1/*
2 * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
3 * Copyright (C) 2004, 2005, 2006 Apple Inc.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include "config.h"
28#include "Image.h"
29
30#include "AffineTransform.h"
31#include "BitmapImage.h"
32#include "GraphicsContext.h"
33#include "ImageObserver.h"
34#include "Length.h"
35#include "MIMETypeRegistry.h"
36#include "SharedBuffer.h"
37#include <math.h>
38#include <wtf/MainThread.h>
39#include <wtf/StdLibExtras.h>
40
41#if USE(CG)
42#include <CoreFoundation/CoreFoundation.h>
43#endif
44
45namespace WebCore {
46
47Image::Image(ImageObserver* observer)
48    : m_imageObserver(observer)
49{
50}
51
52Image::~Image()
53{
54}
55
56Image* Image::nullImage()
57{
58    ASSERT(isMainThread());
59    static Image* nullImage = BitmapImage::create().leakRef();
60    return nullImage;
61}
62
63bool Image::supportsType(const String& type)
64{
65    return MIMETypeRegistry::isSupportedImageResourceMIMEType(type);
66}
67
68bool Image::setData(PassRefPtr<SharedBuffer> data, bool allDataReceived)
69{
70    m_encodedImageData = data;
71    if (!m_encodedImageData.get())
72        return true;
73
74    int length = m_encodedImageData->size();
75    if (!length)
76        return true;
77
78    return dataChanged(allDataReceived);
79}
80
81void Image::fillWithSolidColor(GraphicsContext* ctxt, const FloatRect& dstRect, const Color& color, ColorSpace styleColorSpace, CompositeOperator op)
82{
83    if (!color.alpha())
84        return;
85
86    CompositeOperator previousOperator = ctxt->compositeOperation();
87    ctxt->setCompositeOperation(!color.hasAlpha() && op == CompositeSourceOver ? CompositeCopy : op);
88    ctxt->fillRect(dstRect, color, styleColorSpace);
89    ctxt->setCompositeOperation(previousOperator);
90}
91
92void Image::draw(GraphicsContext* ctx, const FloatRect& dstRect, const FloatRect& srcRect, ColorSpace styleColorSpace, CompositeOperator op, BlendMode blendMode, ImageOrientationDescription description)
93{
94    draw(ctx, dstRect, srcRect, styleColorSpace, op, blendMode, description);
95}
96
97void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& destRect, const FloatPoint& srcPoint, const FloatSize& scaledTileSize, ColorSpace styleColorSpace, CompositeOperator op, BlendMode blendMode)
98{
99    if (mayFillWithSolidColor()) {
100        fillWithSolidColor(ctxt, destRect, solidColor(), styleColorSpace, op);
101        return;
102    }
103
104    ASSERT(!isBitmapImage() || notSolidColor());
105
106#if PLATFORM(IOS)
107    FloatSize intrinsicTileSize = originalSize();
108#else
109    FloatSize intrinsicTileSize = size();
110#endif
111    if (hasRelativeWidth())
112        intrinsicTileSize.setWidth(scaledTileSize.width());
113    if (hasRelativeHeight())
114        intrinsicTileSize.setHeight(scaledTileSize.height());
115
116    FloatSize scale(scaledTileSize.width() / intrinsicTileSize.width(),
117                    scaledTileSize.height() / intrinsicTileSize.height());
118
119    FloatRect oneTileRect;
120    FloatSize actualTileSize(scaledTileSize.width() + spaceSize().width(), scaledTileSize.height() + spaceSize().height());
121    oneTileRect.setX(destRect.x() + fmodf(fmodf(-srcPoint.x(), actualTileSize.width()) - actualTileSize.width(), actualTileSize.width()));
122    oneTileRect.setY(destRect.y() + fmodf(fmodf(-srcPoint.y(), actualTileSize.height()) - actualTileSize.height(), actualTileSize.height()));
123    oneTileRect.setSize(scaledTileSize);
124
125    // Check and see if a single draw of the image can cover the entire area we are supposed to tile.
126    if (oneTileRect.contains(destRect) && !ctxt->drawLuminanceMask()) {
127        FloatRect visibleSrcRect;
128        visibleSrcRect.setX((destRect.x() - oneTileRect.x()) / scale.width());
129        visibleSrcRect.setY((destRect.y() - oneTileRect.y()) / scale.height());
130        visibleSrcRect.setWidth(destRect.width() / scale.width());
131        visibleSrcRect.setHeight(destRect.height() / scale.height());
132        draw(ctxt, destRect, visibleSrcRect, styleColorSpace, op, blendMode, ImageOrientationDescription());
133        return;
134    }
135
136#if PLATFORM(IOS)
137    // When using accelerated drawing on iOS, it's faster to stretch an image than to tile it.
138    if (ctxt->isAcceleratedContext()) {
139        if (size().width() == 1 && intersection(oneTileRect, destRect).height() == destRect.height()) {
140            FloatRect visibleSrcRect;
141            visibleSrcRect.setX(0);
142            visibleSrcRect.setY((destRect.y() - oneTileRect.y()) / scale.height());
143            visibleSrcRect.setWidth(1);
144            visibleSrcRect.setHeight(destRect.height() / scale.height());
145            draw(ctxt, destRect, visibleSrcRect, styleColorSpace, op, BlendModeNormal, ImageOrientationDescription());
146            return;
147        }
148        if (size().height() == 1 && intersection(oneTileRect, destRect).width() == destRect.width()) {
149            FloatRect visibleSrcRect;
150            visibleSrcRect.setX((destRect.x() - oneTileRect.x()) / scale.width());
151            visibleSrcRect.setY(0);
152            visibleSrcRect.setWidth(destRect.width() / scale.width());
153            visibleSrcRect.setHeight(1);
154            draw(ctxt, destRect, visibleSrcRect, styleColorSpace, op, BlendModeNormal, ImageOrientationDescription());
155            return;
156        }
157    }
158#endif
159
160    // Patterned images and gradients can use lots of memory for caching when the
161    // tile size is large (<rdar://problem/4691859>, <rdar://problem/6239505>).
