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| 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 "DIBPixelData.h" | |
| 31 #include "Path.h" | |
| 32 | |
| 33 #include <cairo-win32.h> | |
| 34 #include "GraphicsContextPlatformPrivateCairo.h" | |
| 35 | |
| 36 using namespace std; | |
| 37 | |
| 38 namespace WebCore { | |
| 39 | |
| 40 #if PLATFORM(WIN) | |
| 41 static cairo_t* createCairoContextWithHDC(HDC hdc, bool hasAlpha) | |
| 42 { | |
| 43 // Put the HDC In advanced mode so it will honor affine transforms. | |
| 44 SetGraphicsMode(hdc, GM_ADVANCED); | |
| 45 | |
| 46 cairo_surface_t* surface = 0; | |
| 47 | |
| 48 HBITMAP bitmap = static_cast<HBITMAP>(GetCurrentObject(hdc, OBJ_BITMAP)); | |
| 49 | |
| 50 BITMAP info; | |
| 51 if (!GetObject(bitmap, sizeof(info), &info)) | |
| 52 surface = cairo_win32_surface_create(hdc); | |
| 53 else { | |
| 54 ASSERT(info.bmBitsPixel == 32); | |
| 55 | |
| 56 surface = cairo_image_surface_create_for_data((unsigned char*)info.bmBit
s, | |
| 57 CAIRO_FORMAT_ARGB32, | |
| 58 info.bmWidth, | |
| 59 info.bmHeight, | |
| 60 info.bmWidthBytes); | |
| 61 } | |
| 62 | |
| 63 cairo_t* context = cairo_create(surface); | |
| 64 cairo_surface_destroy(surface); | |
| 65 | |
| 66 return context; | |
| 67 } | |
| 68 | |
| 69 GraphicsContext::GraphicsContext(HDC dc, bool hasAlpha) | |
| 70 : m_updatingControlTints(false), | |
| 71 m_transparencyCount(0) | |
| 72 { | |
| 73 platformInit(dc, hasAlpha); | |
| 74 } | |
| 75 | |
| 76 void GraphicsContext::platformInit(HDC dc, bool hasAlpha) | |
| 77 { | |
| 78 cairo_t* cr = 0; | |
| 79 if (dc) | |
| 80 cr = createCairoContextWithHDC(dc, hasAlpha); | |
| 81 else | |
| 82 setPaintingDisabled(true); | |
| 83 | |
| 84 m_data = new GraphicsContextPlatformPrivateToplevel(new PlatformContextCairo
(cr)); | |
| 85 m_data->m_hdc = dc; | |
| 86 if (platformContext()->cr()) { | |
| 87 // Make sure the context starts in sync with our state. | |
| 88 setPlatformFillColor(fillColor(), fillColorSpace()); | |
| 89 setPlatformStrokeColor(strokeColor(), strokeColorSpace()); | |
| 90 } | |
| 91 if (cr) | |
| 92 cairo_destroy(cr); | |
| 93 } | |
| 94 #endif | |
| 95 | |
| 96 static void setRGBABitmapAlpha(unsigned char* bytes, size_t length, unsigned cha
r level) | |
| 97 { | |
| 98 for (size_t i = 0; i < length; i += 4) | |
| 99 bytes[i + 3] = level; | |
| 100 } | |
| 101 | |
| 102 static void drawBitmapToContext(GraphicsContextPlatformPrivate* context, cairo_t
* cr, const DIBPixelData& pixelData, const IntSize& translate) | |
| 103 { | |
| 104 // Need to make a cairo_surface_t out of the bitmap's pixel buffer and then
draw | |
| 105 // it into our context. | |
| 106 cairo_surface_t* surface = cairo_image_surface_create_for_data(pixelData.buf
fer(), | |
| 107 CAIRO_FORMAT_
ARGB32, | |
| 108 pixelData.siz
e().width(), | |
| 109 pixelData.siz
e().height(), | |
| 110 pixelData.byt
esPerRow()); | |
| 111 | |
