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/*
* Copyright (C) 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_CANVAS_CANVAS_RENDERING_CONTEXT_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_CANVAS_CANVAS_RENDERING_CONTEXT_H_
#include "base/macros.h"
#include "third_party/blink/public/platform/web_thread.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/html/canvas/canvas_context_creation_attributes_core.h"
#include "third_party/blink/renderer/core/html/canvas/html_canvas_element.h"
#include "third_party/blink/renderer/core/layout/hit_test_canvas_result.h"
#include "third_party/blink/renderer/core/offscreencanvas/offscreen_canvas.h"
#include "third_party/blink/renderer/platform/graphics/canvas_color_params.h"
#include "third_party/blink/renderer/platform/graphics/color_behavior.h"
#include "third_party/blink/renderer/platform/wtf/hash_set.h"
#include "third_party/blink/renderer/platform/wtf/text/string_hash.h"
#include "third_party/skia/include/core/SkColorSpace.h"
#include "third_party/skia/include/core/SkImageInfo.h"
namespace blink {
class CanvasImageSource;
class HTMLCanvasElement;
class ImageBitmap;
constexpr const char* kSRGBCanvasColorSpaceName = "srgb";
constexpr const char* kRec2020CanvasColorSpaceName = "rec2020";
constexpr const char* kP3CanvasColorSpaceName = "p3";
constexpr const char* kRGBA8CanvasPixelFormatName = "8-8-8-8";
constexpr const char* kRGB10A2CanvasPixelFormatName = "10-10-10-2";
constexpr const char* kRGBA12CanvasPixelFormatName = "12-12-12-12";
constexpr const char* kF16CanvasPixelFormatName = "float16";
class CORE_EXPORT CanvasRenderingContext : public ScriptWrappable,
public WebThread::TaskObserver {
USING_PRE_FINALIZER(CanvasRenderingContext, Dispose);
public:
~CanvasRenderingContext() override = default;
// A Canvas can either be "2D" or "webgl" but never both. Requesting a context
// with a type different from an existing will destroy the latter.
enum ContextType {
// Do not change assigned numbers of existing items: add new features to the
// end of the list.
kContext2d = 0,
kContextExperimentalWebgl = 2,
kContextWebgl = 3,
kContextWebgl2 = 4,
kContextImageBitmap = 5,
kContextXRPresent = 6,
kContextWebgl2Compute = 7,
kContextTypeCount,
};
static ContextType ContextTypeFromId(const String& id);
static ContextType ResolveContextTypeAliases(ContextType);
CanvasRenderingContextHost* Host() const { return host_; }
WTF::String ColorSpaceAsString() const;
WTF::String PixelFormatAsString() const;
const CanvasColorParams& ColorParams() const { return color_params_; }
virtual scoped_refptr<StaticBitmapImage> GetImage(AccelerationHint) const = 0;
virtual ContextType GetContextType() const = 0;
virtual bool IsComposited() const = 0;
virtual bool IsAccelerated() const = 0;
virtual bool IsOriginTopLeft() const {
// Canvas contexts have the origin of coordinates on the top left corner.
// Accelerated resources (e.g. GPU textures) have their origin of
// coordinates in the uppper left corner.
return !IsAccelerated();
}
virtual bool ShouldAntialias() const { return false; }
virtual void SetIsHidden(bool) = 0;
virtual bool isContextLost() const { return true; }
// TODO(fserb): remove SetCanvasGetContextResult.
virtual void SetCanvasGetContextResult(RenderingContext&) { NOTREACHED(); };
virtual void SetOffscreenCanvasGetContextResult(OffscreenRenderingContext&) {
NOTREACHED();
}
virtual bool IsPaintable() const = 0;
virtual void DidDraw(const SkIRect& dirty_rect);
virtual void DidDraw();
// Return true if the content is updated.
virtual bool PaintRenderingResultsToCanvas(SourceDrawingBuffer) {
return false;
}
virtual cc::Layer* CcLayer() const { return nullptr; }
enum LostContextMode {
kNotLostContext,
// Lost context occurred at the graphics system level.
kRealLostContext,
// Lost context provoked by WEBGL_lose_context.
kWebGLLoseContextLostContext,
// Lost context occurred due to internal implementation reasons.
kSyntheticLostContext,
};
virtual void LoseContext(LostContextMode) {}
// This method gets called at the end of script tasks that modified
// the contents of the canvas (called didDraw). It marks the completion
// of a presentable frame.
virtual void FinalizeFrame() {}
void NeedsFinalizeFrame();
// WebThread::TaskObserver implementation
void DidProcessTask() override;
void WillProcessTask() final {}
// Canvas2D-specific interface
virtual bool Is2d() const { return false; }
virtual void RestoreCanvasMatrixClipStack(cc::PaintCanvas*) const {}
virtual void Reset() {}
virtual void ClearRect(double x, double y, double width, double height) {}
virtual void DidSetSurfaceSize() {}
virtual void SetShouldAntialias(bool) {}
virtual unsigned HitRegionsCount() const { return 0; }
virtual void setFont(const String&) {}
virtual void StyleDidChange(const ComputedStyle* old_style,
const ComputedStyle& new_style) {}
virtual HitTestCanvasResult* GetControlAndIdIfHitRegionExists(
const LayoutPoint& location) {
NOTREACHED();
return HitTestCanvasResult::Create(String(), nullptr);
}
virtual String GetIdFromControl(const Element* element) { return String(); }
virtual void ResetUsageTracking(){};
// WebGL-specific interface
virtual bool Is3d() const { return false; }
virtual void SetFilterQuality(SkFilterQuality) { NOTREACHED(); }
virtual void Reshape(int width, int height) { NOTREACHED(); }
virtual void MarkLayerComposited() { NOTREACHED(); }
virtual scoped_refptr<Uint8Array> PaintRenderingResultsToDataArray(
SourceDrawingBuffer) {
NOTREACHED();
return nullptr;
}
virtual int ExternallyAllocatedBufferCountPerPixel() {
NOTREACHED();
return 0;
}
virtual IntSize DrawingBufferSize() const {
NOTREACHED();
return IntSize(0, 0);
}
// OffscreenCanvas-specific methods
virtual void PushFrame() {}
virtual ImageBitmap* TransferToImageBitmap(ScriptState*) { return nullptr; }
bool WouldTaintOrigin(CanvasImageSource*, const SecurityOrigin*);
void DidMoveToNewDocument(Document*);
void DetachHost() { host_ = nullptr; }
const CanvasContextCreationAttributesCore& CreationAttributes() const {
return creation_attributes_;
}
void Trace(blink::Visitor*) override;
virtual void Stop() = 0;
protected:
CanvasRenderingContext(CanvasRenderingContextHost*,
const CanvasContextCreationAttributesCore&);
private:
void Dispose();
Member<CanvasRenderingContextHost> host_;
HashSet<String> clean_urls_;
HashSet<String> dirty_urls_;
CanvasColorParams color_params_;
CanvasContextCreationAttributesCore creation_attributes_;
bool finalize_frame_scheduled_ = false;
DISALLOW_COPY_AND_ASSIGN(CanvasRenderingContext);
};
} // namespace blink
#endif
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