VOFA+图片格式
图片格式是什么？
当您发送图片时，需要指定一个IMG_FORMAT参数，参数为以下宏定义之一。
如有疑惑，请查看本目录下各个协议的详细说明。
IMG_FORMAT图片格式宏定义
enum ImgFormat {
Format_Invalid,
Format_Mono,
Format_MonoLSB,
Format_Indexed8,
Format_RGB32,
Format_ARGB32,
Format_ARGB32_Premultiplied,
Format_RGB16,
Format_ARGB8565_Premultiplied,
Format_RGB666,
Format_ARGB6666_Premultiplied,
Format_RGB555,
Format_ARGB8555_Premultiplied,
Format_RGB888,
Format_RGB444,
Format_ARGB4444_Premultiplied,
Format_RGBX8888,
Format_RGBA8888,
Format_RGBA8888_Premultiplied,
Format_BGR30,
Format_A2BGR30_Premultiplied,
Format_RGB30,
Format_A2RGB30_Premultiplied,
Format_Alpha8,
Format_Grayscale8,
// 以下格式发送时，IMG_WIDTH和IMG_HEIGHT不需要强制指定，设置为-1即可
Format_BMP,
Format_GIF,
Format_JPG,
Format_PNG,
Format_PBM,
Format_PGM,
Format_PPM,
Format_XBM,
Format_XPM,
Format_SVG,
};
如果发送的是BMP、GIF、JPG、PNG、SVG等，已在数据中包含图片长宽的格式，IMG_WIDTH和IMG_HEIGHT不需要指定，设置为-1即可。
图片格式英文释义
| Constant | Value | Description |
|---|---|---|
| Format_Invalid | 0 | The image is invalid. |
| Format_Mono | 1 | The image is stored using 1-bit per pixel. Bytes are packed with the most significant bit (MSB) first. |
| Format_MonoLSB | 2 | The image is stored using 1-bit per pixel. Bytes are packed with the less significant bit (LSB) first. |
| Format_Indexed8 | 3 | The image is stored using 8-bit indexes into a colormap. |
| Format_RGB32 | 4 | The image is stored using a 32-bit RGB format (0xffRRGGBB). |
| Format_ARGB32 | 5 | The image is stored using a 32-bit ARGB format (0xAARRGGBB). |
| Format_ARGB32_Premultiplied | 6 | The image is stored using a premultiplied 32-bit ARGB format (0xAARRGGBB), i.e. the red, green, and blue channels are multiplied by the alpha component divided by 255. (If RR, GG, or BB has a higher value than the alpha channel, the results are undefined.) Certain operations (such as image composition using alpha blending) are faster using premultiplied ARGB32 than with plain ARGB32. |
| Format_RGB16 | 7 | The image is stored using a 16-bit RGB format (5-6-5). |
| Format_ARGB8565_Premultiplied | 8 | The image is stored using a premultiplied 24-bit ARGB format (8-5-6-5). |
| Format_RGB666 | 9 | The image is stored using a 24-bit RGB format (6-6-6). The unused most significant bits is always zero. |
| Format_ARGB6666_Premultiplied | 10 | The image is stored using a premultiplied 24-bit ARGB format (6-6-6-6). |
| Format_RGB555 | 11 | The image is stored using a 16-bit RGB format (5-5-5). The unused most significant bit is always zero. |
| Format_ARGB8555_Premultiplied | 12 | The image is stored using a premultiplied 24-bit ARGB format (8-5-5-5). |
| Format_RGB888 | 13 | The image is stored using a 24-bit RGB format (8-8-8). |
| Format_RGB444 | 14 | The image is stored using a 16-bit RGB format (4-4-4). The unused bits are always zero. |
| Format_ARGB4444_Premultiplied | 15 | The image is stored using a premultiplied 16-bit ARGB format (4-4-4-4). |
| Format_RGBX8888 | 16 | The image is stored using a 32-bit byte-ordered RGB(x) format (8-8-8-8). This is the same as the Format_RGBA8888 except alpha must always be 255. (added in Qt 5.2) |
| Format_RGBA8888 | 17 | The image is stored using a 32-bit byte-ordered RGBA format (8-8-8-8). Unlike ARGB32 this is a byte-ordered format, which means the 32bit encoding differs between big endian and little endian architectures, being respectively (0xRRGGBBAA) and (0xAABBGGRR). The order of the colors is the same on any architecture if read as bytes 0xRR,0xGG,0xBB,0xAA. (added in Qt 5.2) |
| Format_RGBA8888_Premultiplied | 18 | The image is stored using a premultiplied 32-bit byte-ordered RGBA format (8-8-8-8). (added in Qt 5.2) |
| Format_BGR30 | 19 | The image is stored using a 32-bit BGR format (x-10-10-10). (added in Qt 5.4) |
| Format_A2BGR30_Premultiplied | 20 | The image is stored using a 32-bit premultiplied ABGR format (2-10-10-10). (added in Qt 5.4) |
| Format_RGB30 | 21 | The image is stored using a 32-bit RGB format (x-10-10-10). (added in Qt 5.4) |
| Format_A2RGB30_Premultiplied | 22 | The image is stored using a 32-bit premultiplied ARGB format (2-10-10-10). (added in Qt 5.4) |
| Format_Alpha8 | 23 | The image is stored using an 8-bit alpha only format. (added in Qt 5.5) |
| Format_Grayscale8 | 24 | The image is stored using an 8-bit grayscale format. (added in Qt 5.5) |
| Format_BMP, | 25 | BMP, |
| Format_GIF, | 26 | GIF, |
| Format_JPG, | 27 | JPG, |
| Format_PNG, | 28 | PNG, |
| Format_PBM, | 29 | PBM, |
| Format_PGM, | 30 | PGM, |
| Format_PPM, | 31 | PPM, |
| Format_XBM, | 32 | XBM, |
| Format_XPM, | 33 | FXPM, |
| Format_SVG, | 34 | SVG, |