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参考文章

• 解码带压缩形式的Bitmap(BMP)图像并使用Python可视化解码后实际图像
• 在CodeBlocks搭建SDL2工程构建TFT彩屏模拟器虚拟TFT彩屏幕显示
• 使用Python可视化有压缩格式的Bitmap(BMP)图像调色板数据
• 有压缩格式的Bitmap(BMP)图像显示调色板数据和图像数据
• Bitmap(BMP)图像信息分析主要说明带压缩的形式
• Bitmap(BMP)图像信息验证

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文章说明

    1. 在CodeBlocks上搭建SDL2工程，虚拟TFT彩屏模拟器2. 带压缩的Bitmap(BMP)图像解码后显示在TFT彩屏上3. Bitmap(BMP)原图垂直翻转后为真实样子

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一、创建和退出SDL2

static AppGlobal_TypeDef AppSystem = {0};
AppGlobal_TypeDef * pAppSystem = &AppSystem;/* 初始化SDL */
static u8 ubInit_SDL2(void)
{/* 初始化SDL */if (SDL_Init(SDL_INIT_AUDIO | SDL_INIT_VIDEO) < 0){SDL_Log("SDL Init Fail......%s\r\n", SDL_GetError());return 1;}/* 创建窗口 */AppSystem.MainWindow = SDL_CreateWindow("Virtual TFT SDL2", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, WINDOW_PHY_WIDTH, WINDOW_PHY_HEIGHT, SDL_WINDOW_SHOWN);if (AppSystem.MainWindow == NULL){SDL_Log("SDL Create Window Fail......%s\r\n", SDL_GetError());return 2;}/* 创建渲染器 */AppSystem.MainRender = SDL_CreateRenderer(AppSystem.MainWindow, -1, SDL_RENDERER_ACCELERATED);if (AppSystem.MainRender == NULL){SDL_Log("SDL Create Renderer Fail......%s", SDL_GetError());return 3;}/* 创建纹理 */AppSystem.MainTexture = SDL_CreateTexture(AppSystem.MainRender, SDL_PIXELFORMAT_ARGB8888 , SDL_TEXTUREACCESS_STATIC, TFT_LCD_PHY_XWIDTH, TFT_LCD_PHY_YHEIGHT);if (AppSystem.MainTexture == NULL){SDL_Log("SDL Create Texture Fail......%s", SDL_GetError());return 4;}/* 设置纹理模式 */SDL_SetTextureBlendMode(AppSystem.MainTexture, SDL_BLENDMODE_BLEND);memset(TFT_LCD_DIS_MEMORY, 0x99, TFT_LCD_PHY_XWIDTH * TFT_LCD_PHY_YHEIGHT * sizeof(u32));SDL_UpdateTexture(AppSystem.MainTexture, NULL, TFT_LCD_DIS_MEMORY, TFT_LCD_PHY_XWIDTH * sizeof(u32));SDL_RenderClear(AppSystem.MainRender);SDL_RenderCopy(AppSystem.MainRender, AppSystem.MainTexture, NULL, NULL);SDL_RenderPresent(AppSystem.MainRender);return 0;
}/* 退出SDL */
static void vQuit_SDL2(void)
{SDL_Log("Complier Date: %s  %s %d\r\n", __DATE__, __TIME__, ulSuperTimer_GetTick());/* 销毁纹理 */if (AppSystem.MainTexture != NULL) SDL_DestroyTexture(AppSystem.MainTexture);/* 销毁渲染器 */if (AppSystem.MainRender != NULL)  SDL_DestroyRenderer(AppSystem.MainRender);/* 销毁窗口 */if (AppSystem.MainWindow != NULL) SDL_DestroyWindow(AppSystem.MainWindow);/* 退出SDL */SDL_Quit();
}

