Canvas2D on WebGL texture

third_party/WebKit/Source/platform/graphics/gpu/TextureImageBufferSurface.cpp

+/*
+ * Copyright (c) 2013, Google 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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 THE COPYRIGHT
+ * OWNER 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.
+ */
+
+#include "platform/graphics/gpu/TextureImageBufferSurface.h"
+
+#include "gpu/command_buffer/client/gles2_interface.h"
+#include "gpu/command_buffer/common/mailbox.h"
+#include "gpu/command_buffer/common/sync_token.h"
+#include "platform/graphics/gpu/SharedGpuContext.h"
+#include "platform/graphics/skia/SkiaUtils.h"
+#include "platform/wtf/PtrUtil.h"
+#include "platform/wtf/RefPtr.h"
+#include "skia/ext/texture_handle.h"
+#include "third_party/skia/include/gpu/GrBackendSurface.h"
+#include "third_party/skia/include/gpu/GrContext.h"
+
+namespace blink {
+
+TextureImageBufferSurface::TextureImageBufferSurface(
+    gpu::gles2::GLES2Interface* webgl_gl,
+    GLenum texture_target,
+    GLuint webgl_texture_id,
+    const IntSize& size,
+    OpacityMode opacity_mode,
+    const CanvasColorParams& color_params)
+    : ImageBufferSurface(size, opacity_mode, color_params) {
+  if (!SharedGpuContext::IsValid())
+    return;
+  gpu::gles2::GLES2Interface* gl = SharedGpuContext::Gl();
+  GrContext* gr_context = SharedGpuContext::Gr();
+  context_id_ = SharedGpuContext::ContextId();
+  CHECK(gr_context);
+
+  gpu::Mailbox mailbox;
+  webgl_gl->GenMailboxCHROMIUM(mailbox.name);
+  DVLOG(1) << webgl_texture_id << " / " << texture_target;
+  webgl_gl->ProduceTextureDirectCHROMIUM(webgl_texture_id, texture_target,
+                                         mailbox.name);
+
+  gpu::SyncToken sync_token;
+  const GLuint64 fence_sync = webgl_gl->InsertFenceSyncCHROMIUM();
+  webgl_gl->Flush();
+  webgl_gl->GenSyncTokenCHROMIUM(fence_sync, sync_token.GetData());
+  gl->WaitSyncTokenCHROMIUM(sync_token.GetData());
+
+  GLuint texture =
+      gl->CreateAndConsumeTextureCHROMIUM(texture_target, mailbox.name);
+
+  SkAlphaType alpha_type =
+      (kOpaque == opacity_mode) ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
+  SkImageInfo info = SkImageInfo::Make(
+      size.Width(), size.Height(), color_params.GetSkColorType(), alpha_type,
+      color_params.GetSkColorSpaceForSkSurfaces());
+  SkSurfaceProps disable_lcd_props(0, kUnknown_SkPixelGeometry);
+
+  GrGLTextureInfo tinfo;
+  tinfo.fTarget = texture_target;
+  tinfo.fID = texture;
+  GrBackendTextureDesc desc;
+  desc.fFlags = kRenderTarget_GrBackendTextureFlag;
+  desc.fOrigin = kBottomLeft_GrSurfaceOrigin;
+  desc.fWidth = size.Width();
+  desc.fHeight = size.Height();
+  desc.fSampleCnt = 0;
+  desc.fConfig = kSkia8888_GrPixelConfig;
+  desc.fTextureHandle = skia::GrGLTextureInfoToGrBackendObject(tinfo);
+  surface_ = SkSurface::MakeFromBackendTexture(
+      gr_context, desc, color_params.GetSkColorSpaceForSkSurfaces(),
+      kOpaque == opacity_mode ? nullptr : &disable_lcd_props);
+
+  if (!surface_)
+    return;
+
+  DVLOG(1) << "texture: " << texture;
+  DVLOG(1) << "Skia texture: " << GetBackingTextureHandleForOverwrite();
+
+  canvas_ = WTF::WrapUnique(new SkiaPaintCanvas(surface_->getCanvas()));
+  Clear();
+
+  // Always save an initial frame, to support resetting the top level matrix
+  // and clip.
+  canvas_->save();
+}
+
+bool TextureImageBufferSurface::IsValid() const {
+  return surface_ && SharedGpuContext::IsValid() &&
+         context_id_ == SharedGpuContext::ContextId();
+}
+
+sk_sp<SkImage> TextureImageBufferSurface::NewImageSnapshot(AccelerationHint,
+                                                           SnapshotReason) {
+  return surface_->makeImageSnapshot();
+}
+
+GLuint TextureImageBufferSurface::GetBackingTextureHandleForOverwrite() {
+  if (!surface_)
+    return 0;
+  return skia::GrBackendObjectToGrGLTextureInfo(
+             surface_->getTextureHandle(
+                 SkSurface::kDiscardWrite_TextureHandleAccess))
+      ->fID;
+}
+
+bool TextureImageBufferSurface::WritePixels(const SkImageInfo& orig_info,
+                                            const void* pixels,
+                                            size_t row_bytes,
+                                            int x,
+                                            int y) {
+  return surface_->getCanvas()->writePixels(orig_info, pixels, row_bytes, x, y);
+}
+
+}  // namespace blink