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gecko-dev/gfx/2d/DrawTargetCairo.cpp

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/* -*- Mode: C++; tab-width: 20; 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/. */
#include "DrawTargetCairo.h"
#include "SourceSurfaceCairo.h"
#include "PathCairo.h"
#include "HelpersCairo.h"
#include "ScaledFontBase.h"
#include "cairo.h"
#include "cairo-tee.h"
#include <string.h>
#include "Blur.h"
#include "Logging.h"
#include "Tools.h"
#ifdef CAIRO_HAS_QUARTZ_SURFACE
#include "cairo-quartz.h"
#include <ApplicationServices/ApplicationServices.h>
#endif
#ifdef CAIRO_HAS_XLIB_SURFACE
#include "cairo-xlib.h"
#endif
#include <algorithm>
namespace mozilla {
namespace gfx {
namespace {
// An RAII class to prepare to draw a context and optional path. Saves and
// restores the context on construction/destruction.
class AutoPrepareForDrawing
{
public:
AutoPrepareForDrawing(DrawTargetCairo* dt, cairo_t* ctx)
: mCtx(ctx)
{
dt->PrepareForDrawing(ctx);
cairo_save(mCtx);
MOZ_ASSERT(cairo_status(mCtx) || dt->GetTransform() == GetTransform());
}
AutoPrepareForDrawing(DrawTargetCairo* dt, cairo_t* ctx, const Path* path)
: mCtx(ctx)
{
dt->PrepareForDrawing(ctx, path);
cairo_save(mCtx);
MOZ_ASSERT(cairo_status(mCtx) || dt->GetTransform() == GetTransform());
}
~AutoPrepareForDrawing() { cairo_restore(mCtx); }
private:
#ifdef DEBUG
Matrix GetTransform()
{
cairo_matrix_t mat;
cairo_get_matrix(mCtx, &mat);
return Matrix(mat.xx, mat.yx, mat.xy, mat.yy, mat.x0, mat.y0);
}
#endif
cairo_t* mCtx;
};
} // end anonymous namespace
static bool
GetCairoSurfaceSize(cairo_surface_t* surface, IntSize& size)
{
switch (cairo_surface_get_type(surface))
{
case CAIRO_SURFACE_TYPE_IMAGE:
{
size.width = cairo_image_surface_get_width(surface);
size.height = cairo_image_surface_get_height(surface);
return true;
}
#ifdef CAIRO_HAS_XLIB_SURFACE
case CAIRO_SURFACE_TYPE_XLIB:
{
size.width = cairo_xlib_surface_get_width(surface);
size.height = cairo_xlib_surface_get_height(surface);
return true;
}
#endif
#ifdef CAIRO_HAS_QUARTZ_SURFACE
case CAIRO_SURFACE_TYPE_QUARTZ:
{
CGContextRef cgc = cairo_quartz_surface_get_cg_context(surface);
// It's valid to call these CGBitmapContext functions on non-bitmap
// contexts; they'll just return 0 in that case.
size.width = CGBitmapContextGetWidth(cgc);
size.height = CGBitmapContextGetWidth(cgc);
return true;
}
#endif
default:
return false;
}
}
static bool
PatternIsCompatible(const Pattern& aPattern)
{
switch (aPattern.GetType())
{
case PATTERN_LINEAR_GRADIENT:
{
const LinearGradientPattern& pattern = static_cast<const LinearGradientPattern&>(aPattern);
return pattern.mStops->GetBackendType() == BACKEND_CAIRO;
}
case PATTERN_RADIAL_GRADIENT:
{
const RadialGradientPattern& pattern = static_cast<const RadialGradientPattern&>(aPattern);
return pattern.mStops->GetBackendType() == BACKEND_CAIRO;
}
default:
return true;
}
}
static cairo_user_data_key_t surfaceDataKey;
void
ReleaseData(void* aData)
{
static_cast<DataSourceSurface*>(aData)->Release();
}
/**
* Returns cairo surface for the given SourceSurface.
* If possible, it will use the cairo_surface associated with aSurface,
* otherwise, it will create a new cairo_surface.
