gpu: play skp files through the command buffer

gpu/skia_runner/skia_runner.cc

Index: gpu/skia_runner/skia_runner.cc
diff --git a/gpu/skia_runner/skia_runner.cc b/gpu/skia_runner/skia_runner.cc
new file mode 100644
index 0000000000000000000000000000000000000000..304b2ab127720cf1d39c1fc0560511b66f247be4
--- /dev/null
+++ b/gpu/skia_runner/skia_runner.cc
@@ -0,0 +1,225 @@
+// 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 <iostream>
+
+#include "base/at_exit.h"
+#include "base/command_line.h"
+#include "base/files/file_enumerator.h"
+#include "base/files/file_util.h"
+#include "base/strings/string_number_conversions.h"
+#include "gpu/skia_runner/in_process_graphics_system.h"
+#include "gpu/skia_runner/sk_picture_rasterizer.h"
+#include "third_party/WebKit/public/platform/WebData.h"
+#include "third_party/WebKit/public/platform/WebImage.h"
+#include "third_party/WebKit/public/platform/WebSize.h"
+#include "third_party/skia/include/core/SkOSFile.h"
+#include "third_party/skia/include/core/SkPicture.h"
+#include "third_party/skia/include/core/SkStream.h"
+#include "ui/gfx/codec/png_codec.h"
+
+#if defined(OS_MACOSX)
+#include "base/mac/scoped_nsautorelease_pool.h"
+#endif
+
+namespace {
+
+bool WriteSkImagePNG(const SkImage* image, const base::FilePath& path) {
+  DCHECK(!path.empty());
+
+  if (!image) {
+    std::cout << "Unable to write empty bitmap for " << path.value() << ".\n";
+    return false;
+  }
+
+  std::string file_path = path.MaybeAsASCII();
+  SkFILEWStream stream(file_path.c_str());
+  if (!stream.isValid()) {
+    std::cout << "Unable to write to " << file_path.c_str() << ".\n";
+    return false;
+  }
+
+  SkImageInfo info = SkImageInfo::Make(image->width(), image->height(),
+                                       SkColorType::kBGRA_8888_SkColorType,
+                                       SkAlphaType::kPremul_SkAlphaType);
+  SkImageInfo::MakeN32Premul(image->width(), image->height());
+
+  const size_t rowBytes = image->width() * sizeof(SkPMColor);
+  std::vector<SkPMColor> pixels(image->width() * image->height());
+
+  if (image->readPixels(info, pixels.data(), rowBytes, 0, 0)) {
+    std::vector<unsigned char> png_data;
+
+    if (gfx::PNGCodec::Encode(
+            reinterpret_cast<const unsigned char*>(pixels.data()),
+            gfx::PNGCodec::FORMAT_BGRA,
+            gfx::Size(image->width(), image->height()),
+            static_cast<int>(rowBytes), false,
+            std::vector<gfx::PNGCodec::Comment>(), &png_data)) {
+      if (stream.write(png_data.data(), png_data.size())) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
+bool onDecode(const void* buffer, size_t size, SkBitmap* bm) {
+  blink::WebData web_data(static_cast<const char*>(buffer), size);
+  blink::WebImage image = blink::WebImage::fromData(web_data, blink::WebSize());
+  if (!image.isNull()) {
+    *bm = image.getSkBitmap();
+    return true;
+  }
+  std::cout << "Error decoding image.\n";
+  return false;
+}
+
+skia::RefPtr<SkPicture> ReadPicture(const base::FilePath& path) {
+  skia::RefPtr<SkPicture> picture;
+  std::string file_path = path.MaybeAsASCII();
+  SkAutoTDelete<SkStream> stream(SkStream::NewFromFile(file_path.c_str()));
+  if (!stream.get()) {
+    std::cout << "Unable to read " << file_path.c_str() << ".\n";
+    return picture;
+  }
+
+  picture = skia::AdoptRef(SkPicture::CreateFromStream(stream.get(), onDecode));
+  if (!picture) {
+    std::cout << "Unable to load " << file_path.c_str()
+              << " as an SkPicture.\n";
+  }
+  return picture;
+}
+
+base::FilePath MakeDestinationFilename(
+    base::FilePath source_file,
+    base::FilePath destination_folder,
+    base::FilePath::StringType new_extension) {
+  base::FilePath filename = source_file.BaseName().RemoveExtension();
+  filename = filename.AddExtension(new_extension);
+  return destination_folder.AsEndingWithSeparator().Append(filename);
+}
+
+std::vector<std::pair<base::FilePath, base::FilePath>> GetSkpsToRasterize(
+    base::FilePath input_path,
+    base::FilePath output_path) {
+  std::vector<std::pair<base::FilePath, base::FilePath>> files;
+
+  if (base::DirectoryExists(input_path)) {
+    if (!base::DirectoryExists(output_path)) {
+      return files;
+    }
+    base::FilePath::StringType extension = FILE_PATH_LITERAL(".skp");
+    base::FileEnumerator file_iter(input_path, false,
+                                   base::FileEnumerator::FILES);
+    while (!file_iter.Next().empty()) {
+      if (file_iter.GetInfo().GetName().MatchesExtension(extension)) {
+        base::FilePath skp_file = file_iter.GetInfo().GetName();
+        skp_file = input_path.AsEndingWithSeparator().Append(skp_file);
+        base::FilePath png_file = MakeDestinationFilename(
+            skp_file, output_path, FILE_PATH_LITERAL("png"));
+        files.push_back(std::make_pair(skp_file, png_file));
+      }
+    }
+  } else {
+    // Single file passed. If the output file is a folder, make a name.