| 112 // Flip the target surface so that when we set the srcImage as | |
| 113 // the surface it will draw right-side-up. | |
| 114 cairo_save(cr); | |
| 115 cairo_translate(cr, static_cast<double>(translate.width()), static_cast<doub
le>(translate.height())); | |
| 116 cairo_scale(cr, 1, -1); | |
| 117 cairo_set_source_surface(cr, surface, 0, 0); | |
| 118 | |
| 119 if (context->layers.size()) | |
| 120 cairo_paint_with_alpha(cr, context->layers.last()); | |
| 121 else | |
| 122 cairo_paint(cr); | |
| 123 | |
| 124 // Delete all our junk. | |
| 125 cairo_surface_destroy(surface); | |
| 126 cairo_restore(cr); | |
| 127 } | |
| 128 | |
| 129 void GraphicsContext::releaseWindowsContext(HDC hdc, const IntRect& dstRect, boo
l supportAlphaBlend, bool mayCreateBitmap) | |
| 130 { | |
| 131 bool createdBitmap = mayCreateBitmap && (!m_data->m_hdc || isInTransparencyL
ayer()); | |
| 132 if (!hdc || !createdBitmap) { | |
| 133 m_data->restore(); | |
| 134 return; | |
| 135 } | |
| 136 | |
| 137 if (dstRect.isEmpty()) | |
| 138 return; | |
| 139 | |
| 140 OwnPtr<HBITMAP> bitmap = adoptPtr(static_cast<HBITMAP>(GetCurrentObject(hdc,
OBJ_BITMAP))); | |
| 141 | |
| 142 DIBPixelData pixelData(bitmap.get()); | |
| 143 ASSERT(pixelData.bitsPerPixel() == 32); | |
| 144 | |
| 145 // If this context does not support alpha blending, then it may have | |
| 146 // been drawn with GDI functions which always set the alpha channel | |
| 147 // to zero. We need to manually set the bitmap to be fully opaque. | |
| 148 unsigned char* bytes = reinterpret_cast<unsigned char*>(pixelData.buffer()); | |
| 149 if (!supportAlphaBlend) | |
| 150 setRGBABitmapAlpha(bytes, pixelData.size().height() * pixelData.bytesPer
Row(), 255); | |
| 151 | |
| 152 drawBitmapToContext(m_data, platformContext()->cr(), pixelData, IntSize(dstR
ect.x(), dstRect.height() + dstRect.y())); | |
| 153 | |
| 154 ::DeleteDC(hdc); | |
| 155 } | |
| 156 | |
| 157 #if PLATFORM(WIN) | |
| 158 void GraphicsContext::drawWindowsBitmap(WindowsBitmap* bitmap, const IntPoint& p
oint) | |
| 159 { | |
| 160 drawBitmapToContext(m_data, platformContext()->cr(), bitmap->windowsDIB(), I
ntSize(point.x(), bitmap->size().height() + point.y())); | |
| 161 } | |
| 162 | |
| 163 void GraphicsContextPlatformPrivate::syncContext(cairo_t* cr) | |
| 164 { | |
| 165 if (!cr) | |
| 166 return; | |
| 167 | |
| 168 cairo_surface_t* surface = cairo_get_target(cr); | |
| 169 m_hdc = cairo_win32_surface_get_dc(surface); | |
| 170 | |
| 171 SetGraphicsMode(m_hdc, GM_ADVANCED); // We need this call for themes to hono
r world transforms. | |
| 172 } | |
| 173 | |
| 174 void GraphicsContextPlatformPrivate::flush() | |
| 175 { | |
| 176 cairo_surface_t* surface = cairo_win32_surface_create(m_hdc); | |
| 177 cairo_surface_flush(surface); | |
| 178 cairo_surface_destroy(surface); | |
| 179 } | |
| 180 #endif | |
| 181 | |
| 182 } | |
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