* In either case, the caller must call cairo_surface_destroy on the
* result when it is done with it.
*/
cairo_surface_t*
GetCairoSurfaceForSourceSurface(SourceSurface *aSurface)
{
if (aSurface->GetType() == SURFACE_CAIRO) {
cairo_surface_t* surf = static_cast<SourceSurfaceCairo*>(aSurface)->GetSurface();
cairo_surface_reference(surf);
return surf;
}
if (aSurface->GetType() == SURFACE_CAIRO_IMAGE) {
cairo_surface_t* surf =
static_cast<const DataSourceSurfaceCairo*>(aSurface)->GetSurface();
cairo_surface_reference(surf);
return surf;
}
RefPtr<DataSourceSurface> data = aSurface->GetDataSurface();
if (!data) {
return nullptr;
}
cairo_surface_t* surf =
cairo_image_surface_create_for_data(data->GetData(),
GfxFormatToCairoFormat(data->GetFormat()),
data->GetSize().width,
data->GetSize().height,
data->Stride());
// In certain scenarios, requesting larger than 8k image fails. Bug 803568
// covers the details of how to run into it, but the full detailed
// investigation hasn't been done to determine the underlying cause. We
// will just handle the failure to allocate the surface to avoid a crash.
if (cairo_surface_status(surf)) {
return nullptr;
}
cairo_surface_set_user_data(surf,
&surfaceDataKey,
data.forget().drop(),
ReleaseData);
return surf;
}
// Never returns nullptr. As such, you must always pass in Cairo-compatible
// patterns, most notably gradients with a GradientStopCairo.
// The pattern returned must have cairo_pattern_destroy() called on it by the
// caller.
// As the cairo_pattern_t returned may depend on the Pattern passed in, the
// lifetime of the cairo_pattern_t returned must not exceed the lifetime of the
// Pattern passed in.
static cairo_pattern_t*
GfxPatternToCairoPattern(const Pattern& aPattern, Float aAlpha)
{
cairo_pattern_t* pat;
switch (aPattern.GetType())
{
case PATTERN_COLOR:
{
Color color = static_cast<const ColorPattern&>(aPattern).mColor;
pat = cairo_pattern_create_rgba(color.r, color.g, color.b, color.a * aAlpha);
break;
}
case PATTERN_SURFACE:
{
const SurfacePattern& pattern = static_cast<const SurfacePattern&>(aPattern);
cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(pattern.mSurface);
pat = cairo_pattern_create_for_surface(surf);
// The pattern matrix is a matrix that transforms the pattern into user
// space. Cairo takes a matrix that converts from user space to pattern
// space. Cairo therefore needs the inverse.
cairo_matrix_t mat;
GfxMatrixToCairoMatrix(pattern.mMatrix, mat);
cairo_matrix_invert(&mat);
cairo_pattern_set_matrix(pat, &mat);
cairo_pattern_set_filter(pat, GfxFilterToCairoFilter(pattern.mFilter));
cairo_pattern_set_extend(pat, GfxExtendToCairoExtend(pattern.mExtendMode));
cairo_surface_destroy(surf);
break;
}
case PATTERN_LINEAR_GRADIENT:
{
const LinearGradientPattern& pattern = static_cast<const LinearGradientPattern&>(aPattern);
pat = cairo_pattern_create_linear(pattern.mBegin.x, pattern.mBegin.y,
pattern.mEnd.x, pattern.mEnd.y);
MOZ_ASSERT(pattern.mStops->GetBackendType() == BACKEND_CAIRO);
GradientStopsCairo* cairoStops = static_cast<GradientStopsCairo*>(pattern.mStops.get());
cairo_pattern_set_extend(pat, GfxExtendToCairoExtend(cairoStops->GetExtendMode()));
const std::vector<GradientStop>& stops = cairoStops->GetStops();
for (size_t i = 0; i < stops.size(); ++i) {
const GradientStop& stop = stops[i];
cairo_pattern_add_color_stop_rgba(pat, stop.offset, stop.color.r,
stop.color.g, stop.color.b,
stop.color.a);
}
break;
}
case PATTERN_RADIAL_GRADIENT:
{
const RadialGradientPattern& pattern = static_cast<const RadialGradientPattern&>(aPattern);
pat = cairo_pattern_create_radial(pattern.mCenter1.x, pattern.mCenter1.y, pattern.mRadius1,
pattern.mCenter2.x, pattern.mCenter2.y, pattern.mRadius2);
MOZ_ASSERT(pattern.mStops->GetBackendType() == BACKEND_CAIRO);
GradientStopsCairo* cairoStops = static_cast<GradientStopsCairo*>(pattern.mStops.get());
cairo_pattern_set_extend(pat, GfxExtendToCairoExtend(cairoStops->GetExtendMode()));
const std::vector<GradientStop>& stops = cairoStops->GetStops();
for (size_t i = 0; i < stops.size(); ++i) {
const GradientStop& stop = stops[i];
cairo_pattern_add_color_stop_rgba(pat, stop.offset, stop.color.r,
stop.color.g, stop.color.b,
stop.color.a);
}
break;
}
default:
{
// We should support all pattern types!
