gpu: play skp files through the command buffer

gpu/skia_runner/sk_picture_rasterizer.cc

+// Copyright (c) 2015 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 "gpu/skia_runner/sk_picture_rasterizer.h"
+
+#include <iostream>
+
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkSurface.h"
+#include "third_party/skia/include/core/SkSurfaceProps.h"
+
+namespace skia_runner {
+
+SkPictureRasterizer::SkPictureRasterizer(skia::RefPtr<GrContext> gr_context,
+                                         int max_texture_size)
+    : use_lcd_text_(false),
+      use_distance_field_text_(false),
+      msaa_sample_count_(0),
+      max_texture_size_(max_texture_size),
+      gr_context_(gr_context) {
+}
+
+SkPictureRasterizer::~SkPictureRasterizer() {
+}
+
+skia::RefPtr<SkImage> SkPictureRasterizer::RasterizeTile(
+    const SkPicture* picture,
+    const SkRect& rect) const {
+  DCHECK(gr_context_);
+
+  SkImageInfo info = SkImageInfo::MakeN32Premul(rect.width(), rect.height());
+  uint32_t flags = 0;
+  if (use_distance_field_text_)
+    flags = SkSurfaceProps::kUseDistanceFieldFonts_Flag;
+
+  SkSurfaceProps surface_props =
+      use_lcd_text_
+          ? SkSurfaceProps(flags, SkSurfaceProps::kLegacyFontHost_InitType)
+          : SkSurfaceProps(flags, kUnknown_SkPixelGeometry);
+
+  skia::RefPtr<SkSurface> sk_surface(skia::AdoptRef(
+      SkSurface::NewRenderTarget(gr_context_.get(), SkSurface::kYes_Budgeted,
+                                 info, msaa_sample_count_, &surface_props)));
+  if (sk_surface) {
+    SkCanvas* canvas = sk_surface->getCanvas();
+    canvas->translate(-rect.left(), -rect.top());
+    canvas->drawPicture(picture);
+
+    return skia::AdoptRef(sk_surface->newImageSnapshot());
+  }
+  return nullptr;
+}
+
+skia::RefPtr<SkImage> SkPictureRasterizer::Rasterize(
+    const SkPicture* picture) const {
+  if (!gr_context_)
+    return nullptr;
+
+  SkRect picture_rect = picture->cullRect();
+  if (picture_rect.width() <= max_texture_size_ &&
+      picture_rect.height() <= max_texture_size_)
+    return RasterizeTile(picture, picture_rect);
+
+  SkImageInfo info =
+      SkImageInfo::MakeN32Premul(picture_rect.width(), picture_rect.height());
+
+  skia::RefPtr<SkSurface> sk_surface(
+      skia::AdoptRef(SkSurface::NewRaster(info)));
+  SkCanvas* canvas = sk_surface->getCanvas();
+
+  int num_tiles_x = picture_rect.width() / max_texture_size_ + 1;
+  int num_tiles_y = picture_rect.height() / max_texture_size_ + 1;
+  for (int y = 0; y < num_tiles_y; ++y) {
+    SkRect tile_rect;
+    tile_rect.fTop = picture_rect.top() + y * max_texture_size_;
+    tile_rect.fBottom =
+        std::min(tile_rect.fTop + max_texture_size_, picture_rect.bottom());
+    for (int x = 0; x < num_tiles_x; ++x) {
+      tile_rect.fLeft = picture_rect.left() + x * max_texture_size_;
+      tile_rect.fRight =
+          std::min(tile_rect.fLeft + max_texture_size_, picture_rect.right());
+      skia::RefPtr<SkImage> tile(RasterizeTile(picture, tile_rect));
+      // canvas.drawBitmap(tile, tile_rect.left(), tile_rect.top());
+      canvas->drawImage(tile.get(), tile_rect.left(), tile_rect.top());
+    }
+  }
+  return skia::AdoptRef(sk_surface->newImageSnapshot());
+}
+
+}  // namepsace skia_runner