2 * Copyright (C) 2006 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) 2007 Holger Hans Peter Freyther <zecke@selfish.org>
4 * Copyright (C) 2008, 2009 Dirk Schulze <krit@webkit.org>
5 * Copyright (C) 2010 Torch Mobile (Beijing) Co. Ltd. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
24 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include "ImageBuffer.h"
33 #include "BitmapImage.h"
34 #include "CairoUtilities.h"
36 #include "GraphicsContext.h"
37 #include "ImageData.h"
38 #include "MIMETypeRegistry.h"
39 #include "NotImplemented.h"
41 #include "PlatformContextCairo.h"
42 #include "PlatformString.h"
43 #include "RefPtrCairo.h"
45 #include <wtf/Vector.h>
51 ImageBufferData::ImageBufferData(const IntSize& size)
53 , m_platformContext(0)
57 ImageBuffer::ImageBuffer(const IntSize& size, ColorSpace, RenderingMode, bool& success)
61 success = false; // Make early return mean error.
62 m_data.m_surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
65 if (cairo_surface_status(m_data.m_surface) != CAIRO_STATUS_SUCCESS)
66 return; // create will notice we didn't set m_initialized and fail.
68 RefPtr<cairo_t> cr = adoptRef(cairo_create(m_data.m_surface));
69 m_data.m_platformContext.setCr(cr.get());
70 m_context = adoptPtr(new GraphicsContext(&m_data.m_platformContext));
74 ImageBuffer::~ImageBuffer()
76 cairo_surface_destroy(m_data.m_surface);
79 size_t ImageBuffer::dataSize() const
81 return m_size.width() * m_size.height() * 4;
84 GraphicsContext* ImageBuffer::context() const
86 return m_context.get();
89 PassRefPtr<Image> ImageBuffer::copyImage(BackingStoreCopy copyBehavior) const
91 ASSERT(copyBehavior == CopyBackingStore);
92 // BitmapImage will release the passed in surface on destruction
93 return BitmapImage::create(copyCairoImageSurface(m_data.m_surface).leakRef());
96 void ImageBuffer::clip(GraphicsContext* context, const FloatRect& maskRect) const
98 context->platformContext()->pushImageMask(m_data.m_surface, maskRect);
101 void ImageBuffer::draw(GraphicsContext* context, ColorSpace styleColorSpace, const FloatRect& destRect, const FloatRect& srcRect,
102 CompositeOperator op , bool useLowQualityScale)
104 // BitmapImage will release the passed in surface on destruction
105 RefPtr<Image> image = BitmapImage::create(cairo_surface_reference(m_data.m_surface));
106 context->drawImage(image.get(), styleColorSpace, destRect, srcRect, op, useLowQualityScale);
109 void ImageBuffer::drawPattern(GraphicsContext* context, const FloatRect& srcRect, const AffineTransform& patternTransform,
110 const FloatPoint& phase, ColorSpace styleColorSpace, CompositeOperator op, const FloatRect& destRect)
112 // BitmapImage will release the passed in surface on destruction
113 RefPtr<Image> image = BitmapImage::create(cairo_surface_reference(m_data.m_surface));
114 image->drawPattern(context, srcRect, patternTransform, phase, styleColorSpace, op, destRect);
117 void ImageBuffer::platformTransformColorSpace(const Vector<int>& lookUpTable)
119 ASSERT(cairo_surface_get_type(m_data.m_surface) == CAIRO_SURFACE_TYPE_IMAGE);
121 unsigned char* dataSrc = cairo_image_surface_get_data(m_data.m_surface);
122 int stride = cairo_image_surface_get_stride(m_data.m_surface);
123 for (int y = 0; y < m_size.height(); ++y) {
124 unsigned* row = reinterpret_cast<unsigned*>(dataSrc + stride * y);
125 for (int x = 0; x < m_size.width(); x++) {
126 unsigned* pixel = row + x;
127 Color pixelColor = colorFromPremultipliedARGB(*pixel);
128 pixelColor = Color(lookUpTable[pixelColor.red()],
129 lookUpTable[pixelColor.green()],
130 lookUpTable[pixelColor.blue()],
132 *pixel = premultipliedARGBFromColor(pixelColor);
135 cairo_surface_mark_dirty_rectangle (m_data.m_surface, 0, 0, m_size.width(), m_size.height());
138 template <Multiply multiplied>
139 PassRefPtr<ByteArray> getImageData(const IntRect& rect, const ImageBufferData& data, const IntSize& size)
141 ASSERT(cairo_surface_get_type(data.m_surface) == CAIRO_SURFACE_TYPE_IMAGE);
143 RefPtr<ByteArray> result = ByteArray::create(rect.width() * rect.height() * 4);
144 unsigned char* dataSrc = cairo_image_surface_get_data(data.m_surface);
145 unsigned char* dataDst = result->data();
147 if (rect.x() < 0 || rect.y() < 0 || (rect.x() + rect.width()) > size.width() || (rect.y() + rect.height()) > size.height())