MOZ_ASSERT(false);
}
}
return pat;
}
static bool
NeedIntermediateSurface(const Pattern& aPattern, const DrawOptions& aOptions)
{
// We pre-multiply colours' alpha by the global alpha, so we don't need to
// use an intermediate surface for them.
if (aPattern.GetType() == PATTERN_COLOR)
return false;
if (aOptions.mAlpha == 1.0)
return false;
return true;
}
DrawTargetCairo::DrawTargetCairo()
: mContext(nullptr)
, mPathObserver(nullptr)
{
}
DrawTargetCairo::~DrawTargetCairo()
{
MarkSnapshotIndependent();
if (mPathObserver) {
mPathObserver->ForgetDrawTarget();
}
cairo_destroy(mContext);
if (mSurface) {
cairo_surface_destroy(mSurface);
}
}
IntSize
DrawTargetCairo::GetSize()
{
return mSize;
}
TemporaryRef<SourceSurface>
DrawTargetCairo::Snapshot()
{
if (mSnapshot) {
return mSnapshot;
}
IntSize size = GetSize();
cairo_content_t content = cairo_surface_get_content(mSurface);
mSnapshot = new SourceSurfaceCairo(mSurface,
size,
CairoContentToGfxFormat(content),
this);
return mSnapshot;
}
void
DrawTargetCairo::Flush()
{
cairo_surface_t* surf = cairo_get_target(mContext);
cairo_surface_flush(surf);
}
void
DrawTargetCairo::PrepareForDrawing(cairo_t* aContext, const Path* aPath /* = nullptr */)
{
WillChange(aPath);
}
void
DrawTargetCairo::DrawSurface(SourceSurface *aSurface,
const Rect &aDest,
const Rect &aSource,
const DrawSurfaceOptions &aSurfOptions,
const DrawOptions &aOptions)
{
AutoPrepareForDrawing prep(this, mContext);
float sx = aSource.Width() / aDest.Width();
float sy = aSource.Height() / aDest.Height();
cairo_matrix_t src_mat;
cairo_matrix_init_translate(&src_mat, aSource.X(), aSource.Y());
cairo_matrix_scale(&src_mat, sx, sy);
cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(aSurface);
cairo_pattern_t* pat = cairo_pattern_create_for_surface(surf);
cairo_surface_destroy(surf);
cairo_pattern_set_matrix(pat, &src_mat);
cairo_pattern_set_filter(pat, GfxFilterToCairoFilter(aSurfOptions.mFilter));
cairo_pattern_set_extend(pat, CAIRO_EXTEND_PAD);
cairo_translate(mContext, aDest.X(), aDest.Y());
if (IsOperatorBoundByMask(aOptions.mCompositionOp)) {
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, aDest.Width(), aDest.Height());
cairo_clip(mContext);
cairo_set_source(mContext, pat);
} else {
cairo_push_group(mContext);
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, aDest.Width(), aDest.Height());
cairo_set_source(mContext, pat);
cairo_fill(mContext);
cairo_pop_group_to_source(mContext);
}
cairo_set_operator(mContext, GfxOpToCairoOp(aOptions.mCompositionOp));
cairo_paint_with_alpha(mContext, aOptions.mAlpha);
cairo_pattern_destroy(pat);
}
void
DrawTargetCairo::DrawSurfaceWithShadow(SourceSurface *aSurface,
const Point &aDest,
const Color &aColor,
const Point &aOffset,
Float aSigma,
CompositionOp aOperator)
{
if (aSurface->GetType() != SURFACE_CAIRO) {
return;
}
Float width = Float(aSurface->GetSize().width);
Float height = Float(aSurface->GetSize().height);
SourceSurfaceCairo* source = static_cast<SourceSurfaceCairo*>(aSurface);
cairo_surface_t* sourcesurf = source->GetSurface();
cairo_surface_t* blursurf;
cairo_surface_t* surf;
// We only use the A8 surface for blurred shadows. Unblurred shadows can just
// use the RGBA surface directly.
