1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "skia/ext/platform_canvas.h"
6
7 #include "skia/ext/bitmap_platform_device.h"
8 #include "third_party/skia/include/core/SkTypes.h"
9
10 namespace skia {
11
GetTopDevice(const SkCanvas & canvas)12 SkBaseDevice* GetTopDevice(const SkCanvas& canvas) {
13 return canvas.getTopDevice(true);
14 }
15
SupportsPlatformPaint(const SkCanvas * canvas)16 bool SupportsPlatformPaint(const SkCanvas* canvas) {
17 PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
18 return platform_device && platform_device->SupportsPlatformPaint();
19 }
20
BeginPlatformPaint(SkCanvas * canvas)21 PlatformSurface BeginPlatformPaint(SkCanvas* canvas) {
22 PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
23 if (platform_device)
24 return platform_device->BeginPlatformPaint();
25
26 return 0;
27 }
28
EndPlatformPaint(SkCanvas * canvas)29 void EndPlatformPaint(SkCanvas* canvas) {
30 PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
31 if (platform_device)
32 platform_device->EndPlatformPaint();
33 }
34
DrawToNativeContext(SkCanvas * canvas,PlatformSurface context,int x,int y,const PlatformRect * src_rect)35 void DrawToNativeContext(SkCanvas* canvas, PlatformSurface context, int x,
36 int y, const PlatformRect* src_rect) {
37 PlatformDevice* platform_device = GetPlatformDevice(GetTopDevice(*canvas));
38 if (platform_device)
39 platform_device->DrawToNativeContext(context, x, y, src_rect);
40 }
41
MakeOpaqueXfermodeProc(SkPMColor src,SkPMColor dst)42 static SkPMColor MakeOpaqueXfermodeProc(SkPMColor src, SkPMColor dst) {
43 return dst | (0xFF << SK_A32_SHIFT);
44 }
45
MakeOpaque(SkCanvas * canvas,int x,int y,int width,int height)46 void MakeOpaque(SkCanvas* canvas, int x, int y, int width, int height) {
47 if (width <= 0 || height <= 0)
48 return;
49
50 SkRect rect;
51 rect.setXYWH(SkIntToScalar(x), SkIntToScalar(y),
52 SkIntToScalar(width), SkIntToScalar(height));
53 SkPaint paint;
54 // so we don't draw anything on a device that ignores xfermodes
55 paint.setColor(0);
56 // install our custom mode
57 skia::RefPtr<SkProcXfermode> xfermode =
58 skia::AdoptRef(new SkProcXfermode(MakeOpaqueXfermodeProc));
59 paint.setXfermode(xfermode.get());
60 canvas->drawRect(rect, paint);
61 }
62
PlatformCanvasStrideForWidth(unsigned width)63 size_t PlatformCanvasStrideForWidth(unsigned width) {
64 return 4 * width;
65 }
66
CreateCanvas(const skia::RefPtr<SkBaseDevice> & device,OnFailureType failureType)67 SkCanvas* CreateCanvas(const skia::RefPtr<SkBaseDevice>& device, OnFailureType failureType) {
68 if (!device) {
69 if (CRASH_ON_FAILURE == failureType)
70 SK_CRASH();
71 return NULL;
72 }
73 return new SkCanvas(device.get());
74 }
75
PlatformBitmap()76 PlatformBitmap::PlatformBitmap() : surface_(0), platform_extra_(0) {}
77
78 } // namespace skia
79