二、 Bitmap(BMP)图片解码图

/* 获取调色板数据 */
void vGet_Color_Palette(const u8 * pSrcDat, u32 * pColorDat, u16 count)
{u16 i = 0;u32 * pARGB = (u32 *)(pSrcDat + sizeof(BitmapInfo_TypeDef));for (i = 0; i < count; ++i){pColorDat[i] = *pARGB++;}
}/* 解码数据写入文件中 */
static void vBitmap_Write_File(void)
{u32 i = 0;/* 将解码后数据写入文件中 */FILE * wFileHandler= fopen("xDemo.txt", "a+");  if (wFileHandler == NULL) {printf("Open File Error......\n");return;}fprintf(wFileHandler, "Width:%u Height:%u\n", AppBmpDecode->pBmpInfo->InfoHeader.ImgWidth, AppBmpDecode->pBmpInfo->InfoHeader.ImgHeight);for (i = 0; i < AppBmpDecode->Index; ++i){if (i && ((i % 10) == 0)) fprintf(wFileHandler, "\n");fprintf(wFileHandler, "'#%08X',", AppBmpDecode->pDisMemory[i]);}fprintf(wFileHandler, "\r\n\r\n");if (wFileHandler == NULL) {fclose(wFileHandler);}
}/* Bitmap图片解码 */
void vDecode_Bitmap(const u8 * pSrcDat)
{const u8 * pDat = NULL;Type8Bits_TypeDef bitDat = {0};BitmapInfo_TypeDef bitmapInfo = {0};u32 widthCount = 0, heightCount = 0;u32 color  = 0, temp = 0;u16 i = 0, num = 0, count = 0;u16 line = 0, colum = 0;/* 获取Bitmap信息 */memcpy((void *)(&bitmapInfo), (const void *)pSrcDat, sizeof(BitmapInfo_TypeDef));/* 获取调色板数据 */vGet_Color_Palette(pSrcDat, AppBmpDecode->pColorPalette, bitmapInfo.InfoHeader.ColorPalette);/* 显示调色板数据 */// vShow_Color_Palette(AppBmpDecode->pColorPalette, bitmapInfo.InfoHeader.ColorPalette);/* 颜色数据 */pDat = pSrcDat + bitmapInfo.FileHeader.ImgDataOffset;/* 解码索引 */AppBmpDecode->Index = 0;while(1){if (*pDat == 0){pDat++;switch (*pDat){case 0x00: //00 00 行结束{pDat++;/* 宽度计数不够 */if (bitmapInfo.InfoHeader.ImgWidth >= widthCount){/* 剩余的宽度部分 */temp = bitmapInfo.InfoHeader.ImgWidth - widthCount;if (!bitDat.Bits.Bit0){bitDat.Bits.Bit0 = 1;// printf("Tips2......%u\r\n", AppBmpDecode->Index);}}else{/* 宽度计数超过图像宽度 剩余的宽度部分计算 */temp = bitmapInfo.InfoHeader.ImgWidth - (widthCount % bitmapInfo.InfoHeader.ImgWidth);/* 跨宽度的高度数量 */heightCount += (widthCount / bitmapInfo.InfoHeader.ImgWidth);if (!bitDat.Bits.Bit1){bitDat.Bits.Bit1 = 1;// printf("Tips3......%u\r\n", AppBmpDecode->Index);}}/* 增加高度计数 */heightCount++;/* 高度计数已大于图像高度，提前结束 */if (heightCount >= bitmapInfo.InfoHeader.ImgHeight){bitDat.Bits.Bit7 = 1;// printf("Tips5......%u\r\n", AppBmpDecode->Index);}/* 清零宽度计数 */widthCount = 0;/* 剩余的宽度部分需填充颜色 */AppBmpDecode->Index += temp;}break;case 0x01: //00 01 图像结束{/* 计算剩余需要填充的像素点大小 */temp   = (bitmapInfo.InfoHeader.ImgHeight - heightCount - 1) * bitmapInfo.InfoHeader.ImgWidth + (bitmapInfo.InfoHeader.ImgWidth - widthCount);// temp   = (bitmapInfo.InfoHeader.ImgHeight * bitmapInfo.InfoHeader.ImgWidth) - AppBmpDecode->Index;// printf("Tips4......%u  ", AppBmpDecode->Index);AppBmpDecode->Index += temp;bitDat.Bits.Bit7 = 1;// printf("%u %u %u\r\n", AppBmpDecode->Index, heightCount, temp);}break;case 0x02: //00 02 跳转水平和垂直偏移量{colum = *(pDat + 1); //xline  = *(pDat + 2); //ypDat  += 3;/* 宽度计数 */widthCount  += colum;/* 高度计数 */heightCount += line;// if (!bitDat.Bits.Bit2) printf("Tips1......index0:%u  ", AppBmpDecode->Index);/* 跳转到指定位置 */AppBmpDecode->Index += bitmapInfo.InfoHeader.ImgWidth * line + colum;// if (!bitDat.Bits.Bit2)// {//     bitDat.Bits.Bit2 = 1;//     printf("index0:%u  %u  %u  %u  %u\r\n", AppBmpDecode->Index, colum, line, bitmapInfo.InfoHeader.ImgWidth, bitmapInfo.InfoHeader.ImgHeight);// }}break;default: //00 03~FF 单像素数量+调色板索引{count = num = *pDat;widthCount += num;pDat++;for (i = 0; i < num; ++i){/* 单像素颜色 */AppBmpDecode->pDisMemory[AppBmpDecode->Index++] = AppBmpDecode->pColorPalette[*pDat++];}/* 对齐 */if (count & 0x01){pDat++;}}break;}}else{count = *pDat;color = AppBmpDecode->pColorPalette[*(pDat + 1)];widthCount += count;pDat += 2;for (i = 0; i < count; ++i){AppBmpDecode->pDisMemory[AppBmpDecode->Index++] = color;}}/* 结束 */if (bitDat.Bits.Bit7) {break;}}/* 解码数据写入文件中 */// vBitmap_Write_File();
}