if (cairo_surface_get_type(sourcesurf) == CAIRO_SURFACE_TYPE_TEE) {
blursurf = cairo_tee_surface_index(sourcesurf, 0);
surf = cairo_tee_surface_index(sourcesurf, 1);
MOZ_ASSERT(cairo_surface_get_type(blursurf) == CAIRO_SURFACE_TYPE_IMAGE);
Rect extents(0, 0, width, height);
AlphaBoxBlur blur(extents,
cairo_image_surface_get_stride(blursurf),
aSigma);
blur.Blur(cairo_image_surface_get_data(blursurf));
} else {
blursurf = sourcesurf;
surf = sourcesurf;
}
WillChange();
ClearSurfaceForUnboundedSource(aOperator);
cairo_save(mContext);
cairo_set_operator(mContext, GfxOpToCairoOp(aOperator));
cairo_identity_matrix(mContext);
cairo_translate(mContext, aDest.x, aDest.y);
if (IsOperatorBoundByMask(aOperator)){
cairo_set_source_rgba(mContext, aColor.r, aColor.g, aColor.b, aColor.a);
cairo_mask_surface(mContext, blursurf, aOffset.x, aOffset.y);
// Now that the shadow has been drawn, we can draw the surface on top.
cairo_set_source_surface(mContext, surf, 0, 0);
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, width, height);
cairo_fill(mContext);
} else {
cairo_push_group(mContext);
cairo_set_source_rgba(mContext, aColor.r, aColor.g, aColor.b, aColor.a);
cairo_mask_surface(mContext, blursurf, aOffset.x, aOffset.y);
// Now that the shadow has been drawn, we can draw the surface on top.
cairo_set_source_surface(mContext, surf, 0, 0);
cairo_new_path(mContext);
cairo_rectangle(mContext, 0, 0, width, height);
cairo_fill(mContext);
cairo_pop_group_to_source(mContext);
cairo_paint(mContext);
}
cairo_restore(mContext);
}
void
DrawTargetCairo::DrawPattern(const Pattern& aPattern,
const StrokeOptions& aStrokeOptions,
const DrawOptions& aOptions,
DrawPatternType aDrawType)
{
if (!PatternIsCompatible(aPattern)) {
return;
}
cairo_pattern_t* pat = GfxPatternToCairoPattern(aPattern, aOptions.mAlpha);
cairo_set_source(mContext, pat);
if (NeedIntermediateSurface(aPattern, aOptions) ||
!IsOperatorBoundByMask(aOptions.mCompositionOp)) {
cairo_push_group_with_content(mContext, CAIRO_CONTENT_COLOR_ALPHA);
ClearSurfaceForUnboundedSource(aOptions.mCompositionOp);
// Don't want operators to be applied twice
cairo_set_operator(mContext, CAIRO_OPERATOR_OVER);
if (aDrawType == DRAW_STROKE) {
SetCairoStrokeOptions(mContext, aStrokeOptions);
cairo_stroke_preserve(mContext);
} else {
cairo_fill_preserve(mContext);
}
cairo_pop_group_to_source(mContext);
// Now draw the content using the desired operator
cairo_set_operator(mContext, GfxOpToCairoOp(aOptions.mCompositionOp));
cairo_paint_with_alpha(mContext, aOptions.mAlpha);
} else {
ClearSurfaceForUnboundedSource(aOptions.mCompositionOp);
cairo_set_operator(mContext, GfxOpToCairoOp(aOptions.mCompositionOp));
if (aDrawType == DRAW_STROKE) {
SetCairoStrokeOptions(mContext, aStrokeOptions);
cairo_stroke_preserve(mContext);
