[libpicofe.git] / readpng.c

/*
 * (C) Gražvydas "notaz" Ignotas, 2008-2011
 *
 * This work is licensed under the terms of any of these licenses
 * (at your option):
 *  - GNU GPL, version 2 or later.
 *  - GNU LGPL, version 2.1 or later.
 *  - MAME license.
 * See the COPYING file in the top-level directory.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <png.h>
#include "readpng.h"
#include "lprintf.h"

int readpng(void *dest, const char *fname, readpng_what what, int req_w, int req_h)
{
	FILE *fp;
	png_structp png_ptr = NULL;
	png_infop info_ptr = NULL;
	png_bytepp row_ptr = NULL;
	int ret = -1;

	if (dest == NULL || fname == NULL)
	{
		return -1;
	}

	fp = fopen(fname, "rb");
	if (fp == NULL)
	{
		lprintf(__FILE__ ": failed to open: %s\n", fname);
		return -1;
	}

	png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
	if (!png_ptr)
	{
		lprintf(__FILE__ ": png_create_read_struct() failed\n");
		fclose(fp);
		return -1;
	}

	info_ptr = png_create_info_struct(png_ptr);
	if (!info_ptr)
	{
		lprintf(__FILE__ ": png_create_info_struct() failed\n");
		goto done;
	}

	// Start reading
	png_init_io(png_ptr, fp);
	png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_STRIP_16 | PNG_TRANSFORM_STRIP_ALPHA | PNG_TRANSFORM_PACKING, NULL);
	row_ptr = png_get_rows(png_ptr, info_ptr);
	if (row_ptr == NULL)
	{
		lprintf(__FILE__ ": png_get_rows() failed\n");
		goto done;
	}

	// lprintf("%s: %ix%i @ %ibpp\n", fname, (int)png_get_image_width(png_ptr, info_ptr),
	// 	(int)png_get_image_height(png_ptr, info_ptr), png_get_bit_depth(png_ptr, info_ptr));

	switch (what)
	{
		case READPNG_BG:
		{
			int height, width, h;
			unsigned short *dst = dest;
			if (png_get_bit_depth(png_ptr, info_ptr) != 8)
			{
				lprintf(__FILE__ ": bg image uses %ibpc, needed 8bpc\n", png_get_bit_depth(png_ptr, info_ptr));
				break;
			}
			width = png_get_image_width(png_ptr, info_ptr);
			if (width > req_w)
				width = req_w;
			height = png_get_image_height(png_ptr, info_ptr);
			if (height > req_h)
				height = req_h;

			for (h = 0; h < height; h++)
			{
				unsigned char *src = row_ptr[h];
				int len = width;
				while (len--)
				{
#ifdef PSP
					*dst++ = ((src[2]&0xf8)<<8) | ((src[1]&0xf8)<<3) | (src[0] >> 3); // BGR
#else
					*dst++ = ((src[0]&0xf8)<<8) | ((src[1]&0xf8)<<3) | (src[2] >> 3); // RGB
#endif
					src += 3;
				}
				dst += req_w - width;
			}
			break;
		}

		case READPNG_FONT:
		{
			int x, y, x1, y1;
			unsigned char *dst = dest;
			if (png_get_image_width(png_ptr, info_ptr) != req_w || png_get_image_height(png_ptr, info_ptr) != req_h)
			{
				lprintf(__FILE__ ": unexpected font image size %dx%d, needed %dx%d\n",
					(int)png_get_image_width(png_ptr, info_ptr), (int)png_get_image_height(png_ptr, info_ptr), req_w, req_h);
				break;
			}
			if (png_get_bit_depth(png_ptr, info_ptr) != 8)
			{
				lprintf(__FILE__ ": font image uses %ibpp, needed 8bpp\n", png_get_bit_depth(png_ptr, info_ptr));
				break;
			}
			for (y = 0; y < 16; y++)
			{
				for (x = 0; x < 16; x++)
				{
					/* 16x16 grid of syms */
					int sym_w = req_w / 16;
					int sym_h = req_h / 16;
					for (y1 = 0; y1 < sym_h; y1++)
					{
						unsigned char *src = row_ptr[y*sym_h + y1] + x*sym_w;
						for (x1 = sym_w/2; x1 > 0; x1--, src+=2)
							*dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4);
					}
				}
			}
			break;
		}

