atlcimage 的透明通道的处理与格式转换（Processing and format conversion of transparent channel of atlcimage）.docVIP

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2017-07-24 发布于河南
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atlcimage 的透明通道的处理与格式转换（Processing and format conversion of transparent channel of atlcimage）.doc

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atlcimage 的透明通道的处理与格式转换（Processing and format conversion of transparent channel of atlcimage）

atlcimage 的透明通道的处理与格式转换（Processing and format conversion of transparent channel of atlcimage） ATL:: transparent channel processing and format conversion for CImage 1, transparent channel processing: In the management of CImage, (in fact, bitmap processing Windows) mapping function all does not modify the transparent channel values, even if you call TransparentBlt (on the function is very interesting, in does not contain the channel transparent bitmap processing, transparent color filter, or copy the transparent channel to DC), or you can use AlpahBlend, it is directly mixed operation for RGB primary colors, without any treatment, the transparent channel in other words, in 32 bit RGBA bitmap format, all GDI functions are processed as bitmap RGBX format; So create 32 bitmap, contains a transparent channel for drawing, and then save it as JPG format, it seems there is no problem, because the loss of JPG transparent channel, if saved as PNG format, then you will not have to see what, because the transparent channel values are 0, that is to say the whole picture is transparent; In view of this, a PNG format of the map in the store, if a transparent effect, you must manually processing the transparent channel, so when the graph will need to use a transparent part of the future without the use of color to fill, as the transparent color in the future; and then use the GDI to draw a graph, for example the map, and then the transparent channel set all RGB transparent color pixel is equal to the 0 transparent channel of other pixels is set to 0xFF, then saved as PNG format, so it can be placed into the PNG graph in the figure above other transparent display, for example, placed at the bottom of the aerial raster map of the landscape; the function is as follows: Int Windows_Image_Convert:: TransparentImage (CImage Image, COLORREF, Transparent = 0, BYTE, Alpha = 0) { Int, nPitch = Image.GetPitch (), nBPP = Image.GetBPP (); LPBYTE lpBits = reinterpret_cast LPBYTE (Image.GetBits