} else {
cairo_fill_preserve(mContext);
}
}
cairo_pattern_destroy(pat);
}
void
DrawTargetCairo::FillRect(const Rect &aRect,
const Pattern &aPattern,
const DrawOptions &aOptions)
{
AutoPrepareForDrawing prep(this, mContext);
cairo_new_path(mContext);
cairo_rectangle(mContext, aRect.x, aRect.y, aRect.Width(), aRect.Height());
DrawPattern(aPattern, StrokeOptions(), aOptions, DRAW_FILL);
}
void
DrawTargetCairo::CopySurface(SourceSurface *aSurface,
const IntRect &aSource,
const IntPoint &aDest)
{
AutoPrepareForDrawing prep(this, mContext);
if (!aSurface || aSurface->GetType() != SURFACE_CAIRO) {
gfxWarning() << "Unsupported surface type specified";
return;
}
cairo_surface_t* surf = static_cast<SourceSurfaceCairo*>(aSurface)->GetSurface();
cairo_identity_matrix(mContext);
cairo_set_source_surface(mContext, surf, aDest.x - aSource.x, aDest.y - aSource.y);
cairo_set_operator(mContext, CAIRO_OPERATOR_SOURCE);
cairo_reset_clip(mContext);
cairo_new_path(mContext);
cairo_rectangle(mContext, aDest.x, aDest.y, aSource.width, aSource.height);
cairo_fill(mContext);
}
void
DrawTargetCairo::ClearRect(const Rect& aRect)
{
AutoPrepareForDrawing prep(this, mContext);
cairo_new_path(mContext);
cairo_set_operator(mContext, CAIRO_OPERATOR_CLEAR);
cairo_rectangle(mContext, aRect.X(), aRect.Y(),
aRect.Width(), aRect.Height());
cairo_fill(mContext);
}
void
DrawTargetCairo::StrokeRect(const Rect &aRect,
const Pattern &aPattern,
const StrokeOptions &aStrokeOptions /* = StrokeOptions() */,
const DrawOptions &aOptions /* = DrawOptions() */)
{
AutoPrepareForDrawing prep(this, mContext);
cairo_new_path(mContext);
cairo_rectangle(mContext, aRect.x, aRect.y, aRect.Width(), aRect.Height());
DrawPattern(aPattern, aStrokeOptions, aOptions, DRAW_STROKE);
}
void
DrawTargetCairo::StrokeLine(const Point &aStart,
const Point &aEnd,
const Pattern &aPattern,
const StrokeOptions &aStrokeOptions /* = StrokeOptions() */,
const DrawOptions &aOptions /* = DrawOptions() */)
{
AutoPrepareForDrawing prep(this, mContext);
cairo_new_path(mContext);
cairo_move_to(mContext, aStart.x, aStart.y);
cairo_line_to(mContext, aEnd.x, aEnd.y);
DrawPattern(aPattern, aStrokeOptions, aOptions, DRAW_STROKE);
}
void
DrawTargetCairo::Stroke(const Path *aPath,
const Pattern &aPattern,
const StrokeOptions &aStrokeOptions /* = StrokeOptions() */,
const DrawOptions &aOptions /* = DrawOptions() */)
{
AutoPrepareForDrawing prep(this, mContext, aPath);
if (aPath->GetBackendType() != BACKEND_CAIRO)
return;
PathCairo* path = const_cast<PathCairo*>(static_cast<const PathCairo*>(aPath));
path->CopyPathTo(mContext, this);
DrawPattern(aPattern, aStrokeOptions, aOptions, DRAW_STROKE);
}
void
DrawTargetCairo::Fill(const Path *aPath,
const Pattern &aPattern,
const DrawOptions &aOptions /* = DrawOptions() */)
{
