281 lines
7.7 KiB
C
281 lines
7.7 KiB
C
/*
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* VARCem Virtual ARchaeological Computer EMulator.
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* An emulator of (mostly) x86-based PC systems and devices,
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* using the ISA,EISA,VLB,MCA and PCI system buses, roughly
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* spanning the era between 1981 and 1995.
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*
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* Provide centralized access to the PNG image handler.
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*
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*
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*
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* Authors: Fred N. van Kempen, <decwiz@yahoo.com>
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*
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* Copyright 2018 Fred N. van Kempen.
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*
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* Redistribution and use in source and binary forms, with
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* or without modification, are permitted provided that the
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* following conditions are met:
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*
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* 1. Redistributions of source code must retain the entire
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* above notice, this list of conditions and the following
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* disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the
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* following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names
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* of its contributors may be used to endorse or promote
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* products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include <errno.h>
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#define PNG_DEBUG 0
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#include <png.h>
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#define HAVE_STDARG_H
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#include <86box/86box.h>
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#include <86box/plat.h>
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#include <86box/plat_dynld.h>
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#include <86box/ui.h>
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#include <86box/video.h>
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#include <86box/png_struct.h>
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#ifdef _WIN32
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# define PATH_PNG_DLL "libpng16-16.dll"
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#elif defined __APPLE__
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# define PATH_PNG_DLL "libpng16.dylib"
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#else
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# define PATH_PNG_DLL "libpng16.so"
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#endif
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#ifndef PNG_Z_DEFAULT_STRATEGY
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# define PNG_Z_DEFAULT_STRATEGY 1
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#endif
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#define PNGFUNC(x) png_##x
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#ifdef ENABLE_PNG_LOG
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int png_do_log = ENABLE_PNG_LOG;
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static void
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png_log(const char *fmt, ...)
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{
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va_list ap;
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if (png_do_log) {
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va_start(ap, fmt);
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pclog_ex(fmt, ap);
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va_end(ap);
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}
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}
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#else
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# define png_log(fmt, ...)
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#endif
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static void
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error_handler(UNUSED(png_structp arg), UNUSED(const char *str))
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{
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png_log("PNG: stream 0x%08lx error '%s'\n", arg, str);
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}
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static void
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warning_handler(UNUSED(png_structp arg), UNUSED(const char *str))
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{
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png_log("PNG: stream 0x%08lx warning '%s'\n", arg, str);
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}
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/* Write the given image as an 8-bit GrayScale PNG image file. */
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int
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png_write_gray(char *fn, int inv, uint8_t *pix, int16_t w, int16_t h)
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{
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png_structp png = NULL;
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png_infop info = NULL;
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png_bytep row;
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FILE *fp;
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/* Create the image file. */
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fp = plat_fopen(fn, "wb");
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if (fp == NULL) {
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/* Yes, this looks weird. */
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if (fp == NULL)
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png_log("PNG: file %s could not be opened for writing!\n", fn);
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else
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error:
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png_log("PNG: fatal error, bailing out, error = %i\n", errno);
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if (png != NULL)
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PNGFUNC(destroy_write_struct)
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(&png, &info);
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if (fp != NULL)
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(void) fclose(fp);
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return 0;
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}
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/* Initialize PNG stuff. */
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png = PNGFUNC(create_write_struct)(PNG_LIBPNG_VER_STRING, NULL,
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error_handler, warning_handler);
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if (png == NULL) {
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png_log("PNG: create_write_struct failed!\n");
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goto error;
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}
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info = PNGFUNC(create_info_struct)(png);
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if (info == NULL) {
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png_log("PNG: create_info_struct failed!\n");
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goto error;
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}
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PNGFUNC(init_io)
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(png, fp);
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PNGFUNC(set_IHDR)
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(png, info, w, h, 8, PNG_COLOR_TYPE_GRAY,
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PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
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PNG_FILTER_TYPE_DEFAULT);
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PNGFUNC(write_info)
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(png, info);
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/* Create a buffer for one scanline of pixels. */
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row = (png_bytep) malloc(PNGFUNC(get_rowbytes)(png, info));
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/* Process all scanlines in the image. */
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for (int16_t y = 0; y < h; y++) {
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for (int16_t x = 0; x < w; x++) {
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/* Copy the pixel data. */
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if (inv)
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row[x] = 255 - pix[(y * w) + x];
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else
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row[x] = pix[(y * w) + x];
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}
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/* Write image to the file. */
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PNGFUNC(write_rows)
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(png, &row, 1);
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}
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/* No longer need the row buffer. */
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free(row);
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PNGFUNC(write_end)
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(png, NULL);
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PNGFUNC(destroy_write_struct)
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(&png, &info);
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/* Clean up. */
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(void) fclose(fp);
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return 1;
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}
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/* Write the given BITMAP-format image as an 8-bit RGBA PNG image file. */
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void
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png_write_rgb(char *fn, uint8_t *pix, int16_t w, int16_t h, uint16_t pitch, PALETTE palcol)
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{
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png_structp png = NULL;
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png_infop info = NULL;
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png_bytep *rows;
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png_color palette[256];
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FILE *fp;
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/* Create the image file. */
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fp = plat_fopen(fn, "wb");
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if (fp == NULL) {
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png_log("PNG: File %s could not be opened for writing!\n", fn);
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error:
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if (png != NULL)
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PNGFUNC(destroy_write_struct)
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(&png, &info);
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if (fp != NULL)
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(void) fclose(fp);
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return;
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}
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/* Initialize PNG stuff. */
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png = PNGFUNC(create_write_struct)(PNG_LIBPNG_VER_STRING, NULL,
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error_handler, warning_handler);
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if (png == NULL) {
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png_log("PNG: create_write_struct failed!\n");
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goto error;
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}
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info = PNGFUNC(create_info_struct)(png);
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if (info == NULL) {
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png_log("PNG: create_info_struct failed!\n");
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goto error;
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}
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/* Finalize the initing of png library */
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PNGFUNC(init_io)
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(png, fp);
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PNGFUNC(set_compression_level)
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(png, 9);
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/* set other zlib parameters */
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PNGFUNC(set_compression_mem_level)
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(png, 8);
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PNGFUNC(set_compression_strategy)
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(png, PNG_Z_DEFAULT_STRATEGY);
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PNGFUNC(set_compression_window_bits)
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(png, 15);
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PNGFUNC(set_compression_method)
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(png, 8);
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PNGFUNC(set_compression_buffer_size)
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(png, 8192);
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PNGFUNC(set_IHDR)
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(png, info, w, h, 8, PNG_COLOR_TYPE_PALETTE,
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PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
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PNG_FILTER_TYPE_DEFAULT);
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for (uint16_t i = 0; i < 256; i++) {
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palette[i].red = palcol[i].r;
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palette[i].green = palcol[i].g;
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palette[i].blue = palcol[i].b;
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}
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PNGFUNC(set_PLTE)
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(png, info, palette, 256);
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/* Create a buffer for scanlines of pixels. */
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rows = (png_bytep *) malloc(sizeof(png_bytep) * h);
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for (int16_t i = 0; i < h; i++) {
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/* Create a buffer for this scanline. */
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rows[i] = (pix + (i * pitch));
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}
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PNGFUNC(set_rows)
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(png, info, rows);
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PNGFUNC(write_png)
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(png, info, 0, NULL);
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/* Clean up. */
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(void) fclose(fp);
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PNGFUNC(destroy_write_struct)
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(&png, &info);
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/* No longer need the row buffers. */
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free(rows);
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}
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