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bmp-write.c
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/* bmplib - bmp-write.c
*
* Copyright (c) 2024, Rupert Weber.
*
* This file is part of bmplib.
* bmplib is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library.
* If not, see <https://www.gnu.org/licenses/>
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <limits.h>
#include <stdarg.h>
#include <stdbool.h>
#include <assert.h>
#include <math.h>
#define BMPLIB_LIB
#include "config.h"
#include "bmplib.h"
#include "logging.h"
#include "bmp-common.h"
#include "huffman.h"
#include "bmp-write.h"
static void s_decide_outformat(BMPWRITE_R wp);
static bool s_write_palette(BMPWRITE_R wp);
static bool s_write_bmp_file_header(BMPWRITE_R wp);
static bool s_write_bmp_info_header(BMPWRITE_R wp);
static inline int s_write_one_byte(int byte, BMPWRITE_R wp);
static bool s_save_header(BMPWRITE_R wp);
static bool s_try_saving_image_size(BMPWRITE_R wp);
static int s_calc_mask_values(BMPWRITE_R wp);
static bool s_is_setting_compatible(BMPWRITE_R wp, const char *setting, ...);
static bool s_check_already_saved(BMPWRITE_R wp);
/*****************************************************************************
* bmpwrite_new
*****************************************************************************/
API BMPHANDLE bmpwrite_new(FILE *file)
{
BMPWRITE wp = NULL;
if (!(wp = malloc(sizeof *wp))) {
goto abort;
}
memset(wp, 0, sizeof *wp);
wp->magic = HMAGIC_WRITE;
wp->rle_requested = BMP_RLE_NONE;
wp->outorientation = BMP_ORIENT_BOTTOMUP;
wp->source_format = BMP_FORMAT_INT;
if (!(wp->log = logcreate()))
goto abort;
if (!file) {
logerr(wp->log, "Must supply file handle");
goto abort;
}
wp->file = file;
if (!(wp->fh = malloc(sizeof *wp->fh))) {
logsyserr(wp->log, "allocating bmp file header");
goto abort;
}
memset(wp->fh, 0, sizeof *wp->fh);
if (!(wp->ih = malloc(sizeof *wp->ih))) {
logsyserr(wp->log, "allocating bmp info header");
goto abort;
}
memset(wp->ih, 0, sizeof *wp->ih);
/* In case we need to write V4/V5 header: */
wp->ih->cstype = LCS_WINDOWS_COLOR_SPACE;
return (BMPHANDLE)(void*)wp;
abort:
if (wp)
bw_free(wp);
return NULL;
}
/*****************************************************************************
* bmpwrite_set_dimensions
*****************************************************************************/
API BMPRESULT bmpwrite_set_dimensions(BMPHANDLE h,
unsigned width,
unsigned height,
unsigned source_channels,
unsigned source_bitsperchannel)
{
BMPWRITE wp;
if (!(wp = cm_write_handle(h)))
return BMP_RESULT_ERROR;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
if (!(s_is_setting_compatible(wp, "srcchannels", source_channels) &&
s_is_setting_compatible(wp, "srcbits", source_bitsperchannel)))
return BMP_RESULT_ERROR;
if (!cm_is_one_of(3, source_bitsperchannel, 8, 16, 32)) {
logerr(wp->log, "Invalid number of bits per channel: %d",
(int) source_bitsperchannel);
return BMP_RESULT_ERROR;
}
if (!cm_is_one_of(4, source_channels, 3, 4, 1, 2)) {
logerr(wp->log, "Invalid number of channels: %d", (int) source_channels);
return BMP_RESULT_ERROR;
}
wp->source_bytes_per_pixel = source_bitsperchannel / 8 * source_channels;
if (width > INT32_MAX || height > INT32_MAX ||
width < 1 || height < 1 ||
(uint64_t) width * height > SIZE_MAX / wp->source_bytes_per_pixel) {
logerr(wp->log, "Invalid dimensions %ux%ux%u @ %ubits",
width, height, source_channels,
source_bitsperchannel);
return BMP_RESULT_ERROR;
}
wp->width = (int) width;
wp->height = (int) height;
wp->source_channels = (int) source_channels;