AutoPrepareForDrawing prep(this, mContext, aPath);
if (aPath->GetBackendType() != BACKEND_CAIRO)
return;
PathCairo* path = const_cast<PathCairo*>(static_cast<const PathCairo*>(aPath));
path->CopyPathTo(mContext, this);
DrawPattern(aPattern, StrokeOptions(), aOptions, DRAW_FILL);
}
void
DrawTargetCairo::FillGlyphs(ScaledFont *aFont,
const GlyphBuffer &aBuffer,
const Pattern &aPattern,
const DrawOptions &aOptions,
const GlyphRenderingOptions*)
{
AutoPrepareForDrawing prep(this, mContext);
ScaledFontBase* scaledFont = static_cast<ScaledFontBase*>(aFont);
cairo_set_scaled_font(mContext, scaledFont->GetCairoScaledFont());
cairo_pattern_t* pat = GfxPatternToCairoPattern(aPattern, aOptions.mAlpha);
cairo_set_source(mContext, pat);
cairo_pattern_destroy(pat);
// Convert our GlyphBuffer into an array of Cairo glyphs.
std::vector<cairo_glyph_t> glyphs(aBuffer.mNumGlyphs);
for (uint32_t i = 0; i < aBuffer.mNumGlyphs; ++i) {
glyphs[i].index = aBuffer.mGlyphs[i].mIndex;
glyphs[i].x = aBuffer.mGlyphs[i].mPosition.x;
glyphs[i].y = aBuffer.mGlyphs[i].mPosition.y;
}
cairo_show_glyphs(mContext, &glyphs[0], aBuffer.mNumGlyphs);
}
void
DrawTargetCairo::Mask(const Pattern &aSource,
const Pattern &aMask,
const DrawOptions &aOptions /* = DrawOptions() */)
{
AutoPrepareForDrawing prep(this, mContext);
cairo_pattern_t* source = GfxPatternToCairoPattern(aSource, aOptions.mAlpha);
cairo_set_source(mContext, source);
cairo_pattern_t* mask = GfxPatternToCairoPattern(aMask, aOptions.mAlpha);
cairo_mask(mContext, mask);
cairo_pattern_destroy(mask);
cairo_pattern_destroy(source);
}
void
DrawTargetCairo::MaskSurface(const Pattern &aSource,
SourceSurface *aMask,
Point aOffset,
const DrawOptions &aOptions)
{
AutoPrepareForDrawing prep(this, mContext);
if (!PatternIsCompatible(aSource)) {
return;
}
cairo_pattern_t* pat = GfxPatternToCairoPattern(aSource, aOptions.mAlpha);
cairo_set_source(mContext, pat);
if (NeedIntermediateSurface(aSource, aOptions)) {
cairo_push_group_with_content(mContext, CAIRO_CONTENT_COLOR_ALPHA);
// Don't want operators to be applied twice
cairo_set_operator(mContext, CAIRO_OPERATOR_OVER);
// Now draw the content using the desired operator
cairo_paint_with_alpha(mContext, aOptions.mAlpha);
cairo_pop_group_to_source(mContext);
}
cairo_surface_t* surf = GetCairoSurfaceForSourceSurface(aMask);
cairo_pattern_t* mask = cairo_pattern_create_for_surface(surf);
cairo_matrix_t matrix;
cairo_matrix_init_translate (&matrix, -aOffset.x, -aOffset.y);
cairo_pattern_set_matrix (mask, &matrix);
cairo_mask(mContext, mask);
cairo_surface_destroy(surf);
cairo_pattern_destroy(mask);
cairo_pattern_destroy(pat);
}
void
DrawTargetCairo::PushClip(const Path *aPath)
{
if (aPath->GetBackendType() != BACKEND_CAIRO) {
return;
}
WillChange(aPath);
cairo_save(mContext);
