| /* |
| * wrbmp.c |
| * |
| * This file was part of the Independent JPEG Group's software: |
| * Copyright (C) 1994-1996, Thomas G. Lane. |
| * libjpeg-turbo Modifications: |
| * Copyright (C) 2013, Linaro Limited. |
| * Copyright (C) 2014, D. R. Commander. |
| * For conditions of distribution and use, see the accompanying README.ijg |
| * file. |
| * |
| * This file contains routines to write output images in Microsoft "BMP" |
| * format (MS Windows 3.x and OS/2 1.x flavors). |
| * Either 8-bit colormapped or 24-bit full-color format can be written. |
| * No compression is supported. |
| * |
| * These routines may need modification for non-Unix environments or |
| * specialized applications. As they stand, they assume output to |
| * an ordinary stdio stream. |
| * |
| * This code contributed by James Arthur Boucher. |
| */ |
| |
| #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
| #include "jconfigint.h" |
| |
| #ifdef BMP_SUPPORTED |
| |
| |
| /* |
| * To support 12-bit JPEG data, we'd have to scale output down to 8 bits. |
| * This is not yet implemented. |
| */ |
| |
| #if BITS_IN_JSAMPLE != 8 |
| Sorry, this code only copes with 8-bit JSAMPLEs. /* deliberate syntax err */ |
| #endif |
| |
| /* |
| * Since BMP stores scanlines bottom-to-top, we have to invert the image |
| * from JPEG's top-to-bottom order. To do this, we save the outgoing data |
| * in a virtual array during put_pixel_row calls, then actually emit the |
| * BMP file during finish_output. The virtual array contains one JSAMPLE per |
| * pixel if the output is grayscale or colormapped, three if it is full color. |
| */ |
| |
| /* Private version of data destination object */ |
| |
| typedef struct { |
| struct djpeg_dest_struct pub; /* public fields */ |
| |
| boolean is_os2; /* saves the OS2 format request flag */ |
| |
| jvirt_sarray_ptr whole_image; /* needed to reverse row order */ |
| JDIMENSION data_width; /* JSAMPLEs per row */ |
| JDIMENSION row_width; /* physical width of one row in the BMP file */ |
| int pad_bytes; /* number of padding bytes needed per row */ |
| JDIMENSION cur_output_row; /* next row# to write to virtual array */ |
| } bmp_dest_struct; |
| |
| typedef bmp_dest_struct * bmp_dest_ptr; |
| |
| |
| /* Forward declarations */ |
| LOCAL(void) write_colormap |
| (j_decompress_ptr cinfo, bmp_dest_ptr dest, int map_colors, |
| int map_entry_size); |
| |
| |
| static INLINE boolean is_big_endian(void) |
| { |
| int test_value = 1; |
| if(*(char *)&test_value != 1) |
| return TRUE; |
| return FALSE; |
| } |
| |
| |
| /* |
| * Write some pixel data. |
| * In this module rows_supplied will always be 1. |
| */ |
| |
| METHODDEF(void) |
| put_pixel_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, |
| JDIMENSION rows_supplied) |
| /* This version is for writing 24-bit pixels */ |
| { |
| bmp_dest_ptr dest = (bmp_dest_ptr) dinfo; |
| JSAMPARRAY image_ptr; |
| register JSAMPROW inptr, outptr; |
| register JDIMENSION col; |
| int pad; |
| |
| /* Access next row in virtual array */ |
| image_ptr = (*cinfo->mem->access_virt_sarray) |
| ((j_common_ptr) cinfo, dest->whole_image, |
| dest->cur_output_row, (JDIMENSION) 1, TRUE); |
| dest->cur_output_row++; |
| |
| /* Transfer data. Note destination values must be in BGR order |