		case READPNG_SELECTOR:
		{
			int x1, y1;
			unsigned char *dst = dest;
			if (png_get_image_width(png_ptr, info_ptr) != req_w || png_get_image_height(png_ptr, info_ptr) != req_h)
			{
				lprintf(__FILE__ ": unexpected selector image size %ix%i, needed %dx%d\n",
					(int)png_get_image_width(png_ptr, info_ptr), (int)png_get_image_height(png_ptr, info_ptr), req_w, req_h);
				break;
			}
			if (png_get_bit_depth(png_ptr, info_ptr) != 8)
			{
				lprintf(__FILE__ ": selector image uses %ibpp, needed 8bpp\n", png_get_bit_depth(png_ptr, info_ptr));
				break;
			}
			for (y1 = 0; y1 < req_h; y1++)
			{
				unsigned char *src = row_ptr[y1];
				for (x1 = req_w/2; x1 > 0; x1--, src+=2)
					*dst++ = ((src[0]^0xff) & 0xf0) | ((src[1]^0xff) >> 4);
			}
			break;
		}

		case READPNG_24:
		{
			int height, width, h;
			unsigned char *dst = dest;
			if (png_get_bit_depth(png_ptr, info_ptr) != 8)
			{
				lprintf(__FILE__ ": image uses %ibpc, needed 8bpc\n", png_get_bit_depth(png_ptr, info_ptr));
				break;
			}
			width = png_get_image_width(png_ptr, info_ptr);
			if (width > req_w)
				width = req_w;
			height = png_get_image_height(png_ptr, info_ptr);
			if (height > req_h)
				height = req_h;

			for (h = 0; h < height; h++)
			{
				int len = width;
				unsigned char *src = row_ptr[h];
				dst += (req_w - width) * 3;
				for (len = width; len > 0; len--, dst+=3, src+=3)
					dst[0] = src[2], dst[1] = src[1], dst[2] = src[0];
			}
			break;
		}
	}


	ret = 0;
done:
	png_destroy_read_struct(&png_ptr, info_ptr ? &info_ptr : NULL, (png_infopp)NULL);
	fclose(fp);
	return ret;
}

int writepng(const char *fname, unsigned short *src, int w, int h)
{
	png_structp png_ptr = NULL;
	png_infop info_ptr = NULL;
	png_bytepp row_pointers;
	int i, j, ret = -1;
	FILE *f;

	f = fopen(fname, "wb");
	if (f == NULL) {
		lprintf(__FILE__ ": failed to open \"%s\"\n", fname);
		return -1;
	}

	row_pointers = calloc(h, sizeof(row_pointers[0]));
	if (row_pointers == NULL)
		goto end1;

	for (i = 0; i < h; i++) {
		unsigned char *dst = malloc(w * 3);
		if (dst == NULL)
			goto end2;
		row_pointers[i] = dst;
		for (j = 0; j < w; j++, src++, dst += 3) {
			dst[0] = (*src & 0xf800) >> 8;
			dst[1] = (*src & 0x07e0) >> 3;
			dst[2] = (*src & 0x001f) << 3;
		}
	}

	/* initialize stuff */
	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
	if (png_ptr == NULL) {
		fprintf(stderr, "png_create_write_struct() failed");
		goto end2;
	}

	info_ptr = png_create_info_struct(png_ptr);
	if (info_ptr == NULL) {
		fprintf(stderr, "png_create_info_struct() failed");
		goto end3;
	}

	if (setjmp(png_jmpbuf(png_ptr)) != 0) {
		fprintf(stderr, "error in png code\n");
		goto end4;
	}

	png_init_io(png_ptr, f);

	png_set_IHDR(png_ptr, info_ptr, w, h,
		8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
		PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);

	png_write_info(png_ptr, info_ptr);
	png_write_image(png_ptr, row_pointers);
	png_write_end(png_ptr, NULL);

	ret = 0;

