
PaintBGParams(nsPresContext& aPresCtx, const nsRect& aDirtyRect,
const nsRect& aBorderArea, nsIFrame* aFrame,
uint32_t aPaintFlags, int32_t aLayer,
CompositionOp aCompositionOp, float aOpacity)
: presCtx(aPresCtx),
dirtyRect(aDirtyRect),
borderArea(aBorderArea),
frame(aFrame),
paintFlags(aPaintFlags),
layer(aLayer),
compositionOp(aCompositionOp),
opacity(aOpacity) {}
};
static ImgDrawResult PaintStyleImageLayer(const PaintBGParams& aParams,
gfxContext& aRenderingCtx);
/**
* Same as |PaintStyleImageLayer|, except using the provided style structs.
* This short-circuits the code that ensures that the root element's
* {background|mask} is drawn on the canvas.
* The aLayer parameter allows you to paint a single layer of the
* {background|mask}.
* The default value for aLayer, -1, means that all layers will be painted.
* The background color will only be painted if the back-most layer is also
* being painted and (aParams.paintFlags & PAINTBG_MASK_IMAGE) is false.
* aCompositionOp is only respected if a single layer is specified (aLayer !=
* -1). If all layers are painted, the image layer's blend mode (or the mask
* layer's composition mode) will be used.
*/
static ImgDrawResult PaintStyleImageLayerWithSC(
const PaintBGParams& aParams, gfxContext& aRenderingCtx,
const mozilla::ComputedStyle* aBackgroundSC,
const nsStyleBorder& aBorder);
static bool CanBuildWebRenderDisplayItemsForStyleImageLayer(
WebRenderLayerManager* aManager, nsPresContext& aPresCtx,
nsIFrame* aFrame, const nsStyleBackground* aBackgroundStyle,
int32_t aLayer, uint32_t aPaintFlags);
static ImgDrawResult BuildWebRenderDisplayItemsForStyleImageLayer(
const PaintBGParams& aParams, mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const mozilla::layers::StackingContextHelper& aSc,
mozilla::layers::RenderRootStateManager* aManager,
mozilla::nsDisplayItem* aItem);
static ImgDrawResult BuildWebRenderDisplayItemsForStyleImageLayerWithSC(
const PaintBGParams& aParams, mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const mozilla::layers::StackingContextHelper& aSc,
mozilla::layers::RenderRootStateManager* aManager,
mozilla::nsDisplayItem* aItem, mozilla::ComputedStyle* mBackgroundSC,
const nsStyleBorder& aBorder);
/**
* Returns the rectangle covered by the given background layer image, taking
* into account background positioning, sizing, and repetition, but not
* clipping.
*/
static nsRect GetBackgroundLayerRect(nsPresContext* aPresContext,
nsIFrame* aForFrame,
const nsRect& aBorderArea,
const nsRect& aClipRect,
const nsStyleImageLayers::Layer& aLayer,
uint32_t aFlags);
/**
* Called when we start creating a display list. The frame tree will not
* change until a matching EndFrameTreeLocked is called.
*/
static void BeginFrameTreesLocked();
/**
* Called when we've finished using a display list. When all
* BeginFrameTreeLocked calls have been balanced by an EndFrameTreeLocked,
* the frame tree may start changing again.
*/
static void EndFrameTreesLocked();
// Draw a border segment in the table collapsing border model with beveling
// corners.
static void DrawTableBorderSegment(
DrawTarget& aDrawTarget, mozilla::StyleBorderStyle aBorderStyle,
nscolor aBorderColor, const nsRect& aBorderRect,
int32_t aAppUnitsPerDevPixel, mozilla::Side aStartBevelSide,
nscoord aStartBevelOffset, mozilla::Side aEndBevelSide,
nscoord aEndBevelOffset);
// A single border bevel.
struct Bevel {
mozilla::Side mSide;
nscoord mOffset;
};
// A single solid beveled border segment.
struct SolidBeveledBorderSegment {
nsRect mRect;
nscolor mColor;
Bevel mStartBevel;
Bevel mEndBevel;
};
// Collect the table border segments with beveling. Can't be called with
// dashed / dotted borders, since we don't support beveling those.
static void GetTableBorderSolidSegments(
nsTArray<SolidBeveledBorderSegment>& aSegments,
mozilla::StyleBorderStyle aBorderStyle, nscolor aBorderColor,
const nsRect& aBorderRect, int32_t aAppUnitsPerDevPixel,
mozilla::Side aStartBevelSide, nscoord aStartBevelOffset,
mozilla::Side aEndBevelSide, nscoord aEndBevelOffset);
// NOTE: pt, dirtyRect, lineSize, ascent, offset in the following
// structs are non-rounded device pixels, not app units.
struct DecorationRectParams {
// The width [length] and the height [thickness] of the decoration
// line. This is a "logical" size in textRun orientation, so that
// for a vertical textrun, width will actually be a physical height;
// and conversely, height will be a physical width.
Size lineSize;
// The default height [thickness] of the line given by the font metrics.
