| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "third_party/blink/renderer/core/html/canvas/canvas_rendering_context_host.h" |
| |
| #include "third_party/blink/public/platform/platform.h" |
| #include "third_party/blink/renderer/core/html/canvas/canvas_async_blob_creator.h" |
| #include "third_party/blink/renderer/core/html/canvas/canvas_rendering_context.h" |
| #include "third_party/blink/renderer/platform/graphics/gpu/shared_gpu_context.h" |
| #include "third_party/blink/renderer/platform/graphics/skia/skia_utils.h" |
| #include "third_party/blink/renderer/platform/graphics/static_bitmap_image.h" |
| #include "third_party/skia/include/core/SkSurface.h" |
| |
| namespace blink { |
| |
| CanvasRenderingContextHost::CanvasRenderingContextHost() = default; |
| |
| scoped_refptr<StaticBitmapImage> |
| CanvasRenderingContextHost::CreateTransparentImage(const IntSize& size) const { |
| if (!IsValidImageSize(size)) |
| return nullptr; |
| CanvasColorParams color_params = CanvasColorParams(); |
| if (RenderingContext()) |
| color_params = RenderingContext()->ColorParams(); |
| SkImageInfo info = SkImageInfo::Make( |
| size.Width(), size.Height(), color_params.GetSkColorType(), |
| kPremul_SkAlphaType, color_params.GetSkColorSpaceForSkSurfaces()); |
| sk_sp<SkSurface> surface = |
| SkSurface::MakeRaster(info, info.minRowBytes(), nullptr); |
| if (!surface) |
| return nullptr; |
| return StaticBitmapImage::Create(surface->makeImageSnapshot()); |
| } |
| |
| bool CanvasRenderingContextHost::IsPaintable() const { |
| return (RenderingContext() && RenderingContext()->IsPaintable()) || |
| IsValidImageSize(Size()); |
| } |
| |
| void CanvasRenderingContextHost::RestoreCanvasMatrixClipStack( |
| PaintCanvas* canvas) const { |
| if (RenderingContext()) |
| RenderingContext()->RestoreCanvasMatrixClipStack(canvas); |
| } |
| |
| bool CanvasRenderingContextHost::Is3d() const { |
| return RenderingContext() && RenderingContext()->Is3d(); |
| } |
| |
| bool CanvasRenderingContextHost::Is2d() const { |
| return RenderingContext() && RenderingContext()->Is2d(); |
| } |
| |
| CanvasResourceProvider* |
| CanvasRenderingContextHost::GetOrCreateCanvasResourceProvider() { |
| if (!ResourceProvider() && !did_fail_to_create_resource_provider_) { |
| resource_provider_is_clear_ = true; |
| if (IsValidImageSize(Size())) { |
| if (Is3d()) { |
| ReplaceResourceProvider(CanvasResourceProvider::Create( |
| Size(), |
| Platform::Current()->IsGpuCompositingDisabled() |
| ? CanvasResourceProvider::kSoftwareResourceUsage |
| : CanvasResourceProvider::kAcceleratedResourceUsage, |
| SharedGpuContext::ContextProviderWrapper(), |
| 0, // msaa_sample_count |
| ColorParams(), CanvasResourceProvider::kDefaultPresentationMode)); |
| } else { |
| // 2d context |
| // TODO: move resource provider ownership from canvas 2d layer bridge |
| // to here. |
| NOTREACHED(); |
| } |
| } |
| if (!ResourceProvider()) { |
| did_fail_to_create_resource_provider_ = true; |
| } |
| } |
| return ResourceProvider(); |
| } |
| |
| CanvasColorParams CanvasRenderingContextHost::ColorParams() const { |
| if (RenderingContext()) |
| return RenderingContext()->ColorParams(); |
| return CanvasColorParams(); |
| } |
| |
| ScriptPromise CanvasRenderingContextHost::convertToBlob( |
| ScriptState* script_state, |
| const ImageEncodeOptions& options, |
| ExceptionState& exception_state) const { |
| WTF::String object_name = "Canvas"; |
| if (this->IsOffscreenCanvas()) |
| object_name = "OffscreenCanvas"; |
| std::stringstream error_msg; |
| |
| if (this->IsOffscreenCanvas() && this->IsNeutered()) { |
| exception_state.ThrowDOMException(DOMExceptionCode::kInvalidStateError, |
| "OffscreenCanvas object is detached."); |
| return ScriptPromise(); |
| } |
| |
| if (!this->OriginClean()) { |
| error_msg << "Tainted " << object_name << " may not be exported."; |
| exception_state.ThrowSecurityError(error_msg.str().c_str()); |
| return ScriptPromise(); |
| } |
| |
| if (!this->IsPaintable() || Size().IsEmpty()) { |
| error_msg << "The size of " << object_name << " iz zero."; |
| exception_state.ThrowDOMException(DOMExceptionCode::kIndexSizeError, |
| error_msg.str().c_str()); |
| return ScriptPromise(); |
| } |
| |
| if (!RenderingContext()) { |
| error_msg << object_name << " has no rendering context."; |
| exception_state.ThrowDOMException(DOMExceptionCode::kInvalidStateError, |
| error_msg.str().c_str()); |
| return ScriptPromise(); |
| } |
| |
| double start_time = WTF::CurrentTimeTicksInSeconds(); |
| scoped_refptr<StaticBitmapImage> image_bitmap = |
| RenderingContext()->GetImage(kPreferNoAcceleration); |
| if (image_bitmap) { |
| ScriptPromiseResolver* resolver = |
| ScriptPromiseResolver::Create(script_state); |
| CanvasAsyncBlobCreator::ToBlobFunctionType function_type = |
| CanvasAsyncBlobCreator::kHTMLCanvasConvertToBlobPromise; |
| if (this->IsOffscreenCanvas()) { |
| function_type = |
| CanvasAsyncBlobCreator::kOffscreenCanvasConvertToBlobPromise; |
| } |
| CanvasAsyncBlobCreator* async_creator = CanvasAsyncBlobCreator::Create( |
| image_bitmap, options, function_type, start_time, |
| ExecutionContext::From(script_state), resolver); |
| async_creator->ScheduleAsyncBlobCreation(options.quality()); |
| return resolver->Promise(); |
| } |
| exception_state.ThrowDOMException(DOMExceptionCode::kNotReadableError, |
| "Readback of the source image has failed."); |
| return ScriptPromise(); |
| } |
| |
| } // namespace blink |