1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/*
* Copyright (C) 2008 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "GraphicsContext.h"
#include "AffineTransform.h"
#include "Path.h"
#include <cairo-win32.h>
#include "GraphicsContextPlatformPrivateCairo.h"
using namespace std;
namespace WebCore {
static cairo_t* createCairoContextWithHDC(HDC hdc, bool hasAlpha)
{
// Put the HDC In advanced mode so it will honor affine transforms.
SetGraphicsMode(hdc, GM_ADVANCED);
cairo_surface_t* surface = 0;
HBITMAP bitmap = static_cast<HBITMAP>(GetCurrentObject(hdc, OBJ_BITMAP));
BITMAP info;
if (!GetObject(bitmap, sizeof(info), &info))
surface = cairo_win32_surface_create(hdc);
else {
ASSERT(info.bmBitsPixel == 32);
surface = cairo_image_surface_create_for_data((unsigned char*)info.bmBits,
CAIRO_FORMAT_ARGB32,
info.bmWidth,
info.bmHeight,
info.bmWidthBytes);
}
cairo_t* context = cairo_create(surface);
cairo_surface_destroy(surface);
return context;
}
GraphicsContext::GraphicsContext(HDC dc, bool hasAlpha)
: m_updatingControlTints(false)
{
platformInit(dc, hasAlpha);
}
void GraphicsContext::platformInit(HDC dc, bool hasAlpha)
{
cairo_t* cr = 0;
if (dc)
cr = createCairoContextWithHDC(dc, hasAlpha);
else
setPaintingDisabled(true);
m_data = new GraphicsContextPlatformPrivateToplevel(new PlatformContextCairo(cr));
m_data->m_hdc = dc;
if (platformContext()->cr()) {
// Make sure the context starts in sync with our state.
setPlatformFillColor(fillColor(), fillColorSpace());
setPlatformStrokeColor(strokeColor(), strokeColorSpace());
}
}
static void setRGBABitmapAlpha(unsigned char* bytes, size_t length, unsigned char level)
{
for (size_t i = 0; i < length; i += 4)
bytes[i + 3] = level;
}
static void drawBitmapToContext(GraphicsContextPlatformPrivate* context, cairo_t* cr, const DIBPixelData& pixelData, const IntSize& translate)
{
// Need to make a cairo_surface_t out of the bitmap's pixel buffer and then draw
// it into our context.
cairo_surface_t* surface = cairo_image_surface_create_for_data(pixelData.buffer(),
CAIRO_FORMAT_ARGB32,
pixelData.size().width(),
pixelData.size().height(),
pixelData.bytesPerRow());
// Flip the target surface so that when we set the srcImage as
// the surface it will draw right-side-up.
cairo_save(cr);
cairo_translate(cr, static_cast<double>(translate.width()), static_cast<double>(translate.height()));
cairo_scale(cr, 1, -1);
cairo_set_source_surface(cr, surface, 0, 0);
if (context->layers.size())
cairo_paint_with_alpha(cr, context->layers.last());
else
cairo_paint(cr);
// Delete all our junk.
cairo_surface_destroy(surface);
cairo_restore(cr);
}
void GraphicsContext::releaseWindowsContext(HDC hdc, const IntRect& dstRect, bool supportAlphaBlend, bool mayCreateBitmap)
{
bool createdBitmap = mayCreateBitmap && (!m_data->m_hdc || inTransparencyLayer());
if (!hdc || !createdBitmap) {
m_data->restore();
return;
}
if (dstRect.isEmpty())
return;
OwnPtr<HBITMAP> bitmap = adoptPtr(static_cast<HBITMAP>(GetCurrentObject(hdc, OBJ_BITMAP)));
DIBPixelData pixelData(bitmap.get());
ASSERT(pixelData.bitsPerPixel() == 32);
// If this context does not support alpha blending, then it may have
// been drawn with GDI functions which always set the alpha channel
// to zero. We need to manually set the bitmap to be fully opaque.
unsigned char* bytes = reinterpret_cast<unsigned char*>(pixelData.buffer());
if (!supportAlphaBlend)
setRGBABitmapAlpha(bytes, pixelData.size().height() * pixelData.bytesPerRow(), 255);
drawBitmapToContext(m_data, platformContext()->cr(), pixelData, IntSize(dstRect.x(), dstRect.height() + dstRect.y()));
::DeleteDC(hdc);
}
void GraphicsContext::drawWindowsBitmap(WindowsBitmap* bitmap, const IntPoint& point)
{
drawBitmapToContext(m_data, platformContext()->cr(), bitmap->windowsDIB(), IntSize(point.x(), bitmap->size().height() + point.y()));
}
void GraphicsContextPlatformPrivate::syncContext(cairo_t* cr)
{
if (!cr)
return;
cairo_surface_t* surface = cairo_get_target(cr);
m_hdc = cairo_win32_surface_get_dc(surface);
SetGraphicsMode(m_hdc, GM_ADVANCED); // We need this call for themes to honor world transforms.
}
void GraphicsContextPlatformPrivate::flush()
{
cairo_surface_t* surface = cairo_win32_surface_create(m_hdc);
cairo_surface_flush(surface);
cairo_surface_destroy(surface);
}
}
|
