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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 "TransformationMatrix.h"
     43 #include <Application.h>
     44 #include <Bitmap.h>
     45 #include <View.h>
     46 
     47 // This function loads resources from WebKit
     48 Vector<char> loadResourceIntoArray(const char*);
     49 
     50 
     51 namespace WebCore {
     52 
     53 bool FrameData::clear(bool clearMetadata)
     54 {
     55     if (clearMetadata)
     56         m_haveMetadata = false;
     57 
     58     if (m_frame) {
     59         delete m_frame;
     60         m_frame = 0;
     61         m_duration = 0.0f;
     62         m_hasAlpha = true;
     63         return true;
     64     }
     65 
     66     return false;
     67 }
     68 
     69 WTF::PassRefPtr<Image> Image::loadPlatformResource(const char* name)
     70 {
     71     Vector<char> array = loadResourceIntoArray(name);
     72     WTF::PassRefPtr<BitmapImage> image = BitmapImage::create();
     73     RefPtr<SharedBuffer> buffer = SharedBuffer::create(array.data(), array.size());
     74     image->setData(buffer, true);
     75 
     76     return image;
     77 }
     78 
     79 void BitmapImage::initPlatformData()
     80 {
     81 }
     82 
     83 void BitmapImage::invalidatePlatformData()
     84 {
     85 }
     86 
     87 // Drawing Routines
     88 void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dst, const FloatRect& src, ColorSpace styleColorSpace, CompositeOperator op)
     89 {
     90     if (!m_source.initialized())
     91         return;
     92 
     93     // Spin the animation to the correct frame before we try to draw it, so we
     94     // don't draw an old frame and then immediately need to draw a newer one,
     95     // causing flicker and wasting CPU.
     96     startAnimation();
     97 
     98     BBitmap* image = nativeImageForCurrentFrame();
     99     if (!image || !image->IsValid()) // If the image hasn't fully loaded.
    100         return;
    101 
    102     if (mayFillWithSolidColor()) {
    103         fillWithSolidColor(ctxt, dst, solidColor(), styleColorSpace, op);
    104         return;
    105     }
    106 
    107     ctxt->save();
    108     ctxt->setCompositeOperation(op);
    109 
    110     BRect srcRect(src);
    111     BRect dstRect(dst);
    112 
    113     // Test using example site at
    114     // http://www.meyerweb.com/eric/css/edge/complexspiral/demo.html
    115     ctxt->platformContext()->SetDrawingMode(B_OP_ALPHA);
    116     ctxt->platformContext()->DrawBitmapAsync(image, srcRect, dstRect);
    117     ctxt->restore();
    118 
    119     if (imageObserver())
    120         imageObserver()->didDraw(this);
    121 }
    122 
    123 void Image::drawPattern(GraphicsContext* context, const FloatRect& tileRect, const AffineTransform& patternTransform, const FloatPoint& srcPoint, ColorSpace, CompositeOperator op, const FloatRect& dstRect)
    124 {
    125     BBitmap* image = nativeImageForCurrentFrame();
    126     if (!image || !image->IsValid()) // If the image hasn't fully loaded.
    127         return;
    128 
    129     // Figure out if the image has any alpha transparency, we can use faster drawing if not
    130     bool hasAlpha = false;
    131 
    132     uint8* bits = reinterpret_cast<uint8*>(image->Bits());
    133     uint32 width = image->Bounds().IntegerWidth() + 1;
    134     uint32 height = image->Bounds().IntegerHeight() + 1;
    135 
    136     uint32 bytesPerRow = image->BytesPerRow();
    137     for (uint32 y = 0; y < height && !hasAlpha; y++) {
    138         uint8* p = bits;
    139         for (uint32 x = 0; x < width && !hasAlpha; x++) {
    140             hasAlpha = p[3] < 255;
    141             p += 4;
    142         }
    143         bits += bytesPerRow;
    144     }
    145 
    146     context->save();
    147     if (hasAlpha)
    148         context->platformContext()->SetDrawingMode(B_OP_ALPHA);
    149     else
    150         context->platformContext()->SetDrawingMode(B_OP_COPY);
    151     context->clip(enclosingIntRect(dstRect));
    152     float currentW = phase.x();
    153     BRect bTileRect(tileRect);
    154     while (currentW < dstRect.x() + dstRect.width()) {
    155         float currentH = phase.y();
    156         while (currentH < dstRect.y() + dstRect.height()) {
    157             BRect bDstRect(currentW, currentH, currentW + width - 1, currentH + height - 1);
    158             context->platformContext()->DrawBitmapAsync(image, bTileRect, bDstRect);
    159             currentH += height;
    160         }
    161         currentW += width;
    162     }
    163     context->restore();
    164 
    165     if (imageObserver())
    166         imageObserver()->didDraw(this);
    167 }
    168 
    169 void BitmapImage::checkForSolidColor()
    170 {
    171     m_isSolidColor = false;
    172     m_checkedForSolidColor = true;
    173 
    174     if (frameCount() > 1)
    175         return;
    176 
    177     BBitmap* image = getBBitmap();
    178     if (!image || !image->Bounds().IsValid()
    179         || image->Bounds().IntegerWidth() > 0 || image->Bounds().IntegerHeight() > 0) {
    180         return;
    181     }
    182 
    183     m_isSolidColor = true;
    184     uint8* bits = reinterpret_cast<uint8*>(image->Bits());
    185     m_solidColor = Color(bits[2], bits[1], bits[0], bits[3]);
    186 }
    187 
    188 BBitmap* BitmapImage::getBBitmap() const
    189 {
    190     return const_cast<BitmapImage*>(this)->frameAtIndex(0);
    191 }
    192 
    193 } // namespace WebCore
    194 
    195