PathCairo* path = const_cast<PathCairo*>(static_cast<const PathCairo*>(aPath));
path->CopyPathTo(mContext, this);
cairo_clip_preserve(mContext);
}
void
DrawTargetCairo::PushClipRect(const Rect& aRect)
{
WillChange();
cairo_save(mContext);
cairo_new_path(mContext);
cairo_rectangle(mContext, aRect.X(), aRect.Y(), aRect.Width(), aRect.Height());
cairo_clip_preserve(mContext);
}
void
DrawTargetCairo::PopClip()
{
// save/restore does not affect the path, so no need to call WillChange()
cairo_restore(mContext);
}
TemporaryRef<PathBuilder>
DrawTargetCairo::CreatePathBuilder(FillRule aFillRule /* = FILL_WINDING */) const
{
RefPtr<PathBuilderCairo> builder = new PathBuilderCairo(mContext,
const_cast<DrawTargetCairo*>(this),
aFillRule);
return builder;
}
void
DrawTargetCairo::ClearSurfaceForUnboundedSource(const CompositionOp &aOperator)
{
if (aOperator != OP_SOURCE)
return;
cairo_set_operator(mContext, CAIRO_OPERATOR_CLEAR);
// It doesn't really matter what the source is here, since Paint
// isn't bounded by the source and the mask covers the entire clip
// region.
cairo_paint(mContext);
}
TemporaryRef<GradientStops>
DrawTargetCairo::CreateGradientStops(GradientStop *aStops, uint32_t aNumStops,
ExtendMode aExtendMode) const
{
RefPtr<GradientStopsCairo> stops = new GradientStopsCairo(aStops, aNumStops,
aExtendMode);
return stops;
}
/**
* Copies pixel data from aData into aSurface; aData must have the dimensions
* given in aSize, with a stride of aStride bytes and aPixelWidth bytes per pixel
*/
static void
CopyDataToCairoSurface(cairo_surface_t* aSurface,
unsigned char *aData,
const IntSize &aSize,
int32_t aStride,
int32_t aPixelWidth)
{
unsigned char* surfData = cairo_image_surface_get_data(aSurface);
// In certain scenarios, requesting larger than 8k image fails. Bug 803568
// covers the details of how to run into it, but the full detailed
// investigation hasn't been done to determine the underlying cause. We
// will just handle the failure to allocate the surface to avoid a crash.
if (!surfData) {
return;
}
for (int32_t y = 0; y < aSize.height; ++y) {
memcpy(surfData + y * aSize.width * aPixelWidth,
aData + y * aStride,
aSize.width * aPixelWidth);
}
cairo_surface_mark_dirty(aSurface);
}
TemporaryRef<SourceSurface>
DrawTargetCairo::CreateSourceSurfaceFromData(unsigned char *aData,
const IntSize &aSize,
int32_t aStride,
SurfaceFormat aFormat) const
{
cairo_surface_t* surf = cairo_image_surface_create(GfxFormatToCairoFormat(aFormat),
aSize.width,
aSize.height);
// In certain scenarios, requesting larger than 8k image fails. Bug 803568
// covers the details of how to run into it, but the full detailed
// investigation hasn't been done to determine the underlying cause. We
// will just handle the failure to allocate the surface to avoid a crash.