wp->source_bitsperchannel = (int) source_bitsperchannel;
wp->dimensions_set = true;
return BMP_RESULT_OK;
}
/*****************************************************************************
* bw_set_number_format
*****************************************************************************/
BMPRESULT bw_set_number_format(BMPWRITE_R wp, enum BmpFormat format)
{
if (format == wp->source_format)
return BMP_RESULT_OK;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
if (!s_is_setting_compatible(wp, "format", format))
return BMP_RESULT_ERROR;
wp->source_format = format;
return BMP_RESULT_OK;
}
/*****************************************************************************
* bmpwrite_set_output_bits
*****************************************************************************/
API BMPRESULT bmpwrite_set_output_bits(BMPHANDLE h, int red, int green, int blue, int alpha)
{
BMPWRITE wp;
if (!(wp = cm_write_handle(h)))
return BMP_RESULT_ERROR;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
if (!s_is_setting_compatible(wp, "outbits"))
return BMP_RESULT_ERROR;
if (!(cm_all_positive_int(4, red, green, blue, alpha) &&
cm_all_lessoreq_int(32, 4, red, green, blue, alpha) &&
red + green + blue > 0 &&
red + green + blue + alpha <= 32 )) {
logerr(wp->log, "Invalid output bit depths specified: %d-%d-%d - %d",
red, green, blue, alpha);
wp->outbits_set = false;
return BMP_RESULT_ERROR;
}
wp->cmask.bits.red = red;
wp->cmask.bits.green = green;
wp->cmask.bits.blue = blue;
wp->cmask.bits.alpha = alpha;
wp->outbits_set = true;
return BMP_RESULT_OK;
}
/*****************************************************************************
* bmpwrite_set_palette
*****************************************************************************/
API BMPRESULT bmpwrite_set_palette(BMPHANDLE h, int numcolors,
const unsigned char *palette)
{
BMPWRITE wp;
int i, c;
size_t memsize;
if (!(wp = cm_write_handle(h)))
return BMP_RESULT_ERROR;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
if (wp->palette) {
logerr(wp->log, "Palette already set. Cannot set twice");
return BMP_RESULT_ERROR;
}
if (!s_is_setting_compatible(wp, "indexed"))
return BMP_RESULT_ERROR;
if (numcolors < 2 || numcolors > 256) {
logerr(wp->log, "Invalid number of colors for palette (%d)",
numcolors);
return BMP_RESULT_ERROR;
}
memsize = sizeof *wp->palette + numcolors * sizeof wp->palette->color[0];
if (!(wp->palette = malloc(memsize))) {
logsyserr(wp->log, "Allocating palette");
return BMP_RESULT_ERROR;
}
memset(wp->palette, 0, memsize);
wp->palette->numcolors = numcolors;
for (i = 0; i < numcolors; i++) {
for (c = 0; c < 3; c++) {
wp->palette->color[i].value[c] = palette[4*i + c];
}
}
wp->palette_size = 4 * numcolors;
return BMP_RESULT_OK;
}
/*****************************************************************************
* bmpwrite_set_orientation
*****************************************************************************/
API BMPRESULT bmpwrite_set_orientation(BMPHANDLE h, enum BmpOrient orientation)
{
BMPWRITE wp;
if (!(wp = cm_write_handle(h)))
return BMP_RESULT_ERROR;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
switch (orientation) {
case BMP_ORIENT_TOPDOWN:
if (wp->rle_requested != BMP_RLE_NONE) {
logerr(wp->log, "Topdown is invalid with RLE BMPs");
return BMP_RESULT_ERROR;
}
break;
case BMP_ORIENT_BOTTOMUP:
/* always ok */
break;
default:
logerr(wp->log, "Invalid orientation (%d)", (int) orientation);
return BMP_RESULT_ERROR;
}
wp->outorientation = orientation;
return BMP_RESULT_OK;
}
