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bitmap.c
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bitmap.c
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/*
* Copyright (c) 1997-2006 Motoyuki Kasahara
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "build-pre.h"
#include "eb.h"
#include "error.h"
#include "font.h"
#include "build-post.h"
#include <zlib.h>
/*
* Unexported functions.
*/
static unsigned long png_crc(const char *buf, size_t len);
static int png_compress(const char *src, int width, int height, char *dest,
size_t *dest_len);
/*
* Return required buffer size for a narrow font character converted
* to XBM image format.
*/
EB_Error_Code
eb_narrow_font_xbm_size(EB_Font_Code height, size_t *size)
{
EB_Error_Code error_code;
LOG(("in: eb_narrow_font_xbm_size(height=%d)", (int)height));
switch (height) {
case EB_FONT_16:
*size = EB_SIZE_NARROW_FONT_16_XBM;
break;
case EB_FONT_24:
*size = EB_SIZE_NARROW_FONT_24_XBM;
break;
case EB_FONT_30:
*size = EB_SIZE_NARROW_FONT_30_XBM;
break;
case EB_FONT_48:
*size = EB_SIZE_NARROW_FONT_48_XBM;
break;
default:
error_code = EB_ERR_NO_SUCH_FONT;
goto failed;
}
LOG(("out: eb_narrow_font_xbm_size(size=%ld) = %s", (long)*size,
eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
*size = 0;
LOG(("out: eb_narrow_font_xbm_size() = %s", eb_error_string(error_code)));
return error_code;
}
/*
* Return required buffer size for a narrow font character converted
* to XPM image format.
*/
EB_Error_Code
eb_narrow_font_xpm_size(EB_Font_Code height, size_t *size)
{
EB_Error_Code error_code;
LOG(("in: eb_narrow_font_xpm_size(height=%d)", (int)height));
switch (height) {
case EB_FONT_16:
*size = EB_SIZE_NARROW_FONT_16_XPM;
break;
case EB_FONT_24:
*size = EB_SIZE_NARROW_FONT_24_XPM;
break;
case EB_FONT_30:
*size = EB_SIZE_NARROW_FONT_30_XPM;
break;
case EB_FONT_48:
*size = EB_SIZE_NARROW_FONT_48_XPM;
break;
default:
error_code = EB_ERR_NO_SUCH_FONT;
goto failed;
}
LOG(("out: eb_narrow_font_xpm_size(size=%ld) = %s", (long)*size,
eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
*size = 0;
LOG(("out: eb_narrow_font_xpm_size() = %s", eb_error_string(error_code)));
return error_code;
}
/*
* Return required buffer size for a narrow font character converted
* to GIF image format.
*/
EB_Error_Code
eb_narrow_font_gif_size(EB_Font_Code height, size_t *size)
{
EB_Error_Code error_code;
LOG(("in: eb_narrow_font_gif_size(height=%d)", (int)height));
switch (height) {
case EB_FONT_16:
*size = EB_SIZE_NARROW_FONT_16_GIF;
break;
case EB_FONT_24:
*size = EB_SIZE_NARROW_FONT_24_GIF;
break;
case EB_FONT_30:
*size = EB_SIZE_NARROW_FONT_30_GIF;
break;
case EB_FONT_48:
*size = EB_SIZE_NARROW_FONT_48_GIF;
default:
error_code = EB_ERR_NO_SUCH_FONT;
goto failed;
}
LOG(("out: eb_narrow_font_gif_size(size=%ld) = %s", (long)*size,
eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
*size = 0;
LOG(("out: eb_narrow_font_gif_size() = %s", eb_error_string(error_code)));
return error_code;
}
/*
* Return required buffer size for a narrow font character converted
* to BMP image format.
