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      1 /*
      2  * Copyright (C) 2006 Dirk Mueller <mueller (at) kde.org>
      3  * Copyright (C) 2006 Zack Rusin <zack (at) kde.org>
      4  * Copyright (C) 2006 Simon Hausmann <hausmann (at) kde.org>
      5  * Copyright (C) 2007 Ryan Leavengood <leavengood (at) gmail.com>
      6  * Copyright (C) 2008 Andrea Anzani <andrea.anzani (at) gmail.com>
      7  * Copyright (C) 2010 Stephan Amus <superstippi (at) gmx.de>
      8  *
      9  * All rights reserved.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     21  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     28  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #include "config.h"
     34 #include "Image.h"
     35 
     36 #include "BitmapImage.h"
     37 #include "FloatRect.h"
     38 #include "GraphicsContext.h"
     39 #include "ImageObserver.h"
     40 #include "NotImplemented.h"
     41 #include "PlatformString.h"
     42 #include "SharedBuffer.h"
     43 #include "TransformationMatrix.h"
     44 #include <Application.h>
     45 #include <Bitmap.h>
     46 #include <View.h>
     47 
     48 // This function loads resources from WebKit
     49 Vector<char> loadResourceIntoArray(const char*);
     50 
     51 
     52 namespace WebCore {
     53 
     54 bool FrameData::clear(bool clearMetadata)
     55 {
     56     if (clearMetadata)
     57         m_haveMetadata = false;
     58 
     59     if (m_frame) {
     60         delete m_frame;
     61         m_frame = 0;
     62         m_duration = 0.0f;
     63         m_hasAlpha = true;
     64         return true;
     65     }
     66 
     67     return false;
     68 }
     69 
     70 WTF::PassRefPtr<Image> Image::loadPlatformResource(const char* name)
     71 {
     72     Vector<char> array = loadResourceIntoArray(name);
     73     WTF::PassRefPtr<BitmapImage> image = BitmapImage::create();
     74     RefPtr<SharedBuffer> buffer = SharedBuffer::create(array.data(), array.size());
     75     image->setData(buffer, true);
     76 
     77     return image;
     78 }
     79 
     80 void BitmapImage::initPlatformData()
     81 {
     82 }
     83 
     84 void BitmapImage::invalidatePlatformData()
     85 {
     86 }
     87 
     88 // Drawing Routines
     89 void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dst, const FloatRect& src, ColorSpace styleColorSpace, CompositeOperator op)
     90 {
     91     if (!m_source.initialized())
     92         return;
     93 
     94     // Spin the animation to the correct frame before we try to draw it, so we
     95     // don't draw an old frame and then immediately need to draw a newer one,
     96     // causing flicker and wasting CPU.
     97     startAnimation();
     98 
     99     BBitmap* image = nativeImageForCurrentFrame();
    100     if (!image || !image->IsValid()) // If the image hasn't fully loaded.
    101         return;
    102 
    103     if (mayFillWithSolidColor()) {
    104         fillWithSolidColor(ctxt, dst, solidColor(), styleColorSpace, op);
    105         return;
    106     }
    107 
    108     ctxt->save();
    109     ctxt->setCompositeOperation(op);
    110 
    111     BRect srcRect(src);
    112     BRect dstRect(dst);
    113 
    114     // Test using example site at
    115     // http://www.meyerweb.com/eric/css/edge/complexspiral/demo.html
    116     ctxt->platformContext()->SetDrawingMode(B_OP_ALPHA);
    117     ctxt->platformContext()->DrawBitmapAsync(image, srcRect, dstRect);
    118     ctxt->restore();
    119 
    120     if (imageObserver())
    121         imageObserver()->didDraw(this);
    122 }
    123 
    124 void Image::drawPattern(GraphicsContext* context, const FloatRect& tileRect, const AffineTransform& patternTransform, const FloatPoint& phase, ColorSpace, CompositeOperator op, const FloatRect& dstRect)
    125 {
    126     BBitmap* image = nativeImageForCurrentFrame();
    127     if (!image || !image->IsValid()) // If the image hasn't fully loaded.
    128         return;
    129 
    130     // Figure out if the image has any alpha transparency, we can use faster drawing if not
    131     bool hasAlpha = false;
    132 
    133     uint8* bits = reinterpret_cast<uint8*>(image->Bits());
    134     uint32 width = image->Bounds().IntegerWidth() + 1;
    135     uint32 height = image->Bounds().IntegerHeight() + 1;
    136 
    137     uint32 bytesPerRow = image->BytesPerRow();
    138     for (uint32 y = 0; y < height && !hasAlpha; y++) {
    139         uint8* p = bits;
    140         for (uint32 x = 0; x < width && !hasAlpha; x++) {
    141             hasAlpha = p[3] < 255;
    142             p += 4;
    143         }
    144         bits += bytesPerRow;
    145     }
    146 
    147     context->save();
    148     if (hasAlpha)
    149         context->platformContext()->SetDrawingMode(B_OP_ALPHA);
    150     else
    151         context->platformContext()->SetDrawingMode(B_OP_COPY);
    152     context->clip(enclosingIntRect(dstRect));
    153     float currentW = phase.x();
    154     BRect bTileRect(tileRect);
    155     while (currentW < dstRect.x() + dstRect.width()) {
    156         float currentH = phase.y();
    157         while (currentH < dstRect.y() + dstRect.height()) {
    158             BRect bDstRect(currentW, currentH, currentW + width - 1, currentH + height - 1);
    159             context->platformContext()->DrawBitmapAsync(image, bTileRect, bDstRect);
    160             currentH += height;
    161         }
    162         currentW += width;
    163     }
    164     context->restore();
    165 
    166     if (imageObserver())
    167         imageObserver()->didDraw(this);
    168 }
    169 
    170 void BitmapImage::checkForSolidColor()
    171 {
    172     m_isSolidColor = false;
    173     m_checkedForSolidColor = true;
    174 
    175     if (frameCount() > 1)
    176         return;
    177 
    178     BBitmap* image = getBBitmap();
    179     if (!image || !image->Bounds().IsValid()
    180         || image->Bounds().IntegerWidth() > 0 || image->Bounds().IntegerHeight() > 0) {
    181         return;
    182     }
    183 
    184     m_isSolidColor = true;
    185     uint8* bits = reinterpret_cast<uint8*>(image->Bits());
    186     m_solidColor = Color(bits[2], bits[1], bits[0], bits[3]);
    187 }
    188 
    189 BBitmap* BitmapImage::getBBitmap() const
    190 {
    191     return const_cast<BitmapImage*>(this)->frameAtIndex(0);
    192 }
    193 
    194 } // namespace WebCore
    195 
    196