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/*
* Copyright 2011 Luc Verhaegen <libv@codethink.co.uk>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sub license,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
*/
/*
* Quick 'n Dirty bitmap dumper.
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include "write_bmp.h"
#define FILENAME_SIZE 1024
struct bmp_header {
unsigned short magic;
unsigned int size;
unsigned int unused;
unsigned int start;
} __attribute__((__packed__));
struct dib_header {
unsigned int size;
unsigned int width;
unsigned int height;
unsigned short planes;
unsigned short bpp;
unsigned int compression;
unsigned int data_size;
unsigned int h_res;
unsigned int v_res;
unsigned int colours;
unsigned int important_colours;
unsigned int red_mask;
unsigned int green_mask;
unsigned int blue_mask;
unsigned int alpha_mask;
unsigned int colour_space;
unsigned int unused[12];
} __attribute__((__packed__));
static void
bmp_header_write(int fd, int width, int height, int bgra, int noflip, int alpha)
{
struct bmp_header bmp_header = {
.magic = 0x4d42,
.size = (width * height * 4) +
sizeof(struct bmp_header) + sizeof(struct dib_header),
.start = sizeof(struct bmp_header) + sizeof(struct dib_header),
};
struct dib_header dib_header = {
.size = sizeof(struct dib_header),
.width = width,
.height = noflip ? -height : height,
.planes = 1,
.bpp = 32,
.compression = 3,
.data_size = 4 * width * height,
.h_res = 0xB13,
.v_res = 0xB13,
.colours = 0,
.important_colours = 0,
.red_mask = 0x000000FF,
.green_mask = 0x0000FF00,
.blue_mask = 0x00FF0000,
.alpha_mask = alpha ? 0xFF000000 : 0x00000000,
.colour_space = 0x57696E20,
};
if (bgra) {
dib_header.red_mask = 0x00FF0000;
dib_header.blue_mask = 0x000000FF;
}
write(fd, &bmp_header, sizeof(struct bmp_header));
write(fd, &dib_header, sizeof(struct dib_header));
}
void
bmp_dump32(char *buffer, unsigned width, unsigned height, bool bgra, const char *filename)
{
int fd;
fd = open(filename, O_WRONLY| O_TRUNC | O_CREAT, 0666);
if (fd == -1) {
printf("Failed to open %s: %s\n", filename, strerror(errno));
return;
}
bmp_header_write(fd, width, height, bgra, false, true);
write(fd, buffer, width * height * 4);
}
void
bmp_dump32_noflip(char *buffer, unsigned width, unsigned height, bool bgra, const char *filename)
{
int fd;
fd = open(filename, O_WRONLY| O_TRUNC | O_CREAT, 0666);
if (fd == -1) {
printf("Failed to open %s: %s\n", filename, strerror(errno));
return;
}
bmp_header_write(fd, width, height, bgra, true, true);
write(fd, buffer, width * height * 4);
}
void
bmp_dump32_ex(char *buffer, unsigned width, unsigned height, bool flip, bool bgra, bool alpha, const char *filename)
{
int fd;
fd = open(filename, O_WRONLY| O_TRUNC | O_CREAT, 0666);
if (fd == -1) {
printf("Failed to open %s: %s\n", filename, strerror(errno));
return;
}
bmp_header_write(fd, width, height, bgra, flip, alpha);
write(fd, buffer, width * height * 4);
}
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