*/
EB_Error_Code
eb_narrow_font_bmp_size(EB_Font_Code height, size_t *size)
{
EB_Error_Code error_code;
LOG(("in: eb_narrow_font_bmp_size(height=%d)", (int)height));
switch (height) {
case EB_FONT_16:
*size = EB_SIZE_NARROW_FONT_16_BMP;
break;
case EB_FONT_24:
*size = EB_SIZE_NARROW_FONT_24_BMP;
break;
case EB_FONT_30:
*size = EB_SIZE_NARROW_FONT_30_BMP;
break;
case EB_FONT_48:
*size = EB_SIZE_NARROW_FONT_48_BMP;
break;
default:
error_code = EB_ERR_NO_SUCH_FONT;
goto failed;
}
LOG(("out: eb_narrow_font_bmp_size(size=%ld) = %s", (long)*size,
eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
*size = 0;
LOG(("out: eb_narrow_font_bmp_size() = %s", eb_error_string(error_code)));
return error_code;
}
/*
* Return required buffer size for a narrow font character converted
* to PNG image format.
*/
EB_Error_Code
eb_narrow_font_png_size(EB_Font_Code height, size_t *size)
{
EB_Error_Code error_code;
LOG(("in: eb_narrow_font_png_size(height=%d)", (int)height));
switch (height) {
case EB_FONT_16:
*size = EB_SIZE_NARROW_FONT_16_PNG;
break;
case EB_FONT_24:
*size = EB_SIZE_NARROW_FONT_24_PNG;
break;
case EB_FONT_30:
*size = EB_SIZE_NARROW_FONT_30_PNG;
break;
case EB_FONT_48:
*size = EB_SIZE_NARROW_FONT_48_PNG;
default:
error_code = EB_ERR_NO_SUCH_FONT;
goto failed;
}
LOG(("out: eb_narrow_font_png_size(size=%ld) = %s", (long)*size,
eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
*size = 0;
LOG(("out: eb_narrow_font_png_size() = %s", eb_error_string(error_code)));
return error_code;
}
/*
* Return required buffer size for a wide font character converted
* to XBM image format.
*/
EB_Error_Code
eb_wide_font_xbm_size(EB_Font_Code height, size_t *size)
{
EB_Error_Code error_code;
LOG(("in: eb_wide_font_xbm_size(height=%d)", (int)height));
switch (height) {
case EB_FONT_16:
*size = EB_SIZE_WIDE_FONT_16_XBM;
break;
case EB_FONT_24:
*size = EB_SIZE_WIDE_FONT_24_XBM;
break;
case EB_FONT_30:
*size = EB_SIZE_WIDE_FONT_30_XBM;
break;
case EB_FONT_48:
*size = EB_SIZE_WIDE_FONT_48_XBM;
break;
default:
error_code = EB_ERR_NO_SUCH_FONT;
goto failed;
}
LOG(("out: eb_wide_font_xbm_size(size=%ld) = %s", (long)*size,
eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
*size = 0;
LOG(("out: eb_wide_font_xbm_size() = %s", eb_error_string(error_code)));
return error_code;
}
/*
* Return required buffer size for a wide font character converted
* to XPM image format.
*/
EB_Error_Code
eb_wide_font_xpm_size(EB_Font_Code height, size_t *size)
{
EB_Error_Code error_code;
LOG(("in: eb_wide_font_xpm_size(height=%d)", (int)height));
switch (height) {
case EB_FONT_16:
*size = EB_SIZE_WIDE_FONT_16_XPM;
break;
case EB_FONT_24:
*size = EB_SIZE_WIDE_FONT_24_XPM;
break;
case EB_FONT_30:
*size = EB_SIZE_WIDE_FONT_30_XPM;
break;
case EB_FONT_48:
*size = EB_SIZE_WIDE_FONT_48_XPM;
break;
default:
error_code = EB_ERR_NO_SUCH_FONT;
goto failed;
}
LOG(("out: eb_wide_font_xpm_size(size=%ld) = %s", (long)*size,
eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
*size = 0;
LOG(("out: eb_wide_font_xpm_size() = %s", eb_error_string(error_code)));
return error_code;
}
/*
* Return required buffer size for a wide font character converted
* to GIF image format.
