7e3acc0e0a
The IJG README file has been renamed to README.ijg, in order to avoid confusion (many people were assuming that that was our project's README file and weren't reading README-turbo.txt) and to lay the groundwork for markdown versions of the libjpeg-turbo README and build instructions.
494 lines
15 KiB
C
494 lines
15 KiB
C
/*
|
|
* 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 */
|