/*****************************************************************************
* bmpwrite_set_rle
*****************************************************************************/
API BMPRESULT bmpwrite_set_rle(BMPHANDLE h, enum BmpRLEtype type)
{
BMPWRITE wp;
if (!(wp = cm_write_handle(h)))
return BMP_RESULT_ERROR;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
if (!s_is_setting_compatible(wp, "rle", type))
return BMP_RESULT_ERROR;
if (!cm_is_one_of(3, (int) type, (int) BMP_RLE_NONE, (int) BMP_RLE_AUTO, (int) BMP_RLE_RLE8)) {
logerr(wp->log, "Invalid RLE type specified (%d)", (int) type);
return BMP_RESULT_ERROR;
}
wp->rle_requested = type;
return BMP_RESULT_OK;
}
/*****************************************************************************
* bmpwrite_set_resolution
*****************************************************************************/
API BMPRESULT bmpwrite_set_resolution(BMPHANDLE h, int xdpi, int ydpi)
{
BMPWRITE wp;
if (!(wp = cm_write_handle(h)))
return BMP_RESULT_ERROR;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
wp->ih->xpelspermeter = (LONG) (100.0 / 2.54 * xdpi + 0.5);
wp->ih->ypelspermeter = (LONG) (100.0 / 2.54 * ydpi + 0.5);
return BMP_RESULT_OK;
}
/*****************************************************************************
* bmpwrite_allow_2bit
*****************************************************************************/
API BMPRESULT bmpwrite_allow_2bit(BMPHANDLE h)
{
BMPWRITE wp;
if (!(wp = cm_write_handle(h)))
return BMP_RESULT_ERROR;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
wp->allow_2bit = true;
return BMP_RESULT_OK;
}
/*****************************************************************************
* bmpwrite_allow_huffman
*****************************************************************************/
API BMPRESULT bmpwrite_allow_huffman(BMPHANDLE h)
{
BMPWRITE wp;
if (!(wp = cm_write_handle(h)))
return BMP_RESULT_ERROR;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
wp->allow_huffman = true;
return BMP_RESULT_OK;
}
/*****************************************************************************
* bmpwrite_allow_rle24
*****************************************************************************/
API BMPRESULT bmpwrite_allow_rle24(BMPHANDLE h)
{
BMPWRITE wp;
if (!(wp = cm_write_handle(h)))
return BMP_RESULT_ERROR;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
wp->allow_rle24 = true;
return BMP_RESULT_OK;
}
/*****************************************************************************
* bmpwrite_set_64bit
*****************************************************************************/
API BMPRESULT bmpwrite_set_64bit(BMPHANDLE h)
{
BMPWRITE wp;
if (!(wp = cm_write_handle(h)))
return BMP_RESULT_ERROR;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
if (!s_is_setting_compatible(wp, "64bit"))
return BMP_RESULT_ERROR;
wp->out64bit = true;
return BMP_RESULT_OK;
}
/*****************************************************************************
* s_check_already_saved
*****************************************************************************/
static bool s_check_already_saved(BMPWRITE_R wp)
{
if (wp->saveimage_done) {
logerr(wp->log, "Image already saved.");
return true;
}
return false;
}
/*****************************************************************************
* s_is_setting_compatible
*
* setting: "outbits", "srcbits", "srcchannels",
* "format", "indexed", "64bit", "rle"
*****************************************************************************/
static bool s_is_setting_compatible(BMPWRITE_R wp, const char *setting, ...)