148 memset(dataDst, 0, result->length());
150 int originx = rect.x();
156 int endx = rect.maxX();
157 if (endx > size.width())
159 int numColumns = endx - originx;
161 int originy = rect.y();
167 int endy = rect.maxY();
168 if (endy > size.height())
169 endy = size.height();
170 int numRows = endy - originy;
172 int stride = cairo_image_surface_get_stride(data.m_surface);
173 unsigned destBytesPerRow = 4 * rect.width();
175 unsigned char* destRows = dataDst + desty * destBytesPerRow + destx * 4;
176 for (int y = 0; y < numRows; ++y) {
177 unsigned* row = reinterpret_cast<unsigned*>(dataSrc + stride * (y + originy));
178 for (int x = 0; x < numColumns; x++) {
180 unsigned* pixel = row + x + originx;
182 if (multiplied == Unmultiplied)
183 pixelColor = colorFromPremultipliedARGB(*pixel);
185 pixelColor = Color(*pixel);
186 destRows[basex] = pixelColor.red();
187 destRows[basex + 1] = pixelColor.green();
188 destRows[basex + 2] = pixelColor.blue();
189 destRows[basex + 3] = pixelColor.alpha();
191 destRows += destBytesPerRow;
194 return result.release();
197 PassRefPtr<ByteArray> ImageBuffer::getUnmultipliedImageData(const IntRect& rect) const
199 return getImageData<Unmultiplied>(rect, m_data, m_size);
202 PassRefPtr<ByteArray> ImageBuffer::getPremultipliedImageData(const IntRect& rect) const
204 return getImageData<Premultiplied>(rect, m_data, m_size);
207 template <Multiply multiplied>
208 void putImageData(ByteArray*& source, const IntSize& sourceSize, const IntRect& sourceRect, const IntPoint& destPoint, ImageBufferData& data, const IntSize& size)
210 ASSERT(cairo_surface_get_type(data.m_surface) == CAIRO_SURFACE_TYPE_IMAGE);
212 unsigned char* dataDst = cairo_image_surface_get_data(data.m_surface);
214 ASSERT(sourceRect.width() > 0);
215 ASSERT(sourceRect.height() > 0);
217 int originx = sourceRect.x();
218 int destx = destPoint.x() + sourceRect.x();
220 ASSERT(destx < size.width());
221 ASSERT(originx >= 0);
222 ASSERT(originx <= sourceRect.maxX());
224 int endx = destPoint.x() + sourceRect.maxX();
225 ASSERT(endx <= size.width());
227 int numColumns = endx - destx;
229 int originy = sourceRect.y();
230 int desty = destPoint.y() + sourceRect.y();
232 ASSERT(desty < size.height());
233 ASSERT(originy >= 0);
234 ASSERT(originy <= sourceRect.maxY());
236 int endy = destPoint.y() + sourceRect.maxY();
237 ASSERT(endy <= size.height());
238 int numRows = endy - desty;
240 unsigned srcBytesPerRow = 4 * sourceSize.width();
241 int stride = cairo_image_surface_get_stride(data.m_surface);
243 unsigned char* srcRows = source->data() + originy * srcBytesPerRow + originx * 4;
244 for (int y = 0; y < numRows; ++y) {
245 unsigned* row = reinterpret_cast<unsigned*>(dataDst + stride * (y + desty));
246 for (int x = 0; x < numColumns; x++) {
248 unsigned* pixel = row + x + destx;
249 Color pixelColor(srcRows[basex],
253 if (multiplied == Unmultiplied)
254 *pixel = premultipliedARGBFromColor(pixelColor);
256 *pixel = pixelColor.rgb();
258 srcRows += srcBytesPerRow;
260 cairo_surface_mark_dirty_rectangle (data.m_surface,
262 numColumns, numRows);
265 void ImageBuffer::putUnmultipliedImageData(ByteArray* source, const IntSize& sourceSize, const IntRect& sourceRect, const IntPoint& destPoint)
267 putImageData<Unmultiplied>(source, sourceSize, sourceRect, destPoint, m_data, m_size);
270 void ImageBuffer::putPremultipliedImageData(ByteArray* source, const IntSize& sourceSize, const IntRect& sourceRect, const IntPoint& destPoint)
272 putImageData<Premultiplied>(source, sourceSize, sourceRect, destPoint, m_data, m_size);
276 static cairo_status_t writeFunction(void* closure, const unsigned char* data, unsigned int length)
278 Vector<char>* in = reinterpret_cast<Vector<char>*>(closure);
279 in->append(data, length);
280 return CAIRO_STATUS_SUCCESS;
283 String ImageBuffer::toDataURL(const String& mimeType, const double*) const
285 cairo_surface_t* image = cairo_get_target(context()->platformContext()->cr());
289 String actualMimeType("image/png");
290 if (MIMETypeRegistry::isSupportedImageMIMETypeForEncoding(mimeType))
291 actualMimeType = mimeType;
294 // Only PNG output is supported for now.
295 cairo_surface_write_to_png_stream(image, writeFunction, &in);
298 base64Encode(in, out);
300 return "data:" + actualMimeType + ";base64," + String(out.data(), out.size());
304 } // namespace WebCore