*/
EB_Error_Code
eb_wide_font_gif_size(EB_Font_Code height, size_t *size)
{
EB_Error_Code error_code;
LOG(("in: eb_wide_font_gif_size(height=%d)", (int)height));
switch (height) {
case EB_FONT_16:
*size = EB_SIZE_WIDE_FONT_16_GIF;
break;
case EB_FONT_24:
*size = EB_SIZE_WIDE_FONT_24_GIF;
break;
case EB_FONT_30:
*size = EB_SIZE_WIDE_FONT_30_GIF;
break;
case EB_FONT_48:
*size = EB_SIZE_WIDE_FONT_48_GIF;
break;
default:
error_code = EB_ERR_NO_SUCH_FONT;
goto failed;
}
LOG(("out: eb_wide_font_gif_size(size=%ld) = %s", (long)*size,
eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
*size = 0;
LOG(("out: eb_wide_font_gif_size() = %s", eb_error_string(error_code)));
return error_code;
}
/*
* Return required buffer size for a wide font character converted
* to BMP image format.
*/
EB_Error_Code
eb_wide_font_bmp_size(EB_Font_Code height, size_t *size)
{
EB_Error_Code error_code;
LOG(("in: eb_wide_font_bmp_size(height=%d)", (int)height));
switch (height) {
case EB_FONT_16:
*size = EB_SIZE_WIDE_FONT_16_BMP;
break;
case EB_FONT_24:
*size = EB_SIZE_WIDE_FONT_24_BMP;
break;
case EB_FONT_30:
*size = EB_SIZE_WIDE_FONT_30_BMP;
break;
case EB_FONT_48:
*size = EB_SIZE_WIDE_FONT_48_BMP;
break;
default:
error_code = EB_ERR_NO_SUCH_FONT;
goto failed;
}
LOG(("out: eb_wide_font_bmp_size(size=%ld) = %s", (long)*size,
eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
*size = 0;
LOG(("out: eb_wide_font_bmp_size() = %s", eb_error_string(error_code)));
return error_code;
}
/*
* Return required buffer size for a wide font character converted
* to PNG image format.
*/
EB_Error_Code
eb_wide_font_png_size(EB_Font_Code height, size_t *size)
{
EB_Error_Code error_code;
LOG(("in: eb_wide_font_png_size(height=%d)", (int)height));
switch (height) {
case EB_FONT_16:
*size = EB_SIZE_WIDE_FONT_16_PNG;
break;
case EB_FONT_24:
*size = EB_SIZE_WIDE_FONT_24_PNG;
break;
case EB_FONT_30:
*size = EB_SIZE_WIDE_FONT_30_PNG;
break;
case EB_FONT_48:
*size = EB_SIZE_WIDE_FONT_48_PNG;
break;
default:
error_code = EB_ERR_NO_SUCH_FONT;
goto failed;
}
LOG(("out: eb_wide_font_png_size(size=%ld) = %s", (long)*size,
eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
/*
* An error occurs...
*/
failed:
*size = 0;
LOG(("out: eb_wide_font_png_size() = %s", eb_error_string(error_code)));
return error_code;
}
/*
* The maximum number of octets in a line in a XBM file.
*/
#define XBM_MAX_OCTETS_A_LINE 12
/*
* The base name of a XBM file.
*/
#define XBM_BASE_NAME "default"
/*
* Convert a bitmap image to XBM format.
*
* It requires four arguements. `xbm' is buffer to store the XBM
* image data. `bitmap', `width', and `height' are bitmap data,
* width, and height of the bitmap image.
*/
EB_Error_Code
eb_bitmap_to_xbm(const char *bitmap, int width, int height, char *xbm,
size_t *xbm_length)
{
char *xbm_p = xbm;
const unsigned char *bitmap_p = (const unsigned char *)bitmap;
int bitmap_size = (width + 7) / 8 * height;
int hex;
int i;
LOG(("in: eb_bitmap_to_xbm(width=%d, height=%d)", width, height));
/*
* Output a header.
