bitmap convert to RGB565 display

最新推荐文章于 2024-02-07 15:28:39 发布

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本文介绍如何在RGB888格式与RGB565格式之间进行颜色空间的转换。详细展示了通过位操作实现颜色通道的提取和放大，包括从RGB565到RGB888以及从RGB888到RGB565的转换方法。

bitmap图片是一个RGB888，每个像素由3个字节组成，R->8bit，G->8bit，B->8bit；

RGB565 的每个pixels是由2字节组成，R->5bit，G->6bit，B->5bit。

转换的思路是取出原图的点，对没个采样进行运算。

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#define RGB565_MASK_RED 0xF800
#define RGB565_MASK_GREEN 0x07E0
#define RGB565_MASK_BLUE 0x001F
void rgb565_2_rgb24( BYTE *rgb24, WORD rgb565)
{
//extract RGB
rgb24[2] = (rgb565 & RGB565_MASK_RED) >> 11;
rgb24[1] = (rgb565 & RGB565_MASK_GREEN) >> 5;
rgb24[0] = (rgb565 & RGB565_MASK_BLUE);
//amplify the image
rgb24[2] <<= 3;
rgb24[1] <<= 2;
rgb24[0] <<= 3;
}

#define RGB565_MASK_RED 0xF800 #define RGB565_MASK_GREEN 0x07E0 #define RGB565_MASK_BLUE 0x001F void rgb565_2_rgb24(BYTE *rgb24, WORD rgb565) { //extract RGB rgb24[2] = (rgb565 & RGB565_MASK_RED) >> 11; rgb24[1] = (rgb565 & RGB565_MASK_GREEN) >> 5; rgb24[0] = (rgb565 & RGB565_MASK_BLUE); //amplify the image rgb24[2] <<= 3; rgb24[1] <<= 2; rgb24[0] <<= 3; }

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USHORT rgb_24_2_565( int r, int g, int b)
{
return ( USHORT )(((unsigned(r) << 8) & 0xF800) |
((unsigned(g) << 3) & 0x7E0) |
((unsigned(b) >> 3)));
}

USHORT rgb_24_2_565(int r, int g, int b) { return (USHORT)(((unsigned(r) << 8) & 0xF800) | ((unsigned(g) << 3) & 0x7E0) | ((unsigned(b) >> 3))); }

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USHORT rgb_24_2_555( int r, int g, int b)
{
return ( USHORT )(((unsigned(r) << 7) & 0x7C00) |
((unsigned(g) << 2) & 0x3E0) |
((unsigned(b) >> 3)));
}
COLORREF rgb_555_2_24( int rgb555)
{
unsigned r = ((rgb555 >> 7) & 0xF8);
unsigned g = ((rgb555 >> 2) & 0xF8);
unsigned b = ((rgb555 << 3) & 0xF8);
return RGB(r,g,b);
}
void rgb_555_2_bgr24( BYTE * p, int rgb555)
{
p[0] = ((rgb555 << 3) & 0xF8);
p[1] = ((rgb555 >> 2) & 0xF8);
p[2] = ((rgb555 >> 7) & 0xF8);
}

USHORT rgb_24_2_555(int r, int g, int b) { return (USHORT)(((unsigned(r) << 7) & 0x7C00) | ((unsigned(g) << 2) & 0x3E0) | ((unsigned(b) >> 3))); } COLORREF rgb_555_2_24(int rgb555) { unsigned r = ((rgb555 >> 7) & 0xF8); unsigned g = ((rgb555 >> 2) & 0xF8); unsigned b = ((rgb555 << 3) & 0xF8); return RGB(r,g,b); } void rgb_555_2_bgr24(BYTE* p, int rgb555) { p[0] = ((rgb555 << 3) & 0xF8); p[1] = ((rgb555 >> 2) & 0xF8); p[2] = ((rgb555 >> 7) & 0xF8); }

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http://blog.youkuaiyun.com/nitghost/archive/2009/02/23/3925678.aspx