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      1 /*
      2  * Copyright (C) 2008 Apple Inc.  All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "Image.h"
     28 #include "BitmapImage.h"
     29 #include "GraphicsContext.h"
     30 #include <cairo.h>
     31 #include <cairo-win32.h>
     32 
     33 #include <windows.h>
     34 #include "PlatformString.h"
     35 
     36 namespace WebCore {
     37 
     38 PassRefPtr<BitmapImage> BitmapImage::create(HBITMAP hBitmap)
     39 {
     40     DIBSECTION dibSection;
     41     if (!GetObject(hBitmap, sizeof(DIBSECTION), &dibSection))
     42         return 0;
     43 
     44     ASSERT(dibSection.dsBm.bmBitsPixel == 32);
     45     if (dibSection.dsBm.bmBitsPixel != 32)
     46         return 0;
     47 
     48     ASSERT(dibSection.dsBm.bmBits);
     49     if (!dibSection.dsBm.bmBits)
     50         return 0;
     51 
     52     cairo_surface_t* image = cairo_win32_surface_create_with_dib (CAIRO_FORMAT_ARGB32, dibSection.dsBm.bmWidth, dibSection.dsBm.bmHeight);
     53 
     54     // The BitmapImage object takes over ownership of the cairo_surface_t*, so no need to destroy here.
     55     return adoptRef(new BitmapImage(image));
     56 }
     57 
     58 bool BitmapImage::getHBITMAPOfSize(HBITMAP bmp, LPSIZE size)
     59 {
     60     ASSERT(bmp);
     61 
     62     BITMAP bmpInfo;
     63     GetObject(bmp, sizeof(BITMAP), &bmpInfo);
     64 
     65     // If this is a 32bpp bitmap, which it always should be, we'll clear it so alpha-wise it will be visible
     66     if (bmpInfo.bmBitsPixel == 32) {
     67         int bufferSize = bmpInfo.bmWidthBytes * bmpInfo.bmHeight;
     68         memset(bmpInfo.bmBits, 255, bufferSize);
     69     }
     70 
     71     cairo_surface_t* image = cairo_image_surface_create_for_data((unsigned char*)bmpInfo.bmBits,
     72                                                CAIRO_FORMAT_ARGB32,
     73                                                bmpInfo.bmWidth,
     74                                                bmpInfo.bmHeight,
     75                                                bmpInfo.bmWidthBytes);
     76 
     77 
     78     cairo_t* targetRef = cairo_create(image);
     79     cairo_surface_destroy(image);
     80 
     81     GraphicsContext gc(targetRef);
     82 
     83     IntSize imageSize = BitmapImage::size();
     84     if (size)
     85         drawFrameMatchingSourceSize(&gc, FloatRect(0.0f, 0.0f, bmpInfo.bmWidth, bmpInfo.bmHeight), IntSize(*size), DeviceColorSpace, CompositeCopy);
     86     else
     87         draw(&gc, FloatRect(0.0f, 0.0f, bmpInfo.bmWidth, bmpInfo.bmHeight), FloatRect(0.0f, 0.0f, imageSize.width(), imageSize.height()), DeviceColorSpace, CompositeCopy);
     88 
     89     // Do cleanup
     90     cairo_destroy(targetRef);
     91 
     92     return true;
     93 }
     94 
     95 void BitmapImage::drawFrameMatchingSourceSize(GraphicsContext* ctxt, const FloatRect& dstRect, const IntSize& srcSize, ColorSpace styleColorSpace, CompositeOperator compositeOp)
     96 {
     97     size_t frames = frameCount();
     98     for (size_t i = 0; i < frames; ++i) {
     99         cairo_surface_t* image = frameAtIndex(i);
    100         if (cairo_image_surface_get_height(image) == static_cast<size_t>(srcSize.height()) && cairo_image_surface_get_width(image) == static_cast<size_t>(srcSize.width())) {
    101             size_t currentFrame = m_currentFrame;
    102             m_currentFrame = i;
    103             draw(ctxt, dstRect, FloatRect(0.0f, 0.0f, srcSize.width(), srcSize.height()), DeviceColorSpace, compositeOp);
    104             m_currentFrame = currentFrame;
    105             return;
    106         }
    107     }
    108 
    109     // No image of the correct size was found, fallback to drawing the current frame
    110     IntSize imageSize = BitmapImage::size();
    111     draw(ctxt, dstRect, FloatRect(0.0f, 0.0f, imageSize.width(), imageSize.height()), DeviceColorSpace, compositeOp);
    112 }
    113 
    114 } // namespace WebCore
    115