*/
sprintf(xbm_p, "#define %s_width %4d\n", XBM_BASE_NAME, width);
xbm_p = strchr(xbm_p, '\n') + 1;
sprintf(xbm_p, "#define %s_height %4d\n", XBM_BASE_NAME, height);
xbm_p = strchr(xbm_p, '\n') + 1;
sprintf(xbm_p, "static unsigned char %s_bits[] = {\n", XBM_BASE_NAME);
xbm_p = strchr(xbm_p, '\n') + 1;
/*
* Output image data.
*/
for (i = 0; i < bitmap_size; i++) {
hex = 0;
hex |= (*bitmap_p & 0x80) ? 0x01 : 0x00;
hex |= (*bitmap_p & 0x40) ? 0x02 : 0x00;
hex |= (*bitmap_p & 0x20) ? 0x04 : 0x00;
hex |= (*bitmap_p & 0x10) ? 0x08 : 0x00;
hex |= (*bitmap_p & 0x08) ? 0x10 : 0x00;
hex |= (*bitmap_p & 0x04) ? 0x20 : 0x00;
hex |= (*bitmap_p & 0x02) ? 0x40 : 0x00;
hex |= (*bitmap_p & 0x01) ? 0x80 : 0x00;
bitmap_p++;
if (i % XBM_MAX_OCTETS_A_LINE != 0) {
sprintf(xbm_p, ", 0x%02x", hex);
xbm_p += 6;
} else if (i == 0) {
sprintf(xbm_p, " 0x%02x", hex);
xbm_p += 7;
} else {
sprintf(xbm_p, ",\n 0x%02x", hex);
xbm_p += 9;
}
}
/*
* Output a footer.
*/
memcpy(xbm_p, "};\n", 3);
xbm_p += 3;
*xbm_length = xbm_p - xbm;
LOG(("out: eb_bitmap_to_xbm(xbm_length=%ld) = %s",
(long)(xbm_p - xbm), eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
}
/*
* The base name of a XPM file.
*/
#define XPM_BASE_NAME "default"
/*
* The foreground and background colors of XPM image.
*/
#define XPM_FOREGROUND_COLOR "Black"
#define XPM_BACKGROUND_COLOR "None"
/*
* Convert a bitmap image to XPM format.
*
* It requires four arguements. `xpm' is buffer to store the XPM
* image data. `bitmap', `width', and `height' are bitmap data,
* width, and height of the bitmap image.
*/
EB_Error_Code
eb_bitmap_to_xpm(const char *bitmap, int width, int height, char *xpm,
size_t *xpm_length)
{
char *xpm_p = xpm;
const unsigned char *bitmap_p = (const unsigned char *)bitmap;
int i, j;
LOG(("in: eb_bitmap_to_xpm(width=%d, height=%d)", width, height));
/*
* Output a header.
*/
sprintf(xpm_p, "/* XPM */\n");
xpm_p = strchr(xpm_p, '\n') + 1;
sprintf(xpm_p, "static char * %s[] = {\n", XPM_BASE_NAME);
xpm_p = strchr(xpm_p, '\n') + 1;
sprintf(xpm_p, "\"%d %d 2 1\",\n", width, height);
xpm_p = strchr(xpm_p, '\n') + 1;
sprintf(xpm_p, "\" c %s\",\n", XPM_BACKGROUND_COLOR);
xpm_p = strchr(xpm_p, '\n') + 1;
sprintf(xpm_p, "\". c %s\",\n", XPM_FOREGROUND_COLOR);
xpm_p = strchr(xpm_p, '\n') + 1;
/*
* Output image data.