162    // Memory consumption depends on the transformed tile size which can get
163    // larger than the original tile if user zooms in enough.
164#if PLATFORM(IOS)
165    const float maxPatternTilePixels = 512 * 512;
166#else
167    const float maxPatternTilePixels = 2048 * 2048;
168#endif
169    FloatRect transformedTileSize = ctxt->getCTM().mapRect(FloatRect(FloatPoint(), scaledTileSize));
170    float transformedTileSizePixels = transformedTileSize.width() * transformedTileSize.height();
171    FloatRect currentTileRect = oneTileRect;
172    if (transformedTileSizePixels > maxPatternTilePixels) {
173        GraphicsContextStateSaver stateSaver(*ctxt);
174        ctxt->clip(destRect);
175
176        currentTileRect.shiftYEdgeTo(destRect.y());
177        float toY = currentTileRect.y();
178        while (toY < destRect.maxY()) {
179            currentTileRect.shiftXEdgeTo(destRect.x());
180            float toX = currentTileRect.x();
181            while (toX < destRect.maxX()) {
182                FloatRect toRect(toX, toY, currentTileRect.width(), currentTileRect.height());
183                FloatRect fromRect(toFloatPoint(currentTileRect.location() - oneTileRect.location()), currentTileRect.size());
184                fromRect.scale(1 / scale.width(), 1 / scale.height());
185
186                draw(ctxt, toRect, fromRect, styleColorSpace, op, BlendModeNormal, ImageOrientationDescription());
187                toX += currentTileRect.width();
188                currentTileRect.shiftXEdgeTo(oneTileRect.x());
189            }
190            toY += currentTileRect.height();
191            currentTileRect.shiftYEdgeTo(oneTileRect.y());
192        }
193        return;
194    }
195
196    AffineTransform patternTransform = AffineTransform().scaleNonUniform(scale.width(), scale.height());
197    FloatRect tileRect(FloatPoint(), intrinsicTileSize);
198    drawPattern(ctxt, tileRect, patternTransform, oneTileRect.location(), styleColorSpace, op, destRect, blendMode);
199
200#if PLATFORM(IOS)
201    startAnimation(DoNotCatchUp);
202#else
203    startAnimation();
204#endif
205}
206
207// FIXME: Merge with the other drawTiled eventually, since we need a combination of both for some things.
208void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect,
209    const FloatSize& tileScaleFactor, TileRule hRule, TileRule vRule, ColorSpace styleColorSpace, CompositeOperator op)
210{
211    if (mayFillWithSolidColor()) {
212        fillWithSolidColor(ctxt, dstRect, solidColor(), styleColorSpace, op);
213        return;
214    }
215
216    // FIXME: We do not support 'round' or 'space' yet. For now just map them to 'repeat'.
217    if (hRule == RoundTile || hRule == SpaceTile)
218        hRule = RepeatTile;
219    if (vRule == RoundTile || vRule == SpaceTile)
220        vRule = RepeatTile;
221
222    AffineTransform patternTransform = AffineTransform().scaleNonUniform(tileScaleFactor.width(), tileScaleFactor.height());
223
224    // We want to construct the phase such that the pattern is centered (when stretch is not
225    // set for a particular rule).
226    float hPhase = tileScaleFactor.width() * srcRect.x();
227    float vPhase = tileScaleFactor.height() * srcRect.y();
228    float scaledTileWidth = tileScaleFactor.width() * srcRect.width();
229    float scaledTileHeight = tileScaleFactor.height() * srcRect.height();
230    if (hRule == Image::RepeatTile)
231        hPhase -= (dstRect.width() - scaledTileWidth) / 2;
232    if (vRule == Image::RepeatTile)
233        vPhase -= (dstRect.height() - scaledTileHeight) / 2;
234    FloatPoint patternPhase(dstRect.x() - hPhase, dstRect.y() - vPhase);
235
236    drawPattern(ctxt, srcRect, patternTransform, patternPhase, styleColorSpace, op, dstRect);
237
238#if PLATFORM(IOS)
239    startAnimation(DoNotCatchUp);
240#else
241    startAnimation();
242#endif
243}
244
245#if ENABLE(IMAGE_DECODER_DOWN_SAMPLING)
246FloatRect Image::adjustSourceRectForDownSampling(const FloatRect& srcRect, const IntSize& scaledSize) const
247{
248    const FloatSize unscaledSize = size();
249    if (unscaledSize == scaledSize)
250        return srcRect;
251
252    // Image has been down-sampled.
253    float xscale = static_cast<float>(scaledSize.width()) / unscaledSize.width();
254    float yscale = static_cast<float>(scaledSize.height()) / unscaledSize.height();
255    FloatRect scaledSrcRect = srcRect;
256    scaledSrcRect.scale(xscale, yscale);
257
258    return scaledSrcRect;
259}
260#endif
261
262void Image::computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio)
263{
264#if PLATFORM(IOS)
265    intrinsicRatio = originalSize();
266#else
267    intrinsicRatio = size();
268#endif
269    intrinsicWidth = Length(intrinsicRatio.width(), Fixed);
270    intrinsicHeight = Length(intrinsicRatio.height(), Fixed);
271}
272
273}
274