| * (even though Microsoft's own documents say the opposite). |
| */ |
| inptr = dest->pub.buffer[0]; |
| outptr = image_ptr[0]; |
| |
| if(cinfo->out_color_space == JCS_RGB565) { |
| boolean big_endian = is_big_endian(); |
| unsigned short *inptr2 = (unsigned short *)inptr; |
| for (col = cinfo->output_width; col > 0; col--) { |
| if (big_endian) { |
| outptr[0] = (*inptr2 >> 5) & 0xF8; |
| outptr[1] = ((*inptr2 << 5) & 0xE0) | ((*inptr2 >> 11) & 0x1C); |
| outptr[2] = *inptr2 & 0xF8; |
| } else { |
| outptr[0] = (*inptr2 << 3) & 0xF8; |
| outptr[1] = (*inptr2 >> 3) & 0xFC; |
| outptr[2] = (*inptr2 >> 8) & 0xF8; |
| } |
| outptr += 3; |
| inptr2++; |
| } |
| } else { |
| for (col = cinfo->output_width; col > 0; col--) { |
| outptr[2] = *inptr++; /* can omit GETJSAMPLE() safely */ |
| outptr[1] = *inptr++; |
| outptr[0] = *inptr++; |
| outptr += 3; |
| } |
| } |
| |
| /* Zero out the pad bytes. */ |
| pad = dest->pad_bytes; |
| while (--pad >= 0) |
| *outptr++ = 0; |
| } |
| |
| METHODDEF(void) |
| put_gray_rows (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo, |
| JDIMENSION rows_supplied) |
| /* This version is for grayscale OR quantized color output */ |
| { |
| bmp_dest_ptr dest = (bmp_dest_ptr) dinfo; |
| JSAMPARRAY image_ptr; |
| register JSAMPROW inptr, outptr; |
| register JDIMENSION col; |
| int pad; |
| |
| /* Access next row in virtual array */ |
| image_ptr = (*cinfo->mem->access_virt_sarray) |
| ((j_common_ptr) cinfo, dest->whole_image, |
| dest->cur_output_row, (JDIMENSION) 1, TRUE); |
| dest->cur_output_row++; |
| |
| /* Transfer data. */ |
| inptr = dest->pub.buffer[0]; |
| outptr = image_ptr[0]; |
| for (col = cinfo->output_width; col > 0; col--) { |
| *outptr++ = *inptr++; /* can omit GETJSAMPLE() safely */ |
| } |
| |
| /* Zero out the pad bytes. */ |
| pad = dest->pad_bytes; |
| while (--pad >= 0) |
| *outptr++ = 0; |
| } |
| |
| |
| /* |
| * Startup: normally writes the file header. |
| * In this module we may as well postpone everything until finish_output. |
| */ |
| |
| METHODDEF(void) |
| start_output_bmp (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo) |
| { |
| /* no work here */ |
| } |
| |
| |
| /* |
| * Finish up at the end of the file. |
| * |
| * Here is where we really output the BMP file. |
| * |
| * First, routines to write the Windows and OS/2 variants of the file header. |
| */ |
| |
| LOCAL(void) |
| write_bmp_header (j_decompress_ptr cinfo, bmp_dest_ptr dest) |
| /* Write a Windows-style BMP file header, including colormap if needed */ |
| { |
| char bmpfileheader[14]; |
| char bmpinfoheader[40]; |
| #define PUT_2B(array,offset,value) \ |
| (array[offset] = (char) ((value) & 0xFF), \ |
| array[offset+1] = (char) (((value) >> 8) & 0xFF)) |
| #define PUT_4B(array,offset,value) \ |
| (array[offset] = (char) ((value) & 0xFF), \ |
| array[offset+1] = (char) (((value) >> 8) & 0xFF), \ |
| array[offset+2] = (char) (((value) >> 16) & 0xFF), \ |
| array[offset+3] = (char) (((value) >> 24) & 0xFF)) |
| INT32 headersize, bfSize; |
| int bits_per_pixel, cmap_entries; |
| |
| /* Compute colormap size and total file size */ |
| if (cinfo->out_color_space == JCS_RGB) { |
| if (cinfo->quantize_colors) { |
| /* Colormapped RGB */ |
