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Issue 9416017: Optionally clear PlatformCanvas instances. (Closed) Base URL: svn://svn.chromium.org/chrome/trunk/src/
Patch Set: Address comments. Created 8 years, 9 months ago
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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 #include <windows.h> 5 #include <windows.h>
6 6
7 #include "skia/ext/vector_platform_device_emf_win.h" 7 #include "skia/ext/vector_platform_device_emf_win.h"
8 8
9 #include "skia/ext/bitmap_platform_device.h" 9 #include "skia/ext/bitmap_platform_device.h"
10 #include "skia/ext/skia_utils_win.h" 10 #include "skia/ext/skia_utils_win.h"
11 #include "third_party/skia/include/core/SkTemplates.h" 11 #include "third_party/skia/include/core/SkTemplates.h"
12 #include "third_party/skia/include/core/SkUtils.h" 12 #include "third_party/skia/include/core/SkUtils.h"
13 #include "third_party/skia/include/ports/SkTypeface_win.h" 13 #include "third_party/skia/include/ports/SkTypeface_win.h"
14 14
15 namespace skia { 15 namespace skia {
16 16
17 // static 17 // static
18 SkDevice* VectorPlatformDeviceEmf::CreateDevice( 18 SkDevice* VectorPlatformDeviceEmf::CreateDevice(
19 int width, int height, bool is_opaque, HANDLE shared_section) { 19 int width, int height, bool is_opaque, HANDLE shared_section) {
20 if (!is_opaque) { 20 if (!is_opaque) {
21 // TODO(maruel): http://crbug.com/18382 When restoring a semi-transparent 21 // TODO(maruel): http://crbug.com/18382 When restoring a semi-transparent
22 // layer, i.e. merging it, we need to rasterize it because GDI doesn't 22 // layer, i.e. merging it, we need to rasterize it because GDI doesn't
23 // support transparency except for AlphaBlend(). Right now, a 23 // support transparency except for AlphaBlend(). Right now, a
24 // BitmapPlatformDevice is created when VectorCanvas think a saveLayers() 24 // BitmapPlatformDevice is created when VectorCanvas think a saveLayers()
25 // call is being done. The way to save a layer would be to create an 25 // call is being done. The way to save a layer would be to create an
26 // EMF-based VectorDevice and have this device registers the drawing. When 26 // EMF-based VectorDevice and have this device registers the drawing. When
27 // playing back the device into a bitmap, do it at the printer's dpi instead 27 // playing back the device into a bitmap, do it at the printer's dpi instead
28 // of the layout's dpi (which is much lower). 28 // of the layout's dpi (which is much lower).
29 return BitmapPlatformDevice::create(width, height, is_opaque, 29 return BitmapPlatformDevice::Create(width, height, is_opaque,
30 shared_section); 30 shared_section);
31 } 31 }
32 32
33 // TODO(maruel): http://crbug.com/18383 Look if it would be worth to 33 // TODO(maruel): http://crbug.com/18383 Look if it would be worth to
34 // increase the resolution by ~10x (any worthy factor) to increase the 34 // increase the resolution by ~10x (any worthy factor) to increase the
35 // rendering precision (think about printing) while using a relatively 35 // rendering precision (think about printing) while using a relatively
36 // low dpi. This happens because we receive float as input but the GDI 36 // low dpi. This happens because we receive float as input but the GDI
37 // functions works with integers. The idea is to premultiply the matrix 37 // functions works with integers. The idea is to premultiply the matrix
38 // with this factor and multiply each SkScalar that are passed to 38 // with this factor and multiply each SkScalar that are passed to
39 // SkScalarRound(value) as SkScalarRound(value * 10). Safari is already 39 // SkScalarRound(value) as SkScalarRound(value * 10). Safari is already
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862 pixels, 862 pixels,
863 reinterpret_cast<const BITMAPINFO*>(&hdr), 863 reinterpret_cast<const BITMAPINFO*>(&hdr),
864 DIB_RGB_COLORS, 864 DIB_RGB_COLORS,
865 SRCCOPY); 865 SRCCOPY);
866 } 866 }
867 EndPlatformPaint(); 867 EndPlatformPaint();
868 Cleanup(); 868 Cleanup();
869 } 869 }
870 870
871 } // namespace skia 871 } // namespace skia
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