// This is used for obtaining the correct offset for the decoration line
// when CSS specifies a unique thickness for a text-decoration,
// since the offset given by the font is derived from the font metric's
// assumed line height
Float defaultLineThickness = 0.0f;
// The ascent of the text.
Float ascent = 0.0f;
// The offset of the decoration line from the baseline of the text
// (if the value is positive, the line is lifted up).
Float offset = 0.0f;
// If descentLimit 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.
Float descentLimit = -1.0f;
// Which line will be painted. The value can be
// UNDERLINE or OVERLINE or LINE_THROUGH.
mozilla::StyleTextDecorationLine decoration =
mozilla::StyleTextDecorationLine::UNDERLINE;
// The style of the decoration line
mozilla::StyleTextDecorationStyle style =
mozilla::StyleTextDecorationStyle::None;
bool vertical = false;
bool sidewaysLeft = false;
gfxTextRun::Range glyphRange;
gfxTextRun::PropertyProvider* provider;
};
struct PaintDecorationLineParams : DecorationRectParams {
// No need to paint outside this rect.
Rect dirtyRect;
// The top/left edge of the text.
Point pt;
// The color of the decoration line.
nscolor color = NS_RGBA(0, 0, 0, 0);
// The distance between the left edge of the given frame and the
// position of the text as positioned without offset of the shadow.
Float icoordInFrame = 0.0f;
// Baseline offset being applied to this text (block-direction adjustment
// applied to glyph positions when computing skip-ink intercepts).
Float baselineOffset = 0.0f;
};
/**
* Function for painting the clipped decoration lines for the text.
* Takes into account the rect clipping that occurs when
* text-decoration-skip-ink is being used for underlines or overlines
*
* input:
* @param aFrame the frame which needs the decoration line
* @param aDrawTarget the target/backend being drawn to
* @param aParams the parameters for the decoration line
* being drawn
* @param aRect the rect representing the decoration line
*/
static void PaintDecorationLineInternal(
nsIFrame* aFrame, DrawTarget& aDrawTarget,
const PaintDecorationLineParams& aParams, Rect aRect);
/**
* Function for painting the decoration lines for the text.
*
* input:
* @param aFrame the frame which needs the decoration line
* @param aDrawTarget the target/backend being drawn to
* @param aParams the parameters for the decoration line
* being drawn
*/
static void PaintDecorationLine(nsIFrame* aFrame, DrawTarget& aDrawTarget,
const PaintDecorationLineParams& aParams);
/**
* Returns a Rect corresponding to the outline of the decoration line for the
* given text metrics. Arguments have the same meaning as for
* PaintDecorationLine. Currently this only works for solid
* decorations; for other decoration styles the returned Rect will be empty.
*/
static Rect DecorationLineToPath(const PaintDecorationLineParams& aParams);
/**
* 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
* output:
* @return the decoration line rect for the input,
* the each values are app units.
*/
static nsRect GetTextDecorationRect(nsPresContext* aPresContext,
const DecorationRectParams& aParams);
static CompositionOp GetGFXBlendMode(mozilla::StyleBlend aBlendMode) {
switch (aBlendMode) {
case mozilla::StyleBlend::Normal:
return CompositionOp::OP_OVER;
case mozilla::StyleBlend::Multiply:
return CompositionOp::OP_MULTIPLY;
case mozilla::StyleBlend::Screen:
return CompositionOp::OP_SCREEN;
case mozilla::StyleBlend::Overlay:
return CompositionOp::OP_OVERLAY;
case mozilla::StyleBlend::Darken:
return CompositionOp::OP_DARKEN;
case mozilla::StyleBlend::Lighten:
return CompositionOp::OP_LIGHTEN;
case mozilla::StyleBlend::ColorDodge:
return CompositionOp::OP_COLOR_DODGE;
case mozilla::StyleBlend::ColorBurn:
return CompositionOp::OP_COLOR_BURN;
case mozilla::StyleBlend::HardLight:
return CompositionOp::OP_HARD_LIGHT;
case mozilla::StyleBlend::SoftLight:
return CompositionOp::OP_SOFT_LIGHT;
case mozilla::StyleBlend::Difference:
return CompositionOp::OP_DIFFERENCE;
case mozilla::StyleBlend::Exclusion:
return CompositionOp::OP_EXCLUSION;
case mozilla::StyleBlend::Hue:
return CompositionOp::OP_HUE;
case mozilla::StyleBlend::Saturation:
return CompositionOp::OP_SATURATION;
case mozilla::StyleBlend::Color:
return CompositionOp::OP_COLOR;
case mozilla::StyleBlend::Luminosity:
return CompositionOp::OP_LUMINOSITY;
case mozilla::StyleBlend::PlusLighter:
return CompositionOp::OP_ADD;
default:
MOZ_ASSERT(false);
return CompositionOp::OP_OVER;
}
}
static CompositionOp GetGFXCompositeMode(
mozilla::StyleMaskComposite aCompositeMode) {
switch (aCompositeMode) {
case mozilla::StyleMaskComposite::Add:
return CompositionOp::OP_OVER;
case mozilla::StyleMaskComposite::Subtract:
return CompositionOp::OP_OUT;
case mozilla::StyleMaskComposite::Intersect:
return CompositionOp::OP_IN;
case mozilla::StyleMaskComposite::Exclude:
return CompositionOp::OP_XOR;
default:
MOZ_ASSERT(false);
return CompositionOp::OP_OVER;
}
}
protected:
static gfxRect GetTextDecorationRectInternal(
const Point& aPt, const DecorationRectParams& aParams);
/**
* Returns inflated rect for painting a decoration line.
