Create a 16-Bit Bitmap Under wince to implement fast bitblt

If the format of the bitmap created in wince is different from that of the screen device, the bitblt function is extremely slow. Therefore, you need to create a 16-bit color 565 format bitmap, the bitmap created using this method can provide quick bitblt rendering for 1 ms. Of course, if the device is not in the 565 color format, changeCodeIn the Color Mask bits bmicolors.

 

//////////////////////////////////////// /// // <Br/> // // @ brief creates a cached image. <Br/> // @ Param [out] The bitmap handle generated by phbitmap. <Br/> // @ Param [out] The data location in the bitmap generated by pdata. <Br/> // @ Param [in] HDC Target DC handle. <Br/> // @ Param [in] width: the width of the bitmap. <Br/> // @ Param [in] Height: the height of the bitmap. <Br/> // @ Param [in] bitcount the number of bits per pixel. <Br/> // @ attention the created bitmap is in the non-compressed format. <Br/> // @ author loongee <br/> /// @ date 2010/01/15 <br/> //////////////// //////////////////////////////////////// ///// // <br/> void createbufferbitmap (hbitmap * phbitmap, void ** pdata, <br/> HDC, long width, long height, word bitcount) <br/>{< br/> bitmapinfo & BMP info = * (bitmapinfo *) new byte [sizeof (BMP info) + sizeof (rgbquad) * 3]; <br/> BMP info. bmiheader. bisize = sizeof (bitmapinfoheader); <br/> BMP info. bmiheader. biwidth = width; <br/> BMP info. bmiheader. biheight = height; <br/> BMP info. bmiheader. biplanes = 1; <br/> BMP info. bmiheader. bibitcount = bitcount; <br/> If (bitcount = 16) <br/>{< br/> BMP info. bmiheader. bicompression = bi_bitfields; <br/> * (DWORD *) (& BMP info. bmicolors [0]) = 0xf800; <br/> * (DWORD *) (& BMP info. bmicolors [1]) = 0x07e0; <br/> * (DWORD *) (& BMP info. bmicolors [2]) = 0x001f; <br/>}< br/> else <br/>{< br/> BMP info. bmiheader. bicompression = bi_rgb; <br/>}< br/> BMP info. bmiheader. bisizeimage = 0; <br/> BMP info. bmiheader. bixpelspermeter = 1000; <br/> BMP info. bmiheader. biypelspermeter = 1000; <br/> BMP info. bmiheader. biclrused = 0; <br/> BMP info. bmiheader. biclrimportant = 0; <br/> * phbitmap = createdibsection (HDC, & BMP info, dib_rgb_colors <br/>, pdata, null, 0 ); <br/> Delete [] (byte *) & BMP Info; <br/>}