1/*
2 * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
3 * Copyright (C) 2007 Alp Toker <alp@atoker.com>
4 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "config.h"
29#include "BitmapImage.h"
30
31#if USE(CAIRO)
32
33#include "AffineTransform.h"
34#include "CairoUtilities.h"
35#include "Color.h"
36#include "ContextShadow.h"
37#include "FloatRect.h"
38#include "GraphicsContext.h"
39#include "PlatformContextCairo.h"
40#include "ImageBuffer.h"
41#include "ImageObserver.h"
42#include "RefPtrCairo.h"
43#include <cairo.h>
44#include <math.h>
45#include <wtf/OwnPtr.h>
46
47namespace WebCore {
48
49bool FrameData::clear(bool clearMetadata)
50{
51    if (clearMetadata)
52        m_haveMetadata = false;
53
54    if (m_frame) {
55        cairo_surface_destroy(m_frame);
56        m_frame = 0;
57        return true;
58    }
59    return false;
60}
61
62BitmapImage::BitmapImage(cairo_surface_t* surface, ImageObserver* observer)
63    : Image(observer)
64    , m_currentFrame(0)
65    , m_frames(0)
66    , m_frameTimer(0)
67    , m_repetitionCount(cAnimationNone)
68    , m_repetitionCountStatus(Unknown)
69    , m_repetitionsComplete(0)
70    , m_isSolidColor(false)
71    , m_checkedForSolidColor(false)
72    , m_animationFinished(true)
73    , m_allDataReceived(true)
74    , m_haveSize(true)
75    , m_sizeAvailable(true)
76    , m_decodedSize(0)
77    , m_haveFrameCount(true)
78    , m_frameCount(1)
79{
80    initPlatformData();
81
82    // TODO: check to be sure this is an image surface
83
84    int width = cairo_image_surface_get_width(surface);
85    int height = cairo_image_surface_get_height(surface);
86    m_decodedSize = width * height * 4;
87    m_size = IntSize(width, height);
88
89    m_frames.grow(1);
90    m_frames[0].m_frame = surface;
91    m_frames[0].m_hasAlpha = cairo_surface_get_content(surface) != CAIRO_CONTENT_COLOR;
92    m_frames[0].m_haveMetadata = true;
93    checkForSolidColor();
94}
95
96void BitmapImage::draw(GraphicsContext* context, const FloatRect& dst, const FloatRect& src, ColorSpace styleColorSpace, CompositeOperator op)
97{
98    FloatRect srcRect(src);
99    FloatRect dstRect(dst);
100
101    if (dstRect.width() == 0.0f || dstRect.height() == 0.0f ||
102        srcRect.width() == 0.0f || srcRect.height() == 0.0f)
103        return;
104
105    startAnimation();
106
107    cairo_surface_t* image = frameAtIndex(m_currentFrame);
108    if (!image) // If it's too early we won't have an image yet.
109        return;
110
111    if (mayFillWithSolidColor()) {
112        fillWithSolidColor(context, dstRect, solidColor(), styleColorSpace, op);
113        return;
114    }
115
116    IntSize selfSize = size();
117
118    cairo_t* cr = context->platformContext()->cr();
119    context->save();
120
121    // Set the compositing operation.
122    if (op == CompositeSourceOver && !frameHasAlphaAtIndex(m_currentFrame))
123        context->setCompositeOperation(CompositeCopy);
124    else
125        context->setCompositeOperation(op);
126
127    // If we're drawing a sub portion of the image or scaling then create
128    // a pattern transformation on the image and draw the transformed pattern.
129    // Test using example site at http://www.meyerweb.com/eric/css/edge/complexspiral/demo.html
130    cairo_pattern_t* pattern = cairo_pattern_create_for_surface(image);
131
132    cairo_pattern_set_extend(pattern, CAIRO_EXTEND_PAD);
133
134    float scaleX = srcRect.width() / dstRect.width();
135    float scaleY = srcRect.height() / dstRect.height();
136    cairo_matrix_t matrix = { scaleX, 0, 0, scaleY, srcRect.x(), srcRect.y() };
137    cairo_pattern_set_matrix(pattern, &matrix);
138
139    ContextShadow* shadow = context->contextShadow();
140    ASSERT(shadow);
141    if (shadow->m_type != ContextShadow::NoShadow) {
142        cairo_t* shadowContext = shadow->beginShadowLayer(context, dstRect);
143        if (shadowContext) {
144            cairo_translate(shadowContext, dstRect.x(), dstRect.y());
145            cairo_set_source(shadowContext, pattern);
146            cairo_rectangle(shadowContext, 0, 0, dstRect.width(), dstRect.height());
147            cairo_fill(shadowContext);
148            shadow->endShadowLayer(context);
149        }
150    }
151
152    // Draw the image.
153    cairo_translate(cr, dstRect.x(), dstRect.y());
154    cairo_set_source(cr, pattern);
155    cairo_pattern_destroy(pattern);
156    cairo_rectangle(cr, 0, 0, dstRect.width(), dstRect.height());
157    cairo_clip(cr);
158    cairo_paint_with_alpha(cr, context->getAlpha());
159
160    context->restore();
161
162    if (imageObserver())
163        imageObserver()->didDraw(this);
164}
165
166void Image::drawPattern(GraphicsContext* context, const FloatRect& tileRect, const AffineTransform& patternTransform,
167                        const FloatPoint& phase, ColorSpace colorSpace, CompositeOperator op, const FloatRect& destRect)
168{
169    cairo_surface_t* image = nativeImageForCurrentFrame();
170    if (!image) // If it's too early we won't have an image yet.
171        return;
172
173    cairo_t* cr = context->platformContext()->cr();
174    drawPatternToCairoContext(cr, image, size(), tileRect, patternTransform, phase, toCairoOperator(op), destRect);
175
176    if (imageObserver())
177        imageObserver()->didDraw(this);
178}
179
180void BitmapImage::checkForSolidColor()
181{
182    m_isSolidColor = false;
183    m_checkedForSolidColor = true;
184
185    if (frameCount() > 1)
186        return;
187
188    cairo_surface_t* frameSurface = frameAtIndex(0);
189    if (!frameSurface)
190        return;
191
192    ASSERT(cairo_surface_get_type(frameSurface) == CAIRO_SURFACE_TYPE_IMAGE);
193
194    int width = cairo_image_surface_get_width(frameSurface);
195    int height = cairo_image_surface_get_height(frameSurface);
196
197    if (width != 1 || height != 1)
198        return;
199
200    unsigned* pixelColor = reinterpret_cast<unsigned*>(cairo_image_surface_get_data(frameSurface));
201    m_solidColor = colorFromPremultipliedARGB(*pixelColor);
202
203    m_isSolidColor = true;
204}
205
206}
207
208#endif // USE(CAIRO)
209