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rockbox/tools/bmp2rb.c
Daniel Stenberg 2d81cf9956 Magnus Holmgren's patch #708098 that makes bmp2rb insensitive to endianess 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@3691 a1c6a512-1295-4272-9138-f99709370657
2003-05-21 06:31:44 +00:00

430 lines
11 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 by Linus Nielsen Feltzing
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
/*********************************************************************
*
* Converts BMP files to Rockbox bitmap format
*
* 1999-05-03 Linus Nielsen Feltzing
*
**********************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define debugf printf
#ifdef __GNUC__
#define STRUCT_PACKED __attribute__((packed))
#else
#define STRUCT_PACKED
#pragma pack (push, 2)
#endif
struct Fileheader
{
unsigned short Type; /* signature - 'BM' */
unsigned long Size; /* file size in bytes */
unsigned short Reserved1; /* 0 */
unsigned short Reserved2; /* 0 */
unsigned long OffBits; /* offset to bitmap */
unsigned long StructSize; /* size of this struct (40) */
unsigned long Width; /* bmap width in pixels */
unsigned long Height; /* bmap height in pixels */
unsigned short Planes; /* num planes - always 1 */
unsigned short BitCount; /* bits per pixel */
unsigned long Compression; /* compression flag */
unsigned long SizeImage; /* image size in bytes */
long XPelsPerMeter; /* horz resolution */
long YPelsPerMeter; /* vert resolution */
unsigned long ClrUsed; /* 0 -> color table size */
unsigned long ClrImportant; /* important color count */
} STRUCT_PACKED;
struct RGBQUAD
{
unsigned char rgbBlue;
unsigned char rgbGreen;
unsigned char rgbRed;
unsigned char rgbReserved;
} STRUCT_PACKED;
short readshort(void* value)
{
unsigned char* bytes = (unsigned char*) value;
return bytes[0] | (bytes[1] << 8);
}
int readlong(void* value)
{
unsigned char* bytes = (unsigned char*) value;
return bytes[0] | (bytes[1] << 8) | (bytes[2] << 16) | (bytes[3] << 24);
}
/*********************************************************************
* read_bmp_file()
*
* Reads a 8bit BMP file and puts the data in a 1-pixel-per-byte
* array. Returns 0 on success.
*
*********************************************************************/
int read_bmp_file(char* filename,
int *get_width, /* in pixels */
int *get_height, /* in pixels */
char **bitmap)
{
struct Fileheader fh;
struct RGBQUAD palette[2]; /* two colors only */
unsigned int bitmap_width, bitmap_height;
long PaddedWidth;
int background;
int fd = open(filename, O_RDONLY);
long size;
unsigned int row, col;
int l;
unsigned char *bmp;
int width;
int depth;
if(fd == -1)
{
debugf("error - can't open '%s'\n", filename);
return 1;
}
else
{
if(read(fd, &fh, sizeof(struct Fileheader)) !=
sizeof(struct Fileheader))
{
debugf("error - can't Read Fileheader Stucture\n");
close(fd);
return 2;
}
/* Exit if more than 8 bits */
depth = readshort(&fh.BitCount);
if(depth > 8)
{
debugf("error - Bitmap uses more than 8 bit depth, got %d\n",
depth);
close(fd);
return 2;
}
/* Exit if too wide */
if(readlong(&fh.Width) > 112)
{
debugf("error - Bitmap is too wide (%d pixels, max is 112)\n",
readlong(&fh.Width));
close(fd);
return 3;
}
/* Exit if too high */
if(readlong(&fh.Height) > 64)
{
debugf("error - Bitmap is too high (%d pixels, max is 64)\n",
readlong(&fh.Height));
close(fd);
return 4;
}
for(l=0;l < 2;l++)
{
if(read(fd, &palette[l],sizeof(struct RGBQUAD)) !=
sizeof(struct RGBQUAD))
{
debugf("error - Can't read bitmap's color palette\n");
close(fd);
return 5;
}
}
if(depth == 8 ) {
/* pass the other palettes */
lseek(fd, 254*sizeof(struct RGBQUAD), SEEK_CUR);
}
/* Try to guess the foreground and background colors.