{
int channels, bits;
enum BmpFormat format;
enum BmpRLEtype rle;
enum BmpOrient orientation;
int ret = true;
va_list args;
va_start(args, setting);
if (!strcmp(setting, "outbits")) {
if (wp->palette || wp->out64bit || (wp->rle_requested != BMP_RLE_NONE)) {
logerr(wp->log, "output bits cannot be set with indexed, RLE, "
"or 64bit BMPs");
ret = false;
}
} else if (!strcmp(setting, "srcbits")) {
bits = va_arg(args, int);
if (wp->palette && bits != 8) {
logerr(wp->log, "indexed images must be 8 bits (not %d)", bits);
ret = false;
} else if (wp->source_format == BMP_FORMAT_FLOAT && bits != 32) {
logerr(wp->log, "float images must be 32 bits per channel (not %d)", bits);
ret = false;
} else if (wp->source_format == BMP_FORMAT_S2_13 && bits != 16) {
logerr(wp->log, "s2.13 images must be 16 bits per channel (not %d)", bits);
ret = false;
}
} else if (!strcmp(setting, "srcchannels")) {
channels = va_arg(args, int);
if (wp->palette && (channels != 1)) {
logerr(wp->log, "Indexed images must have 1 channel (not %d)", channels);
ret = false;
}
if (wp->out64bit && (channels != 3 && channels != 4)) {
logerr(wp->log, "64bit images must have 3 or 4 channels (not %d)", channels);
ret = false;
}
} else if (!strcmp(setting, "indexed")) {
if (wp->out64bit) {
logerr(wp->log, "64bit BMPs cannot be indexed");
ret = false;
}
if (wp->outbits_set) {
logerr(wp->log, "BMPs with specified channel bits cannot be indexed");
ret = false;
}
if (wp->source_format != BMP_FORMAT_INT) {
logerr(wp->log, "Indexed image must have INT format (not %s)",
cm_format_name(wp->source_format));
ret = false;
}
if (wp->dimensions_set) {
if (!(wp->source_channels == 1 && wp->source_bitsperchannel == 8)) {
logerr (wp->log, "Indexed images must be 1 channel, 8 bits");
ret = false;
}
}
} else if (!strcmp(setting, "format")) {
format = va_arg(args, enum BmpFormat);
switch (format) {
case BMP_FORMAT_FLOAT:
if (wp->dimensions_set && wp->source_bitsperchannel != 32) {
logerr(wp->log, "float cannot be %d bits per pixel",
wp->source_bitsperchannel);
ret = false;
}
if (wp->palette) {
logerr(wp->log, "float cannot be used for indexed images");
ret = false;
}
break;
case BMP_FORMAT_S2_13:
if (wp->dimensions_set && wp->source_bitsperchannel != 16) {
logerr(wp->log, "s2.13 cannot be %d bits per pixel",
wp->source_bitsperchannel);
ret = false;
}
if (wp->palette) {
logerr(wp->log, "s2.13 cannot be used for indexed images");
ret = false;
}
break;
default:
/* INT is ok with everything */
break;
}
} else if (!strcmp(setting, "rle")) {
rle = va_arg(args, enum BmpRLEtype);
if (rle == BMP_RLE_AUTO || rle == BMP_RLE_RLE8) {
if (wp->outorientation != BMP_ORIENT_BOTTOMUP) {
logerr(wp->log, "RLE is invalid with top-down BMPs");
ret = false;
}
}
} else if (!strcmp(setting, "orientation")) {
orientation = va_arg(args, enum BmpOrient);
if (orientation == BMP_ORIENT_TOPDOWN) {
if (wp->rle_requested != BMP_RLE_NONE) {
logerr(wp->log, "RLE is invalid with top-down BMPs");
ret = false;
}
}
} else if (!strcmp(setting, "64bit")) {
if (wp->palette) {
logerr(wp->log, "Indexed images cannot be 64bit");
ret = false;
}
}
va_end(args);
return ret;
}
/*****************************************************************************
* s_decide_outformat
*****************************************************************************/
static void s_decide_outformat(BMPWRITE_R wp)
{
int bitsum;
uint64_t bitmapsize, filesize, bytes_per_line;
if ((wp->source_channels == 4 || wp->source_channels == 2) &&
