Android 截屏源码

/******************************************************************** created: 2012/02/07 filename: savebmp.c author: purpose: *********************************************************************/ #include <stdlib.h> #include <stdio.h> #include <memory.h> #include "./myfb.h" FILE* tracefp; //------------------------------------------------------------------- /* 　　位图文件的组成 　　结构名称 符 号 　　位图文件头 (bitmap-file header) BITMAPFILEHEADER bmfh 　　位图信息头 (bitmap-information header) BITMAPINFOHEADER bmih 　　彩色表　(color table) RGBQUAD aColors[] 　　图象数据阵列字节 BYTE aBitmapBits[] */ typedef struct bmp_header { short twobyte ;//两个字节，用来保证下面成员紧凑排列，这两个字符不能写到文件中 //14B char bfType[2] ;//!文件的类型,该值必需是0x4D42，也就是字符'BM' unsigned int bfSize ;//!说明文件的大小，用字节为单位 unsigned int bfReserved1;//保留，必须设置为0 unsigned int bfOffBits ;//!说明从文件头开始到实际的图象数据之间的字节的偏移量，这里为14B+sizeof() }BMPHEADER; typedef struct bmp_info { //40B unsigned int biSize ;//!BMPINFO结构所需要的字数 int biWidth ;//!图象的宽度，以象素为单位 int biHeight ;//!图象的宽度，以象素为单位,如果该值是正数，说明图像是倒向的，如果该值是负数，则是正向的 unsigned short biPlanes ;//!目标设备说明位面数，其值将总是被设为1 unsigned short biBitCount ;//!比特数/象素，其值为1、4、8、16、24、或32 unsigned int biCompression ;//说明图象数据压缩的类型 #define BI_RGB 0L //没有压缩 #define BI_RLE8 1L //每个象素8比特的RLE压缩编码，压缩格式由2字节组成（重复象素计数和颜色索引）； #define BI_RLE4 2L //每个象素4比特的RLE压缩编码，压缩格式由2字节组成 #define BI_BITFIELDS 3L //每个象素的比特由指定的掩码决定。 unsigned int biSizeImage ;//图象的大小，以字节为单位。当用BI_RGB格式时，可设置为0 int biXPelsPerMeter ;//水平分辨率，用象素/米表示 int biYPelsPerMeter ;//垂直分辨率，用象素/米表示 unsigned int biClrUsed ;//位图实际使用的彩色表中的颜色索引数（设为0的话，则说明使用所有调色板项） unsigned int biClrImportant ;//对图象显示有重要影响的颜色索引的数目，如果是0，表示都重要。 }BMPINFO; typedef struct tagRGBQUAD { unsigned char rgbBlue; unsigned char rgbGreen; unsigned char rgbRed; unsigned char rgbReserved; } RGBQUAD; typedef struct tagBITMAPINFO { BMPINFO bmiHeader; //RGBQUAD bmiColors[1]; unsigned int rgb[3]; } BITMAPINFO; void android_trace(const char* str,int value){ #if 0 tracefp = fopen("/mnt/sdcard/hyf_trace.txt","at"); if(str!=NULL) fprintf(tracefp,"string = %s, value = %d \n",str,value); else fprintf(tracefp,"value = %d \n",value); fclose(tracefp); #endif printf("%s:%d\n", str, value); } static int get_rgb888_header(int w, int h, BMPHEADER * head, BMPINFO * info,int minusTop, int minusBottom) { int size = 0; if (head && info) { size = w * (h- minusBottom-minusTop)* 3; memset(head, 0, sizeof(* head)); memset(info, 0, sizeof(* info)); head->bfType[0] = 'B'; head->bfType[1] = 'M'; head->bfOffBits = 14 + sizeof(* info); head->bfSize = head->bfOffBits + size; head->bfSize = (head->bfSize + 3) & ~3; size = head->bfSize - head->bfOffBits; info->biSize = sizeof(BMPINFO); info->biWidth = w; info->biHeight = -(h- minusBottom-minusTop); info->biPlanes = 1; info->biBitCount = 24; info->biCompression = BI_RGB; info->biSizeImage = size; printf("rgb888:%dbit,%d*%d,%d\n", info->biBitCount, w, h, head->bfSize); } return size; } static int get_rgb8888_header(int w, int h, BMPHEADER * head, BMPINFO * info,int minusTop, int minusBottom) { int size = 0; printf("w=%d, h=%d, mtop=%d, mbot=%d\n", w, h, minusTop, minusBottom); if (head && info) { size = w * (h- minusTop-minusBottom) * 4; memset(head, 0, sizeof(* head)); memset(info, 0, sizeof(* info)); head->bfType[0] = 'B'; head->bfType[1] = 'M'; head->bfOffBits = 14 + sizeof(* info); head->bfSize = head->bfOffBits + size; head->bfSize = (head->bfSize + 3) & ~3; size = head->bfSize - head->bfOffBits; info->biSize = sizeof(BMPINFO); info->biWidth = w; info->biHeight = -(h- minusTop-minusBottom); info->biPlanes = 1; info->biBitCount = 32; info->biCompression = BI_RGB; info->biSizeImage = size; printf("rgb888:%dbit,%d*%d,%d\n", info->biBitCount, w, h, head->bfSize); } return size; } static int get_rgb565_header(int w, int h, BMPHEADER * head, BITMAPINFO * info,int minusTop, int minusBottom) { int size = 0; if (head && info) { size = w * (h- minusTop-minusBottom) * 2; memset(head, 0, sizeof(* head)); memset(info, 0, sizeof(* info)); head->bfType[0] = 'B'; head->bfType[1] = 'M'; head->bfOffBits = 14 + sizeof(* info); head->bfSize = head->bfOffBits + size; head->bfSize = (head->bfSize + 3) & ~3; size = head->bfSize - head->bfOffBits; info->bmiHeader.biSize = sizeof(info->bmiHeader); info->bmiHeader.biWidth = w; info->bmiHeader.biHeight = -(h- minusTop-minusBottom); info->bmiHeader.biPlanes = 1; info->bmiHeader.biBitCount = 16; info->bmiHeader.biCompression = BI_BITFIELDS; info->bmiHeader.biSizeImage = size; info->rgb[0] = 0xF800; info->rgb[1] = 0x07E0; info->rgb[2] = 0x001F; printf("rgb565:%dbit,%d*%d,%d\n", info->bmiHeader.biBitCount, w, h, head->bfSize); } return size; } static int save_bmp_rgb565(FILE * hfile, int w, int h, void * pdata, int dataSize,int minusTop, int minusBottom) { int success = 0; int size = 0; BMPHEADER head; BITMAPINFO info; size = get_rgb565_header(w, h, &head, &info,minusTop, minusBottom); if (size > 0) { if(fwrite(head.bfType, 1, 14, hfile)!=14) return SCREENSHOT_IMAGE_WRITE_ERROR; if(fwrite(&info, 1, sizeof(info), hfile)!=sizeof(info)) return SCREENSHOT_IMAGE_WRITE_ERROR; if(minusTop>0) pdata +=minusTop*2*w; if(fwrite(pdata, 1, size, hfile)!=size) return SCREENSHOT_IMAGE_WRITE_ERROR; } else success=SCREENSHOT_IMAGE_DATA_ERROR; return success; } static int save_bmp_rgb888(FILE * hfile, int w, int h, void * pdata, int dataSize,int minusTop, int minusBottom) { int success = 0; int size = 0; BMPHEADER head; BMPINFO info; size = get_rgb888_header(w, h, &head, &info,minusTop, minusBottom); if (size > 0) { if(fwrite(head.bfType, 1, 14, hfile)!=14) return SCREENSHOT_IMAGE_WRITE_ERROR; if(fwrite(&info, 1, sizeof(info), hfile)!=sizeof(info)) return SCREENSHOT_IMAGE_WRITE_ERROR; if(minusTop>0) pdata +=minusTop*3*w; if(fwrite(pdata, 1, size, hfile)!=size) return SCREENSHOT_IMAGE_WRITE_ERROR; } else success=SCREENSHOT_IMAGE_DATA_ERROR; return success; } static int save_bmp_rgb8888(FILE * hfile, int w, int h, void * pdata, int dataSize,int minusTop, int minusBottom) { int success = 0; int size = 0; BMPHEADER head; BMPINFO info; size = get_rgb8888_header(w, h, &head, &info,minusTop, minusBottom); printf("rgb8888 size:%d\n", size); if (size > 0) { if(fwrite(head.bfType, 1, 14, hfile)!=14) return SCREENSHOT_IMAGE_WRITE_ERROR; if(fwrite(&info, 1, sizeof(info), hfile)!=sizeof(info)) return SCREENSHOT_IMAGE_WRITE_ERROR; if(minusTop>0) pdata +=minusTop*4*w; if(fwrite(pdata, 1, size, hfile)!=size) return SCREENSHOT_IMAGE_WRITE_ERROR; } else success=SCREENSHOT_IMAGE_DATA_ERROR; return success; } int save_bmp(const char * path, int w, int h, void * pdata, int bpp, int dataSize,int minusTop, int minusBottom) { int success = 0; FILE * hfile = NULL; android_trace(path,2); android_trace("width:",w); android_trace("height",h); android_trace("bpp:",bpp); do { if (path == NULL || w <= 0 || h <= 0 || pdata == NULL) { printf("if (path == NULL || w <= 0 || h <= 0 || pdata == NULL)\n"); break; } remove(path); hfile = fopen(path, "wb"); if (hfile == NULL) { printf("open(%s) fail