| bits_per_pixel = 8; |
| cmap_entries = 256; |
| } else { |
| /* Unquantized, full color RGB */ |
| bits_per_pixel = 24; |
| cmap_entries = 0; |
| } |
| } else if (cinfo->out_color_space == JCS_RGB565) { |
| bits_per_pixel = 24; |
| cmap_entries = 0; |
| } else { |
| /* Grayscale output. We need to fake a 256-entry colormap. */ |
| bits_per_pixel = 8; |
| cmap_entries = 256; |
| } |
| /* File size */ |
| headersize = 14 + 40 + cmap_entries * 4; /* Header and colormap */ |
| bfSize = headersize + (INT32) dest->row_width * (INT32) cinfo->output_height; |
| |
| /* Set unused fields of header to 0 */ |
| MEMZERO(bmpfileheader, sizeof(bmpfileheader)); |
| MEMZERO(bmpinfoheader, sizeof(bmpinfoheader)); |
| |
| /* Fill the file header */ |
| bmpfileheader[0] = 0x42; /* first 2 bytes are ASCII 'B', 'M' */ |
| bmpfileheader[1] = 0x4D; |
| PUT_4B(bmpfileheader, 2, bfSize); /* bfSize */ |
| /* we leave bfReserved1 & bfReserved2 = 0 */ |
| PUT_4B(bmpfileheader, 10, headersize); /* bfOffBits */ |
| |
| /* Fill the info header (Microsoft calls this a BITMAPINFOHEADER) */ |
| PUT_2B(bmpinfoheader, 0, 40); /* biSize */ |
| PUT_4B(bmpinfoheader, 4, cinfo->output_width); /* biWidth */ |
| PUT_4B(bmpinfoheader, 8, cinfo->output_height); /* biHeight */ |
| PUT_2B(bmpinfoheader, 12, 1); /* biPlanes - must be 1 */ |
| PUT_2B(bmpinfoheader, 14, bits_per_pixel); /* biBitCount */ |
| /* we leave biCompression = 0, for none */ |
| /* we leave biSizeImage = 0; this is correct for uncompressed data */ |
| if (cinfo->density_unit == 2) { /* if have density in dots/cm, then */ |
| PUT_4B(bmpinfoheader, 24, (INT32) (cinfo->X_density*100)); /* XPels/M */ |
| PUT_4B(bmpinfoheader, 28, (INT32) (cinfo->Y_density*100)); /* XPels/M */ |
| } |
| PUT_2B(bmpinfoheader, 32, cmap_entries); /* biClrUsed */ |
| /* we leave biClrImportant = 0 */ |
| |
| if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14) |
| ERREXIT(cinfo, JERR_FILE_WRITE); |
| if (JFWRITE(dest->pub.output_file, bmpinfoheader, 40) != (size_t) 40) |
| ERREXIT(cinfo, JERR_FILE_WRITE); |
| |
| if (cmap_entries > 0) |
| write_colormap(cinfo, dest, cmap_entries, 4); |
| } |
| |
| |
| LOCAL(void) |
| write_os2_header (j_decompress_ptr cinfo, bmp_dest_ptr dest) |
| /* Write an OS2-style BMP file header, including colormap if needed */ |
| { |
| char bmpfileheader[14]; |
| char bmpcoreheader[12]; |
| INT32 headersize, bfSize; |
| int bits_per_pixel, cmap_entries; |
| |
| /* Compute colormap size and total file size */ |
| if (cinfo->out_color_space == JCS_RGB) { |
| if (cinfo->quantize_colors) { |
| /* Colormapped RGB */ |
| bits_per_pixel = 8; |
| cmap_entries = 256; |
| } else { |
| /* Unquantized, full color RGB */ |
| bits_per_pixel = 24; |
| cmap_entries = 0; |
| } |
| } else if (cinfo->out_color_space == JCS_RGB565) { |
| bits_per_pixel = 24; |
| cmap_entries = 0; |
| } else { |
| /* Grayscale output. We need to fake a 256-entry colormap. */ |
| bits_per_pixel = 8; |
| cmap_entries = 256; |
| } |
| /* File size */ |
| headersize = 14 + 12 + cmap_entries * 3; /* Header and colormap */ |
| bfSize = headersize + (INT32) dest->row_width * (INT32) cinfo->output_height; |
| |
| /* Set unused fields of header to 0 */ |
| MEMZERO(bmpfileheader, sizeof(bmpfileheader)); |