*/
for (i = 0; i < height; i++) {
if (0 < i) {
strcpy(xpm_p, "\",\n\"");
xpm_p += 4;
} else {
*xpm_p++ = '\"';
}
for (j = 0; j + 7 < width; j += 8, bitmap_p++) {
*xpm_p++ = (*bitmap_p & 0x80) ? '.' : ' ';
*xpm_p++ = (*bitmap_p & 0x40) ? '.' : ' ';
*xpm_p++ = (*bitmap_p & 0x20) ? '.' : ' ';
*xpm_p++ = (*bitmap_p & 0x10) ? '.' : ' ';
*xpm_p++ = (*bitmap_p & 0x08) ? '.' : ' ';
*xpm_p++ = (*bitmap_p & 0x04) ? '.' : ' ';
*xpm_p++ = (*bitmap_p & 0x02) ? '.' : ' ';
*xpm_p++ = (*bitmap_p & 0x01) ? '.' : ' ';
}
if (j < width) {
if (j++ < width)
*xpm_p++ = (*bitmap_p & 0x80) ? '.' : ' ';
if (j++ < width)
*xpm_p++ = (*bitmap_p & 0x40) ? '.' : ' ';
if (j++ < width)
*xpm_p++ = (*bitmap_p & 0x20) ? '.' : ' ';
if (j++ < width)
*xpm_p++ = (*bitmap_p & 0x10) ? '.' : ' ';
if (j++ < width)
*xpm_p++ = (*bitmap_p & 0x08) ? '.' : ' ';
if (j++ < width)
*xpm_p++ = (*bitmap_p & 0x04) ? '.' : ' ';
if (j++ < width)
*xpm_p++ = (*bitmap_p & 0x02) ? '.' : ' ';
if (j++ < width)
*xpm_p++ = (*bitmap_p & 0x01) ? '.' : ' ';
bitmap_p++;
}
}
/*
* Output a footer.
*/
memcpy(xpm_p, "\"};\n", 4);
xpm_p += 4;
if (xpm_length != NULL)
*xpm_length = xpm_p - xpm;
LOG(("out: eb_bitmap_to_xpm(xpm_length=%ld) = %s",
(long)(xpm_p - xpm), eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
}
/*
* The Foreground and background colors of GIF image.
*/
#define GIF_FOREGROUND_COLOR 0x000000
#define GIF_BACKGROUND_COLOR 0xffffff
/*
* The preamble of GIF image.
*/
#define GIF_PREAMBLE_LENGTH 38
static const unsigned char gif_preamble[GIF_PREAMBLE_LENGTH] = {
/*
* Header. (6 bytes)
*/
'G', 'I', 'F', '8', '9', 'a',
/*
* Logical Screen Descriptor. (7 bytes)
* global color table flag = 1.
* color resolution = 1 - 1 = 0.
* sort flag = 0.
* size of global color table = 1 - 1 = 0.
* background color index = 0.
* the pixel aspect ratio = 0 (unused)
* Logical screen width and height are set at run time.
*/
0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00,
/*
* Global Color Table. (6 bytes)
* These are set at run time.
*/
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/*
* Graphic Control Extension. (8 bytes)
* disposal method = 0.
* user input flag = 0.
* transparency flag = 1.
* delay time = 0.
* transparent color index = 0.
*/
0x21, 0xf9, 0x04, 0x01, 0x00, 0x00, 0x00, 0x00,
/*
* Image Descriptor. (10 bytes)
* image left position = 0.
* image top position = 0.
* local color table flag = 0.
* interlace flag = 0.
* sort flag = 0.
* size of local color table = 0.
* Image width and height are set at run time.
*/
0x2c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
/*
* Code size. (1byte)
*/
0x03
};
/*
* Convert a bitmap image to GIF format.
*
* It requires four arguements. `gif' is buffer to store the GIF
* image data. `bitmap', `width', and `height' are bitmap data,
* width, and height of the bitmap image.
*
* Note: This GIF image doesn't use LZW because of patent.
*/
EB_Error_Code
eb_bitmap_to_gif(const char *bitmap, int width, int height, char *gif,
size_t *gif_length)
{
unsigned char *gif_p = (unsigned char *)gif;
const unsigned char *bitmap_p = (const unsigned char *)bitmap;
int i, j;
LOG(("in: eb_bitmap_to_gif(width=%d, height=%d)", width, height));
/*
* Copy the default preamble.
*/
memcpy(gif_p, gif_preamble, GIF_PREAMBLE_LENGTH);
/*
* Set logical screen width and height.
*/
gif_p[6] = width & 0xff;
gif_p[7] = (width >> 8) & 0xff;
gif_p[8] = height & 0xff;
gif_p[9] = (height >> 8) & 0xff;
/*
* Set global colors.
