1/*
2 * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
3 * Copyright (C) 2004, 2005, 2006 Apple Computer, 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 COMPUTER, 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 COMPUTER, 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 "IntRect.h"
34#include "MIMETypeRegistry.h"
35#include <wtf/StdLibExtras.h>
36
37#include <math.h>
38
39#if PLATFORM(CG)
40#include <CoreFoundation/CoreFoundation.h>
41#endif
42
43namespace WebCore {
44
45Image::Image(ImageObserver* observer)
46    : m_imageObserver(observer)
47{
48}
49
50Image::~Image()
51{
52}
53
54Image* Image::nullImage()
55{
56    DEFINE_STATIC_LOCAL(RefPtr<Image>, nullImage, (BitmapImage::create()));;
57    return nullImage.get();
58}
59
60bool Image::supportsType(const String& type)
61{
62    return MIMETypeRegistry::isSupportedImageResourceMIMEType(type);
63}
64
65bool Image::setData(PassRefPtr<SharedBuffer> data, bool allDataReceived)
66{
67    m_data = data;
68    if (!m_data.get())
69        return true;
70
71    int length = m_data->size();
72    if (!length)
73        return true;
74
75    return dataChanged(allDataReceived);
76}
77
78void Image::fillWithSolidColor(GraphicsContext* ctxt, const FloatRect& dstRect, const Color& color, ColorSpace styleColorSpace, CompositeOperator op)
79{
80    if (color.alpha() <= 0)
81        return;
82
83    ctxt->save();
84    ctxt->setCompositeOperation(!color.hasAlpha() && op == CompositeSourceOver ? CompositeCopy : op);
85    ctxt->fillRect(dstRect, color, styleColorSpace);
86    ctxt->restore();
87}
88
89static inline FloatSize calculatePatternScale(const FloatRect& dstRect, const FloatRect& srcRect, Image::TileRule hRule, Image::TileRule vRule)
90{
91    float scaleX = 1.0f, scaleY = 1.0f;
92
93    if (hRule == Image::StretchTile)
94        scaleX = dstRect.width() / srcRect.width();
95    if (vRule == Image::StretchTile)
96        scaleY = dstRect.height() / srcRect.height();
97
98    if (hRule == Image::RepeatTile)
99        scaleX = scaleY;
100    if (vRule == Image::RepeatTile)
101        scaleY = scaleX;
102
103    return FloatSize(scaleX, scaleY);
104}
105
106
107void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& destRect, const FloatPoint& srcPoint, const FloatSize& scaledTileSize, ColorSpace styleColorSpace, CompositeOperator op)
108{
109    if (mayFillWithSolidColor()) {
110        fillWithSolidColor(ctxt, destRect, solidColor(), styleColorSpace, op);
111        return;
112    }
113
114    FloatSize intrinsicTileSize = size();
115    if (hasRelativeWidth())
116        intrinsicTileSize.setWidth(scaledTileSize.width());
117    if (hasRelativeHeight())
118        intrinsicTileSize.setHeight(scaledTileSize.height());
119
120    FloatSize scale(scaledTileSize.width() / intrinsicTileSize.width(),
121                    scaledTileSize.height() / intrinsicTileSize.height());
122
123    FloatRect oneTileRect;
124    oneTileRect.setX(destRect.x() + fmodf(fmodf(-srcPoint.x(), scaledTileSize.width()) - scaledTileSize.width(), scaledTileSize.width()));
125    oneTileRect.setY(destRect.y() + fmodf(fmodf(-srcPoint.y(), scaledTileSize.height()) - scaledTileSize.height(), scaledTileSize.height()));
126    oneTileRect.setSize(scaledTileSize);
127
128    // Check and see if a single draw of the image can cover the entire area we are supposed to tile.
129    if (oneTileRect.contains(destRect)) {
130        FloatRect visibleSrcRect;
131        visibleSrcRect.setX((destRect.x() - oneTileRect.x()) / scale.width());
132        visibleSrcRect.setY((destRect.y() - oneTileRect.y()) / scale.height());
133        visibleSrcRect.setWidth(destRect.width() / scale.width());
134        visibleSrcRect.setHeight(destRect.height() / scale.height());
135        draw(ctxt, destRect, visibleSrcRect, styleColorSpace, op);
136        return;
137    }
138
139    AffineTransform patternTransform = AffineTransform().scaleNonUniform(scale.width(), scale.height());
140    FloatRect tileRect(FloatPoint(), intrinsicTileSize);
141    drawPattern(ctxt, tileRect, patternTransform, oneTileRect.location(), styleColorSpace, op, destRect);
142
143    startAnimation();
144}
145
146// FIXME: Merge with the other drawTiled eventually, since we need a combination of both for some things.
147void Image::drawTiled(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, TileRule hRule, TileRule vRule, ColorSpace styleColorSpace, CompositeOperator op)
148{
149    if (mayFillWithSolidColor()) {
150        fillWithSolidColor(ctxt, dstRect, solidColor(), styleColorSpace, op);
151        return;
152    }
153
154    // FIXME: We do not support 'round' yet.  For now just map it to 'repeat'.
155    if (hRule == RoundTile)
156        hRule = RepeatTile;
157    if (vRule == RoundTile)
158        vRule = RepeatTile;
159
160    FloatSize scale = calculatePatternScale(dstRect, srcRect, hRule, vRule);
161    AffineTransform patternTransform = AffineTransform().scaleNonUniform(scale.width(), scale.height());
162
163    // We want to construct the phase such that the pattern is centered (when stretch is not
164    // set for a particular rule).
165    float hPhase = scale.width() * srcRect.x();
166    float vPhase = scale.height() * srcRect.y();
167    if (hRule == Image::RepeatTile)
168        hPhase -= fmodf(dstRect.width(), scale.width() * srcRect.width()) / 2.0f;
169    if (vRule == Image::RepeatTile)
170        vPhase -= fmodf(dstRect.height(), scale.height() * srcRect.height()) / 2.0f;
171    FloatPoint patternPhase(dstRect.x() - hPhase, dstRect.y() - vPhase);
172
173    drawPattern(ctxt, srcRect, patternTransform, patternPhase, styleColorSpace, op, dstRect);
174
175    startAnimation();
176}
177
178
179}
180