三、Bitmap解码初始化

/* 初始化Bitmap解码 */
void vInit_Bitmap_Decode(void)
{BitmapDecode.pDisMemory    = BitmapDecodeDisplayMemory;BitmapDecode.pColorPalette = BitmapDecodeColorPalette;BitmapDecode.pImageData    = BitmapDecodeImageData;BitmapDecode.pBmpInfo      = &BitmapDecodeBitmapInfo;BitmapDecode.Index         = 0;AppBmpDecode = (BitmapDecode_TypeDef *)(&BitmapDecode);
}void vClear_BmpDecode_Memory(void)
{memset((void *)BitmapDecode.pDisMemory,    0, (BMP_DECODE_DISPLAY_MEMORY_SIZE << 2));memset((void *)BitmapDecode.pColorPalette, 0, (BMP_DECODE_COLOR_PALETTE_SIZE << 2));memset((void *)BitmapDecode.pImageData,    0, BMP_DECODE_IMAGE_DATA_SIZE);memset((void *)BitmapDecode.pBmpInfo,      0, sizeof(BitmapInfo_TypeDef));BitmapDecode.Index = 0;
}

四、测试代码

void vTFT_LCD_FillRect_MultColor1(u32 x, u32 y, u32 width, u32 height, ColorType * pColor)
{u32 count = 0;u32 x0 = 0, y0 = 0, ex = 0, ey = 0;for (y0 = y; y0 <= (y + height - 1); y0++){for (x0 = x; x0 <= (x + width - 1); x0++){AppDevTFT.pDisMem[AppDevTFT.xWidth * y0 + x0] = 0xFF000000 | DEV_RGB(*pColor++);count++;}}printf("width:%-5u height:%-5u count:%-5u   X:%-5u Y:%-5u\r\n", width, height, count, x0, y0);
}const u8 * xDat[12] = 
{(const u8 *)"xDemoUI\\b128_t_vol3.bmp",(const u8 *)"xDemoUI\\b064_p_delay.bmp",(const u8 *)"xDemoUI\\b089_td_meas.bmp",(const u8 *)"xDemoUI\\b112_t_p2p2.bmp",(const u8 *)"xDemoUI\\b110_t_level.bmp",(const u8 *)"xDemoUI\\b106_t_area1.bmp",(const u8 *)"xDemoUI\\b101_t_2pyth2.bmp",(const u8 *)"xDemoUI\\b380_td_contmeas.bmp",(const u8 *)"xDemoUI\\b109_t_cylin2.bmp",(const u8 *)"xDemoUI\\b127_t_vol2.bmp",(const u8 *)"xDemoUI\\b042_m_stake2.bmp",(const u8 *)"xDemoUI\\b120_t_trapz2.bmp",
};void vDemoTest(void)
{static u8 count = 0;const u8 * pSrcDir = NULL;FILE * pImgFileHandler = NULL;pSrcDir = xDat[count];if ((++count) >= 12) count = 0;/* 打开文件 */pImgFileHandler = fopen(pSrcDir, "rb");if (pImgFileHandler == NULL) {printf("Open File Error......\r\n");while (1); }vClear_BmpDecode_Memory();/* 读取Bitmap信息 */if (!fread(AppBmpDecode->pBmpInfo, sizeof(BitmapInfo_TypeDef), 1, pImgFileHandler)) {printf("Read Bitmap Info Error......\r\n");while (1);}/* 设置文件指针偏移 */if (fseek(pImgFileHandler, 0, SEEK_SET)){printf("Set Offset Error.....1\r\n");while (1);}/* 读取整个文件内容 */if (!fread(AppBmpDecode->pImageData, AppBmpDecode->pBmpInfo->FileHeader.FileSize, 1, pImgFileHandler)) {printf("Read File Data Error......2\r\n");while (1);}vTFT_LCD_FillRect_SingColor(10, 50, AppDevTFT.xWidth - 10, AppDevTFT.yHeight - 10, 0);vDecode_Bitmap((const u8 *)AppBmpDecode->pImageData);vTFT_LCD_FillRect_MultColor1(30, 60, AppBmpDecode->pBmpInfo->InfoHeader.ImgWidth, AppBmpDecode->pBmpInfo->InfoHeader.ImgHeight, AppBmpDecode->pDisMemory);ubSuperTimer_Start(vDemoTest, 1500);
}

五、主函数

int main( int argc, char * argv[] )
{if (ubInit_SDL2()){SDL_Log("Init SDL Fail......%s\r\n", SDL_GetError());vQuit_SDL2();return -1;}vTFT_Init();xSuperTimer_Init();vInit_Bitmap_Decode();AppSystem.ExitWindow = EXIT_WINDOW_TYPE_RUN;ubSuperTimer_Start(xDemo, 3000);while (AppSystem.ExitWindow){vRefresh_KeyEvent_Handler();vSystem_BasicTick();vSuperTimer_RunHandler();}vQuit_SDL2();return 0;
}

六、测试结果