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https://github.com/rupertwh/bmplib.git
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052c5ade33
* add dll import/export declarations * add casts to avoid compiler warnings * fix long vs long long error, unearthed by compiling under Windows Compiling with Visual Studio still needs some manual work that is otherwise done by meson: * create config.h * compile and run gen-huffman.c and gen-reversebits.c to create the header files huffman-codes.h and reversebits.h gitignore visual studio
123 lines
2.9 KiB
C
123 lines
2.9 KiB
C
/* bmplib - bmp-read-loadindexed.c
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*
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* Copyright (c) 2024, Rupert Weber.
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*
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* This file is part of bmplib.
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* bmplib is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library.
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* If not, see <https://www.gnu.org/licenses/>
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#define BMPLIB_LIB
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#include "config.h"
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#include "bmplib.h"
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#include "logging.h"
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#include "bmp-common.h"
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#include "bmp-read.h"
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/* Functions in this file are for retreiving an indexed BMP as
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* index + palette. (Unlike the bmplib default which is to
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* return 24bit RGB data.)
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*/
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/********************************************************
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* bmpread_num_palette_colors
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*
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* will return the number of palette-color. For non-
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* indexed BMPs, 0 is returned.
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*******************************************************/
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API int bmpread_num_palette_colors(BMPHANDLE h)
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{
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BMPREAD rp;
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if (!(h && cm_check_is_read_handle(h)))
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return 0;
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rp = (BMPREAD)(void*)h;
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if (rp->palette)
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return rp->palette->numcolors;
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return 0;
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}
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/********************************************************
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* bmpread_load_palette
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* palette entries are always passed on as a
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* character array, 4 bytes per color (R-G-B-0)
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*******************************************************/
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API BMPRESULT bmpread_load_palette(BMPHANDLE h, unsigned char **palette)
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{
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BMPREAD rp;
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int i,c;
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size_t memsize;
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if (!(h && cm_check_is_read_handle(h)))
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return 0;
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rp = (BMPREAD)(void*)h;
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if (!rp->getinfo_called) {
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logerr(rp->log, "Must call bmpread_load_info() before loading palette");
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return BMP_RESULT_ERROR;
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}
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if (!rp->palette) {
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logerr(rp->log, "Image has no palette");
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return BMP_RESULT_ERROR;
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}
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if (!palette) {
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logerr(rp->log, "palette is NULL");
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return BMP_RESULT_ERROR;
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}
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memsize = rp->palette->numcolors * 4;
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if (!*palette) {
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if (!(*palette = malloc(memsize))) {
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logsyserr(rp->log, "allocating palette");
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return BMP_RESULT_ERROR;
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}
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}
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memset(*palette, 0, memsize);
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/* irreversible. image will be returned as indexed pixels */
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if (!rp->result_indexed) {
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rp->result_indexed = TRUE;
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rp->dimensions_queried = FALSE;
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rp->dim_queried_channels = FALSE;
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rp->result_channels = 1;
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if (!br_set_resultbits(rp))
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return BMP_RESULT_ERROR;
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}
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for (i = 0; i < rp->palette->numcolors; i++) {
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for (c = 0; c < 3; c++) {
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(*palette)[4*i + c] = rp->palette->color[i].value[c];
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}
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}
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return BMP_RESULT_OK;
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}
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