((wp->outbits_set && wp->cmask.bits.alpha) || !wp->outbits_set) ) {
wp->has_alpha = true;
} else {
wp->cmask.bits.alpha = 0;
wp->has_alpha = false;
}
if (!wp->outbits_set) {
if (wp->out64bit) {
wp->cmask.bits.red = 16;
wp->cmask.bits.green = 16;
wp->cmask.bits.blue = 16;
wp->cmask.bits.alpha = 16; /* 64bit always has alpha channel */
} else {
wp->cmask.bits.red = wp->cmask.bits.green = wp->cmask.bits.blue = 8;
if (wp->has_alpha)
wp->cmask.bits.alpha = 8;
}
}
bitsum = s_calc_mask_values(wp);
if (wp->palette) {
wp->ih->version = BMPINFO_V3;
wp->ih->size = BMPIHSIZE_V3;
if (wp->rle_requested != BMP_RLE_NONE) {
if (wp->palette->numcolors > 16 ||
wp->rle_requested == BMP_RLE_RLE8) {
wp->rle = 8;
wp->ih->compression = BI_RLE8;
wp->ih->bitcount = 8;
} else if (wp->palette->numcolors > 2 || !wp->allow_huffman) {
wp->rle = 4;
wp->ih->compression = BI_RLE4;
wp->ih->bitcount = 4;
} else {
wp->rle = 1;
wp->ih->compression = BI_OS2_HUFFMAN;
wp->ih->bitcount = 1;
wp->ih->version = BMPINFO_OS22;
wp->ih->size = BMPIHSIZE_OS22;
}
} else {
wp->ih->compression = BI_RGB;
wp->ih->bitcount = 1;
while ((1<<wp->ih->bitcount) < wp->palette->numcolors)
wp->ih->bitcount *= 2;
if (wp->ih->bitcount == 2 && !wp->allow_2bit)
wp->ih->bitcount = 4;
}
} else if (wp->allow_rle24 && wp->source_channels == 3 &&
wp->source_bitsperchannel && wp->rle_requested == BMP_RLE_AUTO) {
wp->rle = 24;
wp->ih->compression = BI_OS2_RLE24;
wp->ih->bitcount = 24;
wp->ih->version = BMPINFO_OS22;
wp->ih->size = BMPIHSIZE_OS22;
} else if (bitsum < 64 && (!cm_all_equal_int(3, (int) wp->cmask.bits.red,
(int) wp->cmask.bits.green,
(int) wp->cmask.bits.blue) ||
wp->has_alpha ||
(wp->cmask.bits.red > 0 &&
wp->cmask.bits.red != 5 &&
wp->cmask.bits.red != 8 ) )) {
/* we need BI_BITFIELDS if any of the following is true and we are not
* writing a 64bit BMP:
* - not all RGB-components have the same bitlength
* - we are writing an alpha-channel
* - bits per component are not either 5 or 8 (which have
* known RI_RGB representation)
*/
wp->ih->version = BMPINFO_V4;
wp->ih->size = BMPIHSIZE_V4;
wp->ih->compression = BI_BITFIELDS; /* do we need BI_ALPHABITFIELDS when alpha is present */
/* or will that just confuse other readers? !!!!! */
if (bitsum <= 16)
wp->ih->bitcount = 16;
else
wp->ih->bitcount = 32;
} else {
/* otherwise, use BI_RGB with either 5 or 8 bits per component
* resulting in bitcount of 16 or 24, or a 64bit BMP with 16 bits/comp.
*/
wp->ih->version = BMPINFO_V3;
wp->ih->size = BMPIHSIZE_V3;
wp->ih->compression = BI_RGB;
wp->ih->bitcount = (bitsum + 7) / 8 * 8;
}
if (wp->palette) {
wp->ih->clrused = wp->palette->numcolors;
} else {
wp->outbytes_per_pixel = wp->ih->bitcount / 8;
if (wp->ih->version >= BMPINFO_V4 && !wp->out64bit) {
wp->ih->redmask = (DWORD) (wp->cmask.mask.red << wp->cmask.shift.red);
wp->ih->greenmask = (DWORD) (wp->cmask.mask.green << wp->cmask.shift.green);
wp->ih->bluemask = (DWORD) (wp->cmask.mask.blue << wp->cmask.shift.blue);
wp->ih->alphamask = (DWORD) (wp->cmask.mask.alpha << wp->cmask.shift.alpha);
}
}
bytes_per_line = ((uint64_t) wp->width * wp->ih->bitcount + 7) / 8;
wp->padding = cm_align4padding(bytes_per_line);
bitmapsize = (bytes_per_line + wp->padding) * wp->height;
filesize = bitmapsize + BMPFHSIZE + wp->ih->size + wp->palette_size;
wp->fh->type = 0x4d42; /* "BM" */
wp->fh->size = (DWORD) ((wp->rle || filesize > UINT32_MAX) ? 0 : filesize);
wp->fh->offbits = BMPFHSIZE + wp->ih->size + wp->palette_size;
