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 "AffineTransform.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 cairo_surface_t* surface = 0;
45
46 HBITMAP bitmap = static_cast<HBITMAP>(GetCurrentObject(hdc, OBJ_BITMAP));
47
48 BITMAP info;
49 if (!GetObject(bitmap, sizeof(info), &info))
50 surface = cairo_win32_surface_create(hdc);
51 else {
52 ASSERT(info.bmBitsPixel == 32);
53
54 surface = cairo_image_surface_create_for_data((unsigned char*)info.bmBits,
55 CAIRO_FORMAT_ARGB32,
56 info.bmWidth,
57 info.bmHeight,
58 info.bmWidthBytes);
59 }
60
61 cairo_t* context = cairo_create(surface);
62 cairo_surface_destroy(surface);
63
64 return context;
65 }
66
GraphicsContext(HDC dc,bool hasAlpha)67 GraphicsContext::GraphicsContext(HDC dc, bool hasAlpha)
68 : m_updatingControlTints(false)
69 {
70 platformInit(dc, hasAlpha);
71 }
72
platformInit(HDC dc,bool hasAlpha)73 void GraphicsContext::platformInit(HDC dc, bool hasAlpha)
74 {
75 cairo_t* cr = 0;
76 if (dc)
77 cr = createCairoContextWithHDC(dc, hasAlpha);
78 else
79 setPaintingDisabled(true);
80
81 m_data = new GraphicsContextPlatformPrivateToplevel(new PlatformContextCairo(cr));
82 m_data->m_hdc = dc;
83 if (platformContext()->cr()) {
84 // Make sure the context starts in sync with our state.
85 setPlatformFillColor(fillColor(), fillColorSpace());
86 setPlatformStrokeColor(strokeColor(), strokeColorSpace());
87 }
88 }
89
setRGBABitmapAlpha(unsigned char * bytes,size_t length,unsigned char level)90 static void setRGBABitmapAlpha(unsigned char* bytes, size_t length, unsigned char level)
91 {
92 for (size_t i = 0; i < length; i += 4)
93 bytes[i + 3] = level;
94 }
95
drawBitmapToContext(GraphicsContextPlatformPrivate * context,cairo_t * cr,const DIBPixelData & pixelData,const IntSize & translate)96 static void drawBitmapToContext(GraphicsContextPlatformPrivate* context, cairo_t* cr, const DIBPixelData& pixelData, const IntSize& translate)
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* surface = cairo_image_surface_create_for_data(pixelData.buffer(),
101 CAIRO_FORMAT_ARGB32,
102 pixelData.size().width(),
103 pixelData.size().height(),
104 pixelData.bytesPerRow());
105
106 // Flip the target surface so that when we set the srcImage as
107 // the surface it will draw right-side-up.
108 cairo_save(cr);
109 cairo_translate(cr, static_cast<double>(translate.width()), static_cast<double>(translate.height()));
110 cairo_scale(cr, 1, -1);
111 cairo_set_source_surface(cr, surface, 0, 0);
112
113 if (context->layers.size())
114 cairo_paint_with_alpha(cr, context->layers.last());
115 else
116 cairo_paint(cr);
117
118 // Delete all our junk.
119 cairo_surface_destroy(surface);
120 cairo_restore(cr);
121 }
122
releaseWindowsContext(HDC hdc,const IntRect & dstRect,bool supportAlphaBlend,bool mayCreateBitmap)123 void GraphicsContext::releaseWindowsContext(HDC hdc, const IntRect& dstRect, bool supportAlphaBlend, bool mayCreateBitmap)
124 {
125 bool createdBitmap = mayCreateBitmap && (!m_data->m_hdc || inTransparencyLayer());
126 if (!hdc || !createdBitmap) {
127 m_data->restore();
128 return;
129 }
130
131 if (dstRect.isEmpty())
132 return;
133
134 OwnPtr<HBITMAP> bitmap = adoptPtr(static_cast<HBITMAP>(GetCurrentObject(hdc, OBJ_BITMAP)));
135
136 DIBPixelData pixelData(bitmap.get());
137 ASSERT(pixelData.bitsPerPixel() == 32);
138
139 // If this context does not support alpha blending, then it may have
140 // been drawn with GDI functions which always set the alpha channel
141 // to zero. We need to manually set the bitmap to be fully opaque.
142 unsigned char* bytes = reinterpret_cast<unsigned char*>(pixelData.buffer());
143 if (!supportAlphaBlend)
144 setRGBABitmapAlpha(bytes, pixelData.size().height() * pixelData.bytesPerRow(), 255);
145
146 drawBitmapToContext(m_data, platformContext()->cr(), pixelData, IntSize(dstRect.x(), dstRect.height() + dstRect.y()));
147
148 ::DeleteDC(hdc);
149 }
150
drawWindowsBitmap(WindowsBitmap * bitmap,const IntPoint & point)151 void GraphicsContext::drawWindowsBitmap(WindowsBitmap* bitmap, const IntPoint& point)
152 {
153 drawBitmapToContext(m_data, platformContext()->cr(), bitmap->windowsDIB(), IntSize(point.x(), bitmap->size().height() + point.y()));
154 }
155
syncContext(cairo_t * cr)156 void GraphicsContextPlatformPrivate::syncContext(cairo_t* cr)
157 {
158 if (!cr)
159 return;
160
161 cairo_surface_t* surface = cairo_get_target(cr);
162 m_hdc = cairo_win32_surface_get_dc(surface);
163
164 SetGraphicsMode(m_hdc, GM_ADVANCED); // We need this call for themes to honor world transforms.
165 }
166
flush()167 void GraphicsContextPlatformPrivate::flush()
168 {
169 cairo_surface_t* surface = cairo_win32_surface_create(m_hdc);
170 cairo_surface_flush(surface);
171 cairo_surface_destroy(surface);
172 }
173
174 }
175