// Copyright (c) 2006-2009 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 "skia/ext/vector_canvas.h"

#include "skia/ext/bitmap_platform_device.h"
#include "skia/ext/vector_platform_device.h"

namespace skia {

VectorCanvas::VectorCanvas(HDC dc, int width, int height) {
  bool initialized = initialize(dc, width, height);
  if (!initialized)
    __debugbreak();
}

bool VectorCanvas::initialize(HDC context, int width, int height) {
  SkDevice* device = createPlatformDevice(width, height, true, context);
  if (!device)
    return false;

  setDevice(device);
  device->unref();  // was created with refcount 1, and setDevice also refs
  return true;
}

SkDevice* VectorCanvas::createDevice(SkBitmap::Config config,
                                     int width, int height,
                                     bool is_opaque, bool isForLayer) {
  SkASSERT(config == SkBitmap::kARGB_8888_Config);
  return createPlatformDevice(width, height, is_opaque, NULL);
}

SkDevice* VectorCanvas::createPlatformDevice(int width,
                                             int height, bool is_opaque,
                                             HANDLE shared_section) {
  if (!is_opaque) {
    // TODO(maruel):  http://crbug.com/18382 When restoring a semi-transparent
    // layer, i.e. merging it, we need to rasterize it because GDI doesn't
    // support transparency except for AlphaBlend(). Right now, a
    // BitmapPlatformDevice is created when VectorCanvas think a saveLayers()
    // call is being done. The way to save a layer would be to create an
    // EMF-based VectorDevice and have this device registers the drawing. When
    // playing back the device into a bitmap, do it at the printer's dpi instead
    // of the layout's dpi (which is much lower).
    return BitmapPlatformDevice::create(width, height,
                                        is_opaque, shared_section);
  }

  // TODO(maruel):  http://crbug.com/18383 Look if it would be worth to
  // increase the resolution by ~10x (any worthy factor) to increase the
  // rendering precision (think about printing) while using a relatively
  // low dpi. This happens because we receive float as input but the GDI
  // functions works with integers. The idea is to premultiply the matrix
  // with this factor and multiply each SkScalar that are passed to
  // SkScalarRound(value) as SkScalarRound(value * 10). Safari is already
  // doing the same for text rendering.
  SkASSERT(shared_section);
  PlatformDevice* device = VectorPlatformDevice::create(
      reinterpret_cast<HDC>(shared_section), width, height);
  return device;
}

}  // namespace skia