| MEMZERO(bmpcoreheader, sizeof(bmpcoreheader)); |
| |
| /* Fill the file header */ |
| bmpfileheader[0] = 0x42; /* first 2 bytes are ASCII 'B', 'M' */ |
| bmpfileheader[1] = 0x4D; |
| PUT_4B(bmpfileheader, 2, bfSize); /* bfSize */ |
| /* we leave bfReserved1 & bfReserved2 = 0 */ |
| PUT_4B(bmpfileheader, 10, headersize); /* bfOffBits */ |
| |
| /* Fill the info header (Microsoft calls this a BITMAPCOREHEADER) */ |
| PUT_2B(bmpcoreheader, 0, 12); /* bcSize */ |
| PUT_2B(bmpcoreheader, 4, cinfo->output_width); /* bcWidth */ |
| PUT_2B(bmpcoreheader, 6, cinfo->output_height); /* bcHeight */ |
| PUT_2B(bmpcoreheader, 8, 1); /* bcPlanes - must be 1 */ |
| PUT_2B(bmpcoreheader, 10, bits_per_pixel); /* bcBitCount */ |
| |
| if (JFWRITE(dest->pub.output_file, bmpfileheader, 14) != (size_t) 14) |
| ERREXIT(cinfo, JERR_FILE_WRITE); |
| if (JFWRITE(dest->pub.output_file, bmpcoreheader, 12) != (size_t) 12) |
| ERREXIT(cinfo, JERR_FILE_WRITE); |
| |
| if (cmap_entries > 0) |
| write_colormap(cinfo, dest, cmap_entries, 3); |
| } |
| |
| |
| /* |
| * Write the colormap. |
| * Windows uses BGR0 map entries; OS/2 uses BGR entries. |
| */ |
| |
| LOCAL(void) |
| write_colormap (j_decompress_ptr cinfo, bmp_dest_ptr dest, |
| int map_colors, int map_entry_size) |
| { |
| JSAMPARRAY colormap = cinfo->colormap; |
| int num_colors = cinfo->actual_number_of_colors; |
| FILE * outfile = dest->pub.output_file; |
| int i; |
| |
| if (colormap != NULL) { |
| if (cinfo->out_color_components == 3) { |
| /* Normal case with RGB colormap */ |
| for (i = 0; i < num_colors; i++) { |
| putc(GETJSAMPLE(colormap[2][i]), outfile); |
| putc(GETJSAMPLE(colormap[1][i]), outfile); |
| putc(GETJSAMPLE(colormap[0][i]), outfile); |
| if (map_entry_size == 4) |
| putc(0, outfile); |
| } |
| } else { |
| /* Grayscale colormap (only happens with grayscale quantization) */ |
| for (i = 0; i < num_colors; i++) { |
| putc(GETJSAMPLE(colormap[0][i]), outfile); |
| putc(GETJSAMPLE(colormap[0][i]), outfile); |
| putc(GETJSAMPLE(colormap[0][i]), outfile); |
| if (map_entry_size == 4) |
| putc(0, outfile); |
| } |
| } |
| } else { |
| /* If no colormap, must be grayscale data. Generate a linear "map". */ |
| for (i = 0; i < 256; i++) { |
| putc(i, outfile); |
| putc(i, outfile); |
| putc(i, outfile); |
| if (map_entry_size == 4) |
| putc(0, outfile); |
| } |
| } |
| /* Pad colormap with zeros to ensure specified number of colormap entries */ |
| if (i > map_colors) |
| ERREXIT1(cinfo, JERR_TOO_MANY_COLORS, i); |
| for (; i < map_colors; i++) { |
| putc(0, outfile); |
| putc(0, outfile); |
| putc(0, outfile); |
| if (map_entry_size == 4) |
| putc(0, outfile); |
| } |
| } |
| |
| |
| METHODDEF(void) |
| finish_output_bmp (j_decompress_ptr cinfo, djpeg_dest_ptr dinfo) |
| { |
| bmp_dest_ptr dest = (bmp_dest_ptr) dinfo; |
| register FILE * outfile = dest->pub.output_file; |
| JSAMPARRAY image_ptr; |
| register JSAMPROW data_ptr; |
| JDIMENSION row; |
| register JDIMENSION col; |
| cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
| |
| /* Write the header and colormap */ |
| if (dest->is_os2) |
| write_os2_header(cinfo, dest); |
| else |
| write_bmp_header(cinfo, dest); |
| |
| /* Write the file body from our virtual array */ |