*/
gif_p[13] = (GIF_BACKGROUND_COLOR >> 16) & 0xff;
gif_p[14] = (GIF_BACKGROUND_COLOR >> 8) & 0xff;
gif_p[15] = GIF_BACKGROUND_COLOR & 0xff;
gif_p[16] = (GIF_FOREGROUND_COLOR >> 16) & 0xff;
gif_p[17] = (GIF_FOREGROUND_COLOR >> 8) & 0xff;
gif_p[18] = GIF_FOREGROUND_COLOR & 0xff;
/*
* Set image width and height.
*/
gif_p[32] = width & 0xff;
gif_p[33] = (width >> 8) & 0xff;
gif_p[34] = height & 0xff;
gif_p[35] = (height >> 8) & 0xff;
gif_p += GIF_PREAMBLE_LENGTH;
/*
* Output image data.
*/
for (i = 0; i < height; i++) {
*gif_p++ = (unsigned char)width;
for (j = 0; j + 7 < width; j += 8, bitmap_p++) {
*gif_p++ = (*bitmap_p & 0x80) ? 0x81 : 0x80;
*gif_p++ = (*bitmap_p & 0x40) ? 0x81 : 0x80;
*gif_p++ = (*bitmap_p & 0x20) ? 0x81 : 0x80;
*gif_p++ = (*bitmap_p & 0x10) ? 0x81 : 0x80;
*gif_p++ = (*bitmap_p & 0x08) ? 0x81 : 0x80;
*gif_p++ = (*bitmap_p & 0x04) ? 0x81 : 0x80;
*gif_p++ = (*bitmap_p & 0x02) ? 0x81 : 0x80;
*gif_p++ = (*bitmap_p & 0x01) ? 0x81 : 0x80;
}
if (j < width) {
if (j++ < width)
*gif_p++ = (*bitmap_p & 0x80) ? 0x81 : 0x80;
if (j++ < width)
*gif_p++ = (*bitmap_p & 0x40) ? 0x81 : 0x80;
if (j++ < width)
*gif_p++ = (*bitmap_p & 0x20) ? 0x81 : 0x80;
if (j++ < width)
*gif_p++ = (*bitmap_p & 0x10) ? 0x81 : 0x80;
if (j++ < width)
*gif_p++ = (*bitmap_p & 0x08) ? 0x81 : 0x80;
if (j++ < width)
*gif_p++ = (*bitmap_p & 0x04) ? 0x81 : 0x80;
if (j++ < width)
*gif_p++ = (*bitmap_p & 0x02) ? 0x81 : 0x80;
if (j++ < width)
*gif_p++ = (*bitmap_p & 0x01) ? 0x81 : 0x80;
bitmap_p++;
}
}
/*
* Output a trailer.
*/
memcpy(gif_p, "\001\011\000\073", 4);
gif_p += 4;
if (gif_length != NULL)
*gif_length = ((char *)gif_p - gif);
LOG(("out: eb_bitmap_to_gif(gif_length=%ld) = %s",
(long)((char *)gif_p - gif), eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
}
/*
* The preamble of BMP image.
*/
#define BMP_PREAMBLE_LENGTH 62
static const unsigned char bmp_preamble[] = {
/* Type. */
'B', 'M',
/* File size. (set at run time) */
0x00, 0x00, 0x00, 0x00,
/* Reserved. */
0x00, 0x00, 0x00, 0x00,
/* Offset of bitmap bits part. */
0x3e, 0x00, 0x00, 0x00,
/* Size of bitmap info part. */
0x28, 0x00, 0x00, 0x00,
/* Width. (set at run time) */
0x00, 0x00, 0x00, 0x00,
/* Height. (set at run time) */
0x00, 0x00, 0x00, 0x00,
/* Planes. */
0x01, 0x00,
/* Bits per pixels. */
0x01, 0x00,
/* Compression mode. */
0x00, 0x00, 0x00, 0x00,
/* Size of bitmap bits part. (set at run time) */
0x00, 0x00, 0x00, 0x00,
/* X Pixels per meter. */
0x6d, 0x0b, 0x00, 0x00,
/* Y Pixels per meter. */
0x6d, 0x0b, 0x00, 0x00,
/* Colors */
0x02, 0x00, 0x00, 0x00,
/* Important colors */
0x02, 0x00, 0x00, 0x00,
/* RGB quad of color 0 RGB quad of color 1 */
0xff, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00,
};
/*
* Convert a bitmap image to BMP format.