+    if (base::DirectoryExists(output_path)) {
+      output_path = MakeDestinationFilename(input_path, output_path,
+                                            FILE_PATH_LITERAL("png"));
+    }
+    files.push_back(std::make_pair(input_path, output_path));
+  }
+  return files;
+}
+
+static const char kHelpMessage[] =
+    "This program renders a skia SKP to a PNG using GPU rasterization via the\n"
+    "command buffer.\n\n"
+    "following command line flags to control its behavior:\n"
+    "\n"
+    "  --in-skp=skp[:DIRECTORY_PATH|FILE_PATH]\n"
+    "      Input SKP file. If a directory is provided, all SKP files will be\n"
+    "      converted.\n"
+    "  --out-png=png[:DIRECTORY_PATH|:FILE_PATH]\n"
+    "      Output PNG file. If a directory is provided, the SKP filename is "
+    "used.\n\n"
+    "  --use-lcd-text\n"
+    "      Turn on lcd text rendering.\n"
+    "  --use-distance-field-text\n"
+    "      Turn on distance field text rendering.\n"
+    "  --msaa-sample-count=(0|2|4|8|16)\n"
+    "      Turn on multi-sample anti-aliasing.\n"
+    "  --use-gl=(desktop|osmesa|egl|swiftshader)\n"
+    "      Specify Gl driver. --swiftshader-path required for swiftshader.\n";
+
+}  // namespace anonymous
+
+int main(int argc, char** argv) {
+  base::AtExitManager exit_manager;
+  base::CommandLine::Init(argc, argv);
+#if defined(OS_MACOSX)
+  base::mac::ScopedNSAutoreleasePool autorelease_pool;
+#endif
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  base::FilePath input_path(command_line->GetSwitchValuePath("in-skp"));
+  base::FilePath output_path(command_line->GetSwitchValuePath("out-png"));
+
+  if (input_path.empty() || output_path.empty()) {
+    std::cout << kHelpMessage;
+    return 0;
+  }
+
+  std::vector<std::pair<base::FilePath, base::FilePath>> files =
+      GetSkpsToRasterize(input_path, output_path);
+
+  if (files.empty()) {
+    if (!base::DirectoryExists(output_path))
+      std::cout << "You must specify an existing directory using '--out-png'\n";
+    else
+      std::cout << "No skp files found at " << input_path.value() << "\n";
+    return 0;
+  }
+
+  skia_runner::InProcessGraphicsSystem graphics_system;
+  if (!graphics_system.IsSuccessfullyInitialized()) {
+    LOG(ERROR) << "Unable to initialize rasterizer.";
+    return 0;
+  }
+
+  skia_runner::SkPictureRasterizer picture_rasterizer(
+      graphics_system.GetGrContext(), graphics_system.GetMaxTextureSize());
+
+  // Set up command-line render options.
+  picture_rasterizer.set_use_lcd_text(command_line->HasSwitch("use-lcd-text"));
+  picture_rasterizer.set_use_distance_field_text(
+      command_line->HasSwitch("use-distance-field-text"));
+
+  if (command_line->HasSwitch("msaa-sample-count")) {
+    std::string value = command_line->GetSwitchValueASCII("msaa-sample-count");
+    int msaa = 0;
+    if (base::StringToInt(value, &msaa))
+      picture_rasterizer.set_msaa_sample_count(msaa);
+
+    if (msaa != 0 && msaa != 2 && msaa != 4 && msaa != 8 && msaa != 16) {
+      std::cout << "Error: msaa sample count must be 0, 2, 4, 8 or 16.\n";
+      return 0;
+    }
+  }
+
+  for (auto file_pair : files) {
+    skia::RefPtr<SkPicture> picture = ReadPicture(file_pair.first);
+    if (!picture) {
+      std::cout << "Error reading: " << file_pair.first.value() << "\n";
+      continue;
+    }
+
+    skia::RefPtr<SkImage> image(picture_rasterizer.Rasterize(picture.get()));
+    if (!WriteSkImagePNG(image.get(), file_pair.second))
+      std::cout << "Error writing: " << file_pair.second.value() << "\n";
+    else
+      std::cout << file_pair.second.value() << " successfully created.\n";
+  }
+}