* Complex style decoration lines should be painted from leftmost of nearest
* ancestor block box because that makes better look of connection of lines
* for different nodes. ExpandPaintingRectForDecorationLine() returns
* a rect for actual painting rect for the clipped rect.
*
* input:
* @param aFrame the frame which needs the decoration line.
* @param aStyle the style of the complex decoration line
* @param aClippedRect the clipped rect for the decoration line.
* in other words, visible area of the line.
* @param aICoordInFrame the distance between inline-start edge of aFrame
* and aClippedRect.pos.
* @param aCycleLength the width of one cycle of the line style.
*/
static Rect ExpandPaintingRectForDecorationLine(
nsIFrame* aFrame, const mozilla::StyleTextDecorationStyle aStyle,
const Rect& aClippedRect, const Float aICoordInFrame,
const Float aCycleLength, bool aVertical);
};
/*
* 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 {
typedef mozilla::gfx::sRGBColor sRGBColor;
typedef mozilla::gfx::DrawTarget DrawTarget;
typedef mozilla::gfx::RectCornerRadii RectCornerRadii;
public:
enum { FORCE_MASK = 0x01, DISABLE_HARDWARE_ACCELERATION_BLUR = 0x02 };
/**
* 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, int32_t aAppUnitsPerDevPixel,
gfxContext* aDestinationCtx, const nsRect& aDirtyRect,
const gfxRect* aSkipRect, uint32_t aFlags = 0);
/**
* 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,
int32_t aAppUnitsPerDevPixel);
/**
* Blurs a coloured rectangle onto aDestinationCtx. This is equivalent
* to calling Init(), drawing a rectangle onto the returned surface
* and then calling DoPaint, but may let us optimize better in the
* backend.
*
* @param aDestinationCtx The destination to blur to.
* @param aRect The rectangle to blur 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 aCornerRadii Corner radii for aRect, if it is a rounded
* rectangle.
* @param aBlurRadius The blur radius in app units.
* @param aShadowColor The color to draw the blurred shadow.
* @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.
*/
static void BlurRectangle(gfxContext* aDestinationCtx, const nsRect& aRect,
int32_t aAppUnitsPerDevPixel,
RectCornerRadii* aCornerRadii, nscoord aBlurRadius,
const sRGBColor& aShadowColor,
const nsRect& aDirtyRect, const gfxRect& aSkipRect);
/**
* Draws a blurred inset box shadow shape onto the destination surface.
* Like BlurRectangle, this is equivalent to calling Init(),
* drawing a rectangle onto the returned surface
* and then calling DoPaint, but may let us optimize better in the
* backend.
*
* @param aDestinationCtx The destination to blur to.
* @param aDestinationRect The rectangle to blur in app units.
* @param aShadowClipRect The inside clip rect that creates the path.
* @param aShadowColor The color of the blur
* @param aBlurRadiusAppUnits The blur radius in app units
* @param aSpreadRadiusAppUnits The spread 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 aHasBorderRadius If this inset box blur has a border radius
* @param aInnerClipRectRadii The clip rect radii used for the inside rect's
* path.
* @param aSkipRect An area in device pixels (NOT app units!) to
* avoid blurring over, to prevent unnecessary work.
*/
bool InsetBoxBlur(gfxContext* aDestinationCtx,
mozilla::gfx::Rect aDestinationRect,
mozilla::gfx::Rect aShadowClipRect,
mozilla::gfx::sRGBColor& aShadowColor,
nscoord aBlurRadiusAppUnits, nscoord aSpreadRadiusAppUnits,
int32_t aAppUnitsPerDevPixel, bool aHasBorderRadius,
RectCornerRadii& aInnerClipRectRadii,
mozilla::gfx::Rect aSkipRect,
mozilla::gfx::Point aShadowOffset);
protected:
static void GetBlurAndSpreadRadius(DrawTarget* aDestDrawTarget,
int32_t aAppUnitsPerDevPixel,
nscoord aBlurRadius, nscoord aSpreadRadius,
mozilla::gfx::IntSize& aOutBlurRadius,
mozilla::gfx::IntSize& aOutSpreadRadius,
bool aConstrainSpreadRadius = true);
gfxAlphaBoxBlur mAlphaBoxBlur;
mozilla::UniquePtr<gfxContext> mOwnedContext;
gfxContext* mContext; // may be either mOwnedContext or mDestinationContext
gfxContext* mDestinationCtx;
/* This is true if the blur already has it's content transformed
* by mDestinationCtx's transform */
bool mPreTransformed;
};
#endif /* nsCSSRendering_h___ */