*
* It requires four arguements. `bmp' is buffer to store the BMP
* image data. `bitmap', `width', and `height' are bitmap data,
* width, and height of the bitmap image.
*/
EB_Error_Code
eb_bitmap_to_bmp(const char *bitmap, int width, int height, char *bmp,
size_t *bmp_length)
{
unsigned char *bmp_p = (unsigned char *)bmp;
size_t data_size;
size_t file_size;
size_t line_pad_length;
size_t bitmap_line_length;
int i, j;
LOG(("in: eb_bitmap_to_bmp(width=%d, height=%d)", width, height));
if (width % 32 == 0)
line_pad_length = 0;
else if (width % 32 <= 8)
line_pad_length = 3;
else if (width % 32 <= 16)
line_pad_length = 2;
else if (width % 32 <= 24)
line_pad_length = 1;
else
line_pad_length = 0;
data_size = (width / 2 + line_pad_length) * height;
file_size = data_size + BMP_PREAMBLE_LENGTH;
/*
* Set BMP preamble.
*/
memcpy(bmp_p, bmp_preamble, BMP_PREAMBLE_LENGTH);
bmp_p[2] = file_size & 0xff;
bmp_p[3] = (file_size >> 8) & 0xff;
bmp_p[4] = (file_size >> 16) & 0xff;
bmp_p[5] = (file_size >> 24) & 0xff;
bmp_p[18] = width & 0xff;
bmp_p[19] = (width >> 8) & 0xff;
bmp_p[20] = (width >> 16) & 0xff;
bmp_p[21] = (width >> 24) & 0xff;
bmp_p[22] = height & 0xff;
bmp_p[23] = (height >> 8) & 0xff;
bmp_p[24] = (height >> 16) & 0xff;
bmp_p[25] = (height >> 24) & 0xff;
bmp_p[34] = data_size & 0xff;
bmp_p[35] = (data_size >> 8) & 0xff;
bmp_p[36] = (data_size >> 16) & 0xff;
bmp_p[37] = (data_size >> 24) & 0xff;
bmp_p += BMP_PREAMBLE_LENGTH;
bitmap_line_length = (width + 7) / 8;
for (i = height - 1; 0 <= i; i--) {
memcpy(bmp_p, bitmap + bitmap_line_length * i, bitmap_line_length);
bmp_p += bitmap_line_length;
for (j = 0; j < line_pad_length; j++, bmp_p++)
*bmp_p = 0x00;
}
if (bmp_length != NULL)
*bmp_length = ((char *)bmp_p - bmp);
LOG(("out: eb_bitmap_to_bmp(bmp_length=%ld) = %s",
(long)((char *)bmp_p - bmp), eb_error_string(EB_SUCCESS)));
return EB_SUCCESS;
}
/*
* The Foreground and background colors of PNG image.
*/
#define PNG_FOREGROUND_COLOR 0x000000
#define PNG_BACKGROUND_COLOR 0xffffff
/*
* The preamble of PNG image.
*/
static const unsigned char png_preamble[] = {
/*
* PNG file signature (8 bytes)
*/
0x89, 'P', 'N', 'G', '\r', '\n', 0x1a, '\n',
/*
* IHDR(Image Header) Chunk (25 bytes)
*/
/* Size of IHDR. */
0x00, 0x00, 0x00, 0x0d,
'I', 'H', 'D', 'R',
/* Width. (set at run time) */
0x00, 0x00, 0x00, 0x00,
/* Height. (set at run time) */
0x00, 0x00, 0x00, 0x00,
/* misc. */
0x01, 0x03, 0x00, 0x00, 0x00,
/* CRC (set at run time) */
0x00, 0x00, 0x00, 0x00,