wp->ih->width = wp->width;
if (wp->outorientation == BMP_ORIENT_BOTTOMUP)
wp->ih->height = wp->height;
else
wp->ih->height = -wp->height;
wp->ih->planes = 1;
wp->ih->sizeimage = (DWORD) ((wp->rle || bitmapsize > UINT32_MAX) ? 0 : bitmapsize);
}
/*****************************************************************************
* bmpwrite_save_image
*****************************************************************************/
static bool s_save_line_rgb(BMPWRITE_R wp, const unsigned char *line);
static bool s_save_line_rle(BMPWRITE_R wp, const unsigned char *line);
static bool s_save_line_huff(BMPWRITE_R wp, const unsigned char *line);
API BMPRESULT bmpwrite_save_image(BMPHANDLE h, const unsigned char *image)
{
BMPWRITE wp;
size_t offs, linesize;
int y, real_y, res;
if (!(wp = cm_write_handle(h)))
return BMP_RESULT_ERROR;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
if (wp->line_by_line) {
logerr(wp->log, "Cannot switch from line-by-line to saving full image");
return BMP_RESULT_ERROR;
}
if (!s_save_header(wp))
return BMP_RESULT_ERROR;
wp->saveimage_done = true;
wp->bytes_written_before_bitdata = wp->bytes_written;
linesize = (size_t) wp->width * wp->source_bytes_per_pixel;
for (y = 0; y < wp->height; y++) {
real_y = (wp->outorientation == BMP_ORIENT_TOPDOWN) ? y : wp->height - y - 1;
offs = (size_t) real_y * linesize;
switch (wp->rle) {
case 4:
case 8:
case 24:
res = s_save_line_rle(wp, image + offs);
break;
case 1:
res = s_save_line_huff(wp, image + offs);
break;
default:
res = s_save_line_rgb(wp, image + offs);
break;
}
if (!res) {
logerr(wp->log, "failed saving line %d", y);
return BMP_RESULT_ERROR;
}
}
if (wp->rle) {
if (wp->rle > 1) {
if (EOF == s_write_one_byte(0, wp) ||
EOF == s_write_one_byte(1, wp)) {
logsyserr(wp->log, "Writing RLE end-of-file marker");
return BMP_RESULT_ERROR;
}
}
else {
if (!(huff_encode_rtc(wp) && huff_flush(wp))) {
logsyserr(wp->log, "Writing RTC end-of-file marker");
return BMP_RESULT_ERROR;
}
}
s_try_saving_image_size(wp);
}
return BMP_RESULT_OK;
}
/*****************************************************************************
* bmpwrite_save_line
*****************************************************************************/
API BMPRESULT bmpwrite_save_line(BMPHANDLE h, const unsigned char *line)
{
BMPWRITE wp;
int res;
if (!(wp = cm_write_handle(h)))
return BMP_RESULT_ERROR;
if (s_check_already_saved(wp))
return BMP_RESULT_ERROR;
if (!wp->line_by_line) { /* first line */
if (!s_save_header(wp))
goto abort;
wp->bytes_written_before_bitdata = wp->bytes_written;
wp->line_by_line = true;
}
switch (wp->rle) {
case 4:
case 8:
case 24:
res = s_save_line_rle(wp, line);
break;
case 1:
res = s_save_line_huff(wp, line);
break;
default:
res = s_save_line_rgb(wp, line);
break;
}
if (!res)
goto abort;
if (++wp->lbl_y >= wp->height) {
if (wp->rle) {
if (wp->rle > 1) {
if (EOF == s_write_one_byte(0, wp) ||
EOF == s_write_one_byte(1, wp)) {
logsyserr(wp->log, "Writing RLE end-of-file marker");
goto abort;
}
} else {
if (!(huff_encode_rtc(wp) && huff_flush(wp))) {
logsyserr(wp->log, "Writing RTC end-of-file marker");
goto abort;
}
}
s_try_saving_image_size(wp);
}
wp->saveimage_done = true;
}
return BMP_RESULT_OK;
abort:
wp->saveimage_done = true;
return BMP_RESULT_ERROR;
}
/*****************************************************************************
* s_save_header
*****************************************************************************/
static bool s_save_header(BMPWRITE_R wp)
