前几天一直在折腾图片的东西,一直觉得BREW对PNG的支持不是太好,除了显示没有其它什么可操作的了。
其实用IDisplay接口的SetDestination方法是可以方便地实现两种图片的转换,除了速度有点慢而已。
代码并不复杂,如下:
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IBitmap * getBitmapHalf(DisplayWeb *pMe,IImage *pImage)
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{
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IBitmap *pScreen,*pBitmap,*pBitmap2;
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ITransform *pTransform;
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AEEImageInfo info;
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IIMAGE_GetInfo(pImage,&info);
8![](/Images/OutliningIndicators/InBlock.gif)
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pScreen=IDISPLAY_GetDestination(pMe->pApp->a.m_pIDisplay);
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if(pScreen)
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{
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IBITMAP_CreateCompatibleBitmap(pScreen,&pBitmap,info.cx,info.cy);
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IBITMAP_CreateCompatibleBitmap(pScreen,&pBitmap2,info.cx,info.cy);
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if(pBitmap && pBitmap2)
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{
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IDISPLAY_SetDestination(pMe->pApp->a.m_pIDisplay,pBitmap);
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IIMAGE_Draw(pImage,0,0);
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IBITMAP_QueryInterface(pBitmap2,AEECLSID_TRANSFORM,(void*)(ITransform**)&pTransform);
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if(pTransform)
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{
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ITRANSFORM_TransformBltSimple(pTransform,0,0,pBitmap,0,0,info.cx,info.cy,TRANSFORM_SCALE_HALF,COMPOSITE_KEYCOLOR);
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ITRANSFORM_Release(pTransform);
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}
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else
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IBITMAP_BltIn(pBitmap2,0,0,info.cx/2,info.cy/2,pBitmap,0,0,AEE_RO_COPY);
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IDISPLAY_SetDestination(pMe->pApp->a.m_pIDisplay,NULL);
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IBITMAP_Release(pBitmap);
31![](/Images/OutliningIndicators/InBlock.gif)
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}
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IBITMAP_Release(pScreen);
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}
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return pBitmap2;
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}
![](/Images/OutliningIndicators/None.gif)
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![](/Images/OutliningIndicators/ExpandedBlockStart.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/ExpandedSubBlockEnd.gif)
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![](/Images/OutliningIndicators/InBlock.gif)
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![](/Images/OutliningIndicators/ExpandedBlockEnd.gif)
很好理解,就是从屏幕创建两个兼容的Bitmap,然后其中一个作为绘图的目标,将png绘上去,另一个作为转换变形的目标,将前一个(绘有png图的)bitmap用ITransform接口进行变换,返回第二个bitmap即可。