| for (row = cinfo->output_height; row > 0; row--) { |
| if (progress != NULL) { |
| progress->pub.pass_counter = (long) (cinfo->output_height - row); |
| progress->pub.pass_limit = (long) cinfo->output_height; |
| (*progress->pub.progress_monitor) ((j_common_ptr) cinfo); |
| } |
| image_ptr = (*cinfo->mem->access_virt_sarray) |
| ((j_common_ptr) cinfo, dest->whole_image, row-1, (JDIMENSION) 1, FALSE); |
| data_ptr = image_ptr[0]; |
| for (col = dest->row_width; col > 0; col--) { |
| putc(GETJSAMPLE(*data_ptr), outfile); |
| data_ptr++; |
| } |
| } |
| if (progress != NULL) |
| progress->completed_extra_passes++; |
| |
| /* Make sure we wrote the output file OK */ |
| fflush(outfile); |
| if (ferror(outfile)) |
| ERREXIT(cinfo, JERR_FILE_WRITE); |
| } |
| |
| |
| /* |
| * The module selection routine for BMP format output. |
| */ |
| |
| GLOBAL(djpeg_dest_ptr) |
| jinit_write_bmp (j_decompress_ptr cinfo, boolean is_os2) |
| { |
| bmp_dest_ptr dest; |
| JDIMENSION row_width; |
| |
| /* Create module interface object, fill in method pointers */ |
| dest = (bmp_dest_ptr) |
| (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
| sizeof(bmp_dest_struct)); |
| dest->pub.start_output = start_output_bmp; |
| dest->pub.finish_output = finish_output_bmp; |
| dest->is_os2 = is_os2; |
| |
| if (cinfo->out_color_space == JCS_GRAYSCALE) { |
| dest->pub.put_pixel_rows = put_gray_rows; |
| } else if (cinfo->out_color_space == JCS_RGB) { |
| if (cinfo->quantize_colors) |
| dest->pub.put_pixel_rows = put_gray_rows; |
| else |
| dest->pub.put_pixel_rows = put_pixel_rows; |
| } else if(cinfo->out_color_space == JCS_RGB565 ) { |
| dest->pub.put_pixel_rows = put_pixel_rows; |
| } else { |
| ERREXIT(cinfo, JERR_BMP_COLORSPACE); |
| } |
| |
| /* Calculate output image dimensions so we can allocate space */ |
| jpeg_calc_output_dimensions(cinfo); |
| |
| /* Determine width of rows in the BMP file (padded to 4-byte boundary). */ |
| if (cinfo->out_color_space == JCS_RGB565) { |
| row_width = cinfo->output_width * 2; |
| dest->row_width = dest->data_width = cinfo->output_width * 3; |
| } else { |
| row_width = cinfo->output_width * cinfo->output_components; |
| dest->row_width = dest->data_width = row_width; |
| } |
| while ((dest->row_width & 3) != 0) dest->row_width++; |
| dest->pad_bytes = (int) (dest->row_width - dest->data_width); |
| if (cinfo->out_color_space == JCS_RGB565) { |
| while ((row_width & 3) != 0) row_width++; |
| } else { |
| row_width = dest->row_width; |
| } |
| |
| |
| /* Allocate space for inversion array, prepare for write pass */ |
| dest->whole_image = (*cinfo->mem->request_virt_sarray) |
| ((j_common_ptr) cinfo, JPOOL_IMAGE, FALSE, |
| dest->row_width, cinfo->output_height, (JDIMENSION) 1); |
| dest->cur_output_row = 0; |
| if (cinfo->progress != NULL) { |
| cd_progress_ptr progress = (cd_progress_ptr) cinfo->progress; |
| progress->total_extra_passes++; /* count file input as separate pass */ |
| } |
| |
| /* Create decompressor output buffer. */ |
| dest->pub.buffer = (*cinfo->mem->alloc_sarray) |
| ((j_common_ptr) cinfo, JPOOL_IMAGE, row_width, (JDIMENSION) 1); |
| dest->pub.buffer_height = 1; |
| |
| return (djpeg_dest_ptr) dest; |
| } |
| |
| #endif /* BMP_SUPPORTED */ |