We assume that the foreground color is the darkest. */
if(((int)palette[0].rgbRed +
(int)palette[0].rgbGreen +
(int)palette[0].rgbBlue) >
((int)palette[1].rgbRed +
(int)palette[1].rgbGreen +
(int)palette[1].rgbBlue))
{
background = 0;
}
else
{
background = 1;
}
width = readlong(&fh.Width);
if(depth == 8)
PaddedWidth = ((width+3)&(~0x3)); /* aligned 4-bytes boundaries */
else
PaddedWidth = ((width+31)&(~0x1f))/8;
size = PaddedWidth*readlong(&fh.Height);
bmp = (unsigned char *)malloc(size);
*bitmap = (unsigned char *)malloc(size);
if(bmp == NULL)
{
debugf("error - Out of memory\n");
close(fd);
return 6;
}
else
{
if(read(fd, (unsigned char*)bmp,(long)size) != size) {
debugf("error - Can't read image\n");
close(fd);
return 7;
}
}
bitmap_height = readlong(&fh.Height);
bitmap_width = readlong(&fh.Width);
*get_width = bitmap_width;
*get_height = bitmap_height;
if(depth == 8)
{
/* Now convert the bitmap into an array with 1 byte per pixel,
exactly the size of the image */
for(row = 0;row < bitmap_height;row++) {
for(col = 0;col < bitmap_width;col++) {
if(bmp[(bitmap_height-1 -row) * PaddedWidth + col]) {
(*bitmap)[ (row/8) * bitmap_width + col ] &=
~ (1<<(row&7));
}
else {
(*bitmap)[ (row/8) * bitmap_width + col ] |=
1<<(row&7);
}
}
}
}
else
{
int bit;
int byte;
/* monocrome BMP conversion uses 8 pixels per byte */
for(row = 0; row < bitmap_height; row++) {
bit = 7;
byte = 0;
for(col = 0;col < bitmap_width;col++) {
if((bmp[(bitmap_height - row - 1) * PaddedWidth + byte] &
(1 << bit))) {
(*bitmap)[(row/8) * bitmap_width + col ] &=
~(1<<(row&7));
}
else {
(*bitmap)[(row/8) * bitmap_width + col ] |=
1<<(row&7);
}
if(bit) {
bit--;
}
else {
bit = 7;
byte++;
}
}
}
}
free(bmp);
}
close(fd);
return 0; /* success */
}
/*********************************************************************
** generate_c_source()
**
** Outputs a C source code with the bitmap in an array, accompanied by
** some #define's
**********************************************************************/
void generate_c_source(char *id, int width, int height, unsigned char *bitmap)
{
FILE *f;
unsigned int i, a, eline;
f = stdout;
if(!id || !id[0])
id = "bitmap";
fprintf(f,
"#define BMPHEIGHT_%s %d"
"\n#define BMPWIDTH_%s %d"
"\nconst unsigned char %s[] = {\n",
id, height, id, width, id );
for(i=0, eline=0; i< height; i+=8, eline++) {
for (a=0; a<width; a++)
fprintf(f, "0x%02x,%c", bitmap[eline*width + a],
(a+1)%13?' ':'\n');
fprintf(f, "\n");
}
fprintf(f, "\n};\n");
}
/*********************************************************************
** generate_ascii()
**
** Outputs an ascii picture of the bitmap
**********************************************************************/
void generate_ascii(int width, int height, unsigned char *bitmap)
{
FILE *f;
unsigned int i, eline;
f = stdout;
/* for screen output debugging */
for(i=0, eline=0; i< height; i+=8, eline++) {
unsigned int x, y;
for(y=0; y<8 && (i+y < height); y++) {
for(x=0; x < width; x++) {
if(bitmap[eline*width + x] & (1<<y)) {
fprintf(f, "*");
}
else
fprintf(f, " ");
}
fprintf(f, "\n");
}
}
}
void print_usage(void)
{
printf("Usage: %s [-i <id>] [-a] <bitmap file>\n"
"\t-i <id> Bitmap name (default is filename without extension)\n"
"\t-a Show ascii picture of bitmap\n",
APPLICATION_NAME);
printf("build date: " __DATE__ "\n\n");
}
int main(int argc, char **argv)
{
char *bmp_filename = NULL;
char *id = NULL;
int i;
int height, width;
int ascii = false;
char* bitmap = NULL;
for(i = 1;i < argc;i++)
{
if(argv[i][0] == '-')
{
switch(argv[i][1])
{
case 'i': /* ID */
if(argv[i][2])
{
id = &argv[i][2];
}
else if(argc > i+1)
{
id = argv[i+1];
i++;
}
else
{
print_usage();
exit(1);
}
break;
case 'a': /* Assembly */
ascii = true;
break;
default:
print_usage();
exit(1);
break;
}
}
else
{
if(!bmp_filename)
{
bmp_filename = argv[i];
}
else
{
print_usage();
exit(1);
}
}
}
if (!bmp_filename)
{
print_usage();
exit(1);
}
if (!id)
{
char *ptr=strrchr(bmp_filename, '/');
if(ptr)
ptr++;
else
ptr = bmp_filename;
id = strdup(ptr);
for (i = 0; id[i]; i++)
if (id[i] == '.')
id[i] = '\0';
}
if (read_bmp_file(bmp_filename, &width, &height, &bitmap))
return 0;
if (ascii)
generate_ascii(width, height, bitmap);
else
generate_c_source(id, width, height, bitmap);
return 0;
}
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