end4:
//	png_destroy_info_struct(png_ptr, &info_ptr); // freed below
end3:
	png_destroy_write_struct(&png_ptr, &info_ptr);
end2:
	for (i = 0; i < h; i++)
		free(row_pointers[i]);
	free(row_pointers);
end1:
	fclose(f);
	return ret;
}
Commit	Line	Data
b7c7cd5d	1	/*
7fd8dbbb	2	* (C) Gražvydas "notaz" Ignotas, 2008-2011
b7c7cd5d	3	*
	4	* This work is licensed under the terms of any of these licenses
	5	* (at your option):
	6	* - GNU GPL, version 2 or later.
	7	* - GNU LGPL, version 2.1 or later.
f89d8471	8	* - MAME license.
b7c7cd5d	9	* See the COPYING file in the top-level directory.
	10	*/
	11
13059a60	12	#include <stdio.h>
7fd8dbbb	13	#include <stdlib.h>
13059a60	14	#include <string.h>
	15	#include <png.h>
	16	#include "readpng.h"
c7a4ff64	17	#include "lprintf.h"
13059a60	18
f6eaae4f	19	int readpng(void dest, const char fname, readpng_what what, int req_w, int req_h)
13059a60	20	{
	21	FILE *fp;
	22	png_structp png_ptr = NULL;
	23	png_infop info_ptr = NULL;
	24	png_bytepp row_ptr = NULL;
ff63afa1	25	int ret = -1;
13059a60	26
	27	if (dest == NULL \|\| fname == NULL)
	28	{
ff63afa1	29	return -1;
13059a60	30	}
	31
	32	fp = fopen(fname, "rb");
	33	if (fp == NULL)
	34	{
c7a4ff64	35	lprintf(__FILE__ ": failed to open: %s\n", fname);
ff63afa1	36	return -1;
13059a60	37	}
	38
	39	png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
	40	if (!png_ptr)
	41	{
c7a4ff64	42	lprintf(__FILE__ ": png_create_read_struct() failed\n");
13059a60	43	fclose(fp);
ff63afa1	44	return -1;
13059a60	45	}
	46
	47	info_ptr = png_create_info_struct(png_ptr);
	48	if (!info_ptr)
	49	{
c7a4ff64	50	lprintf(__FILE__ ": png_create_info_struct() failed\n");
13059a60	51	goto done;
	52	}
	53
	54	// Start reading
	55	png_init_io(png_ptr, fp);
	56	png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_STRIP_16 \| PNG_TRANSFORM_STRIP_ALPHA \| PNG_TRANSFORM_PACKING, NULL);
	57	row_ptr = png_get_rows(png_ptr, info_ptr);
	58	if (row_ptr == NULL)
	59	{
c7a4ff64	60	lprintf(__FILE__ ": png_get_rows() failed\n");
13059a60	61	goto done;
	62	}
	63
a085ae5e	64	// lprintf("%s: %ix%i @ %ibpp\n", fname, (int)png_get_image_width(png_ptr, info_ptr),
a085ae5e	65	// (int)png_get_image_height(png_ptr, info_ptr), png_get_bit_depth(png_ptr, info_ptr));
13059a60	66
	67	switch (what)
	68	{
	69	case READPNG_BG:
	70	{
	71	int height, width, h;
	72	unsigned short *dst = dest;
a085ae5e	73	if (png_get_bit_depth(png_ptr, info_ptr) != 8)
13059a60	74	{
a085ae5e	75	lprintf(__FILE__ ": bg image uses %ibpc, needed 8bpc\n", png_get_bit_depth(png_ptr, info_ptr));
13059a60	76	break;
13059a60	77	}
a085ae5e	78	width = png_get_image_width(png_ptr, info_ptr);
f6eaae4f	79	if (width > req_w)
f6eaae4f	80	width = req_w;
a085ae5e	81	height = png_get_image_height(png_ptr, info_ptr);
	82	if (height > req_h)
	83	height = req_h;
13059a60	84
	85	for (h = 0; h < height; h++)
	86	{
	87	unsigned char *src = row_ptr[h];
	88	int len = width;
	89	while (len--)
	90	{
703e4c7b	91	#ifdef PSP
	92	*dst++ = ((src[2]&0xf8)<<8) \| ((src[1]&0xf8)<<3) \| (src[0] >> 3); // BGR
	93	#else
	94	*dst++ = ((src[0]&0xf8)<<8) \| ((src[1]&0xf8)<<3) \| (src[2] >> 3); // RGB
	95	#endif
13059a60	96	src += 3;
13059a60	97	}
f6eaae4f	98	dst += req_w - width;
13059a60	99	}
	100	break;
	101	}
	102
	103	case READPNG_FONT:
	104	{
	105	int x, y, x1, y1;
	106	unsigned char *dst = dest;
a085ae5e	107	if (png_get_image_width(png_ptr, info_ptr) != req_w \|\| png_get_image_height(png_ptr, info_ptr) != req_h)
13059a60	108	{
f6eaae4f	109	lprintf(__FILE__ ": unexpected font image size %dx%d, needed %dx%d\n",
a085ae5e	110	(int)png_get_image_width(png_ptr, info_ptr), (int)png_get_image_height(png_ptr, info_ptr), req_w, req_h);
13059a60	111	break;
13059a60	112	}
