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      1 /*
      2  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
      3  * Copyright (C) 2007 Alp Toker <alp (at) atoker.com>
      4  * Copyright (C) 2009 Dirk Schulze <krit (at) 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 
     47 namespace WebCore {
     48 
     49 bool 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 
     62 BitmapImage::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 
     96 void 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 
    166 void 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 
    180 void 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