if (cairo_surface_status(surf)) {
return nullptr;
}
CopyDataToCairoSurface(surf, aData, aSize, aStride, BytesPerPixel(aFormat));
RefPtr<SourceSurfaceCairo> source_surf = new SourceSurfaceCairo(surf, aSize, aFormat);
cairo_surface_destroy(surf);
return source_surf;
}
TemporaryRef<SourceSurface>
DrawTargetCairo::OptimizeSourceSurface(SourceSurface *aSurface) const
{
return aSurface;
}
TemporaryRef<SourceSurface>
DrawTargetCairo::CreateSourceSurfaceFromNativeSurface(const NativeSurface &aSurface) const
{
if (aSurface.mType == NATIVE_SURFACE_CAIRO_SURFACE) {
IntSize size;
cairo_surface_t* surf = static_cast<cairo_surface_t*>(aSurface.mSurface);
if (GetCairoSurfaceSize(surf, size)) {
RefPtr<SourceSurfaceCairo> source =
new SourceSurfaceCairo(surf, size, aSurface.mFormat);
return source;
}
}
return nullptr;
}
TemporaryRef<DrawTarget>
DrawTargetCairo::CreateSimilarDrawTarget(const IntSize &aSize, SurfaceFormat aFormat) const
{
cairo_surface_t* similar = cairo_surface_create_similar(cairo_get_target(mContext),
GfxFormatToCairoContent(aFormat),
aSize.width, aSize.height);
if (!cairo_surface_status(similar)) {
RefPtr<DrawTargetCairo> target = new DrawTargetCairo();
target->InitAlreadyReferenced(similar, aSize);
return target;
}
return nullptr;
}
bool
DrawTargetCairo::InitAlreadyReferenced(cairo_surface_t* aSurface, const IntSize& aSize)
{
mContext = cairo_create(aSurface);
mSurface = aSurface;
mSize = aSize;
mFormat = CairoContentToGfxFormat(cairo_surface_get_content(aSurface));
return true;
}
TemporaryRef<DrawTarget>
DrawTargetCairo::CreateShadowDrawTarget(const IntSize &aSize, SurfaceFormat aFormat,
float aSigma) const
{
cairo_surface_t* similar = cairo_surface_create_similar(cairo_get_target(mContext),
GfxFormatToCairoContent(aFormat),
aSize.width, aSize.height);
if (cairo_surface_status(similar)) {
return nullptr;
}
// If we don't have a blur then we can use the RGBA mask and keep all the
// operations in graphics memory.
if (aSigma == 0.0F) {
RefPtr<DrawTargetCairo> target = new DrawTargetCairo();
target->InitAlreadyReferenced(similar, aSize);
return target;
}
cairo_surface_t* blursurf = cairo_image_surface_create(CAIRO_FORMAT_A8,
aSize.width,
aSize.height);
if (cairo_surface_status(blursurf)) {
return nullptr;
}
cairo_surface_t* tee = cairo_tee_surface_create(blursurf);
cairo_surface_destroy(blursurf);
if (cairo_surface_status(tee)) {
cairo_surface_destroy(similar);
return nullptr;
}
cairo_tee_surface_add(tee, similar);
cairo_surface_destroy(similar);
RefPtr<DrawTargetCairo> target = new DrawTargetCairo();
target->InitAlreadyReferenced(tee, aSize);
return target;
}
bool
DrawTargetCairo::Init(cairo_surface_t* aSurface, const IntSize& aSize)
{
cairo_surface_reference(aSurface);
return InitAlreadyReferenced(aSurface, aSize);
}
void *
DrawTargetCairo::GetNativeSurface(NativeSurfaceType aType)
{
if (aType == NATIVE_SURFACE_CAIRO_SURFACE) {
return cairo_get_target(mContext);
}
return nullptr;
}
void
DrawTargetCairo::MarkSnapshotIndependent()
{
if (mSnapshot) {
if (mSnapshot->refCount() > 1) {
// We only need to worry about snapshots that someone else knows about
mSnapshot->DrawTargetWillChange();
}
mSnapshot = nullptr;
}
}
void
DrawTargetCairo::WillChange(const Path* aPath /* = nullptr */)
{
MarkSnapshotIndependent();
if (mPathObserver &&
(!aPath || !mPathObserver->ContainsPath(aPath))) {
mPathObserver->PathWillChange();
mPathObserver = nullptr;
}
}
void
DrawTargetCairo::SetPathObserver(CairoPathContext* aPathObserver)
{
if (mPathObserver && mPathObserver != aPathObserver) {
mPathObserver->PathWillChange();
}
mPathObserver = aPathObserver;
}
void
DrawTargetCairo::SetTransform(const Matrix& aTransform)
{
mTransform = aTransform;
cairo_matrix_t mat;
GfxMatrixToCairoMatrix(mTransform, mat);
cairo_set_matrix(mContext, &mat);
}
}
}
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