{
if (wp->saveimage_done || wp->line_by_line) {
logerr(wp->log, "Image already saved.");
return false;
}
if (!wp->dimensions_set) {
logerr(wp->log, "Must set dimensions before saving");
return false;
}
s_decide_outformat(wp);
if (!s_write_bmp_file_header(wp)) {
logsyserr(wp->log, "Writing BMP file header");
return false;
}
if (!s_write_bmp_info_header(wp)) {
logsyserr(wp->log, "Writing BMP info header");
return false;
}
if (wp->palette) {
if (!s_write_palette(wp)) {
logsyserr(wp->log, "Couldn't write palette");
return false;
}
}
return true;
}
/*****************************************************************************
* s_try_saving_image_size
*
* For RLE images, we must set the file/bitmap size in
* file- and infoheader. But we don't know the size until
* after the image is saved. Thus, we have to fseek()
* back into the header, which will fail on unseekable
* files like pipes etc.
* We ignore any errors quietly, as there's nothing we
* can do and most (all?) readers ignore those sizes in
* the header, anyway. Same goes for file/bitmap sizes
* which are too big for the respective fields.
*****************************************************************************/
static bool s_try_saving_image_size(BMPWRITE_R wp)
{
uint64_t image_size, file_size;
image_size = wp->bytes_written - wp->bytes_written_before_bitdata;
file_size = wp->bytes_written;
if (fseek(wp->file, 2, SEEK_SET)) /* file header -> bfSize */
return false;
if (file_size <= UINT32_MAX && !write_u32_le(wp->file, (uint32_t) file_size))
return false;
if (fseek(wp->file, 14 + 20, SEEK_SET)) /* info header -> biSizeImage */
return false;
if (image_size <= UINT32_MAX && !write_u32_le(wp->file, (uint32_t) image_size))
return false;
return true;
}
/*****************************************************************************
* s_save_line_rgb
*****************************************************************************/
static inline unsigned long long s_imgrgb_to_outbytes(BMPWRITE_R wp,
const unsigned char *restrict imgpx);
static bool s_save_line_rgb(BMPWRITE_R wp, const unsigned char *line)
{
size_t offs;
unsigned long long bytes = 0;
int i, x, bits_used = 0;
for (x = 0; x < wp->width; x++) {
offs = (size_t) x * (size_t) wp->source_bytes_per_pixel;
if (wp->palette) {
bytes <<= wp->ih->bitcount;
bytes |= line[offs];
bits_used += wp->ih->bitcount;
if (bits_used == 8) {
if (EOF == s_write_one_byte((int)bytes, wp)) {
logsyserr(wp->log, "Writing image to BMP file");
return false;
}
bytes = 0;
bits_used = 0;
}
} else {
bytes = s_imgrgb_to_outbytes(wp, line + offs);
if (bytes == (unsigned long long)-1)
return BMP_RESULT_ERROR;
for (i = 0; i < wp->outbytes_per_pixel; i++) {
if (EOF == s_write_one_byte((bytes >> (8*i)) & 0xff, wp)) {
logsyserr(wp->log, "Writing image to BMP file");
return false;
}
}
}
}
if (wp->palette && bits_used != 0) {
bytes <<= 8 - bits_used;
if (EOF == s_write_one_byte((int)bytes, wp)) {
logsyserr(wp->log, "Writing image to BMP file");
return false;
}
bits_used = 0;
}
for (i = 0; i < wp->padding; i++) {
if (EOF == s_write_one_byte(0, wp)) {
logsyserr(wp->log, "Writing padding bytes to BMP file");
return false;
}
}
return true;
}
/*****************************************************************************
* s_length_of_runs
*
* for RLE-encoding, returns the number of
* pixels in contiguous upcoming groups with
* run-lengths >= minlen. Used to determine if it is
* worthwile to switch from literal run to