1 /*
2 * Copyright (C) 2008 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26 #include "config.h"
27 #include "GraphicsContext.h"
28
29 #include "TransformationMatrix.h"
30 #include "Path.h"
31
32 #include <cairo-win32.h>
33 #include "GraphicsContextPlatformPrivateCairo.h"
34
35 using namespace std;
36
37 namespace WebCore {
38
createCairoContextWithHDC(HDC hdc,bool hasAlpha)39 static cairo_t* createCairoContextWithHDC(HDC hdc, bool hasAlpha)
40 {
41 // Put the HDC In advanced mode so it will honor affine transforms.
42 SetGraphicsMode(hdc, GM_ADVANCED);
43
44 HBITMAP bitmap = static_cast<HBITMAP>(GetCurrentObject(hdc, OBJ_BITMAP));
45
46 BITMAP info;
47 GetObject(bitmap, sizeof(info), &info);
48 ASSERT(info.bmBitsPixel == 32);
49
50 cairo_surface_t* image = cairo_image_surface_create_for_data((unsigned char*)info.bmBits,
51 CAIRO_FORMAT_ARGB32,
52 info.bmWidth,
53 info.bmHeight,
54 info.bmWidthBytes);
55
56 cairo_t* context = cairo_create(image);
57 cairo_surface_destroy(image);
58
59 return context;
60 }
61
GraphicsContext(HDC dc,bool hasAlpha)62 GraphicsContext::GraphicsContext(HDC dc, bool hasAlpha)
63 : m_common(createGraphicsContextPrivate())
64 , m_data(new GraphicsContextPlatformPrivate)
65 {
66 if (dc) {
67 m_data->cr = createCairoContextWithHDC(dc, hasAlpha);
68 m_data->m_hdc = dc;
69 } else {
70 setPaintingDisabled(true);
71 m_data->cr = 0;
72 m_data->m_hdc = 0;
73 }
74
75 if (m_data->cr) {
76 // Make sure the context starts in sync with our state.
77 setPlatformFillColor(fillColor());
78 setPlatformStrokeColor(strokeColor());
79 }
80 }
81
releaseWindowsContext(HDC hdc,const IntRect & dstRect,bool supportAlphaBlend,bool mayCreateBitmap)82 void GraphicsContext::releaseWindowsContext(HDC hdc, const IntRect& dstRect, bool supportAlphaBlend, bool mayCreateBitmap)
83 {
84 if (!mayCreateBitmap || !hdc || !inTransparencyLayer()) {
85 m_data->restore();
86 return;
87 }
88
89 if (dstRect.isEmpty())
90 return;
91
92 HBITMAP bitmap = static_cast<HBITMAP>(GetCurrentObject(hdc, OBJ_BITMAP));
93
94 BITMAP info;
95 GetObject(bitmap, sizeof(info), &info);
96 ASSERT(info.bmBitsPixel == 32);
97
98 // Need to make a cairo_surface_t out of the bitmap's pixel buffer and then draw
99 // it into our context.
100 cairo_surface_t* image = cairo_image_surface_create_for_data((unsigned char*)info.bmBits,
101 CAIRO_FORMAT_ARGB32,
102 info.bmWidth,
103 info.bmHeight,
104 info.bmWidthBytes);
105
106 // Scale the target surface to the new image size, and flip it
107 // so that when we set the srcImage as the surface it will draw
108 // right-side-up.
109 cairo_translate(m_data->cr, 0, dstRect.height());
110 cairo_scale(m_data->cr, dstRect.width(), -dstRect.height());
111 cairo_set_source_surface (m_data->cr, image, dstRect.x(), dstRect.y());
112
113 if (m_data->layers.size())
114 cairo_paint_with_alpha(m_data->cr, m_data->layers.last());
115 else
116 cairo_paint(m_data->cr);
117
118 // Delete all our junk.
119 cairo_surface_destroy(image);
120 ::DeleteDC(hdc);
121 ::DeleteObject(bitmap);
122 }
123
syncContext(PlatformGraphicsContext * cr)124 void GraphicsContextPlatformPrivate::syncContext(PlatformGraphicsContext* cr)
125 {
126 if (!cr)
127 return;
128
129 cairo_surface_t* surface = cairo_get_target(cr);
130 m_hdc = cairo_win32_surface_get_dc(surface);
131
132 SetGraphicsMode(m_hdc, GM_ADVANCED); // We need this call for themes to honor world transforms.
133 }
134
flush()135 void GraphicsContextPlatformPrivate::flush()
136 {
137 cairo_surface_t* surface = cairo_win32_surface_create(m_hdc);
138 cairo_surface_flush(surface);
139 cairo_surface_destroy(surface);
140 }
141
142 }
143