a085ae5e	113	if (png_get_bit_depth(png_ptr, info_ptr) != 8)
13059a60	114	{
a085ae5e	115	lprintf(__FILE__ ": font image uses %ibpp, needed 8bpp\n", png_get_bit_depth(png_ptr, info_ptr));
13059a60	116	break;
	117	}
	118	for (y = 0; y < 16; y++)
	119	{
	120	for (x = 0; x < 16; x++)
	121	{
f6eaae4f	122	/* 16x16 grid of syms */
	123	int sym_w = req_w / 16;
	124	int sym_h = req_h / 16;
	125	for (y1 = 0; y1 < sym_h; y1++)
13059a60	126	{
f6eaae4f	127	unsigned char src = row_ptr[ysym_h + y1] + x*sym_w;
f6eaae4f	128	for (x1 = sym_w/2; x1 > 0; x1--, src+=2)
13059a60	129	*dst++ = ((src[0]^0xff) & 0xf0) \| ((src[1]^0xff) >> 4);
	130	}
	131	}
	132	}
	133	break;
	134	}
	135
	136	case READPNG_SELECTOR:
	137	{
	138	int x1, y1;
	139	unsigned char *dst = dest;
a085ae5e	140	if (png_get_image_width(png_ptr, info_ptr) != req_w \|\| png_get_image_height(png_ptr, info_ptr) != req_h)
13059a60	141	{
f6eaae4f	142	lprintf(__FILE__ ": unexpected selector image size %ix%i, needed %dx%d\n",
a085ae5e	143	(int)png_get_image_width(png_ptr, info_ptr), (int)png_get_image_height(png_ptr, info_ptr), req_w, req_h);
13059a60	144	break;
13059a60	145	}
a085ae5e	146	if (png_get_bit_depth(png_ptr, info_ptr) != 8)
13059a60	147	{
a085ae5e	148	lprintf(__FILE__ ": selector image uses %ibpp, needed 8bpp\n", png_get_bit_depth(png_ptr, info_ptr));
13059a60	149	break;
13059a60	150	}
f6eaae4f	151	for (y1 = 0; y1 < req_h; y1++)
13059a60	152	{
13059a60	153	unsigned char *src = row_ptr[y1];
f6eaae4f	154	for (x1 = req_w/2; x1 > 0; x1--, src+=2)
13059a60	155	*dst++ = ((src[0]^0xff) & 0xf0) \| ((src[1]^0xff) >> 4);
	156	}
	157	break;
	158	}
ff63afa1	159
f6eaae4f	160	case READPNG_24:
ff63afa1	161	{
ff63afa1	162	int height, width, h;
ff63afa1	163	unsigned char *dst = dest;
a085ae5e	164	if (png_get_bit_depth(png_ptr, info_ptr) != 8)
ff63afa1	165	{
a085ae5e	166	lprintf(__FILE__ ": image uses %ibpc, needed 8bpc\n", png_get_bit_depth(png_ptr, info_ptr));
ff63afa1	167	break;
ff63afa1	168	}
a085ae5e	169	width = png_get_image_width(png_ptr, info_ptr);
f6eaae4f	170	if (width > req_w)
f6eaae4f	171	width = req_w;
a085ae5e	172	height = png_get_image_height(png_ptr, info_ptr);
	173	if (height > req_h)
	174	height = req_h;
ff63afa1	175
	176	for (h = 0; h < height; h++)
	177	{
	178	int len = width;
	179	unsigned char *src = row_ptr[h];
f6eaae4f	180	dst += (req_w - width) * 3;
ff63afa1	181	for (len = width; len > 0; len--, dst+=3, src+=3)
	182	dst[0] = src[2], dst[1] = src[1], dst[2] = src[0];
	183	}
	184	break;
	185	}
13059a60	186	}
	187
	188
ff63afa1	189	ret = 0;
13059a60	190	done:
	191	png_destroy_read_struct(&png_ptr, info_ptr ? &info_ptr : NULL, (png_infopp)NULL);
	192	fclose(fp);
ff63afa1	193	return ret;
13059a60	194	}
13059a60	195
7fd8dbbb	196	int writepng(const char fname, unsigned short src, int w, int h)
	197	{
	198	png_structp png_ptr = NULL;
	199	png_infop info_ptr = NULL;
	200	png_bytepp row_pointers;
	201	int i, j, ret = -1;
	202	FILE *f;
	203
	204	f = fopen(fname, "wb");
	205	if (f == NULL) {
	206	lprintf(__FILE__ ": failed to open \"%s\"\n", fname);
	207	return -1;
	208	}
	209
	210	row_pointers = calloc(h, sizeof(row_pointers[0]));
	211	if (row_pointers == NULL)
	212	goto end1;
	213
	214	for (i = 0; i < h; i++) {
	215	unsigned char dst = malloc(w 3);
	216	if (dst == NULL)
	217	goto end2;
	218	row_pointers[i] = dst;
	219	for (j = 0; j < w; j++, src++, dst += 3) {
	220	dst[0] = (*src & 0xf800) >> 8;
	221	dst[1] = (*src & 0x07e0) >> 3;
	222	dst[2] = (*src & 0x001f) << 3;
	223	}
	224	}
	225
	226	/* initialize stuff */
	227	png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
	228	if (png_ptr == NULL) {
	229	fprintf(stderr, "png_create_write_struct() failed");
	230	goto end2;
	231	}
	232
	233	info_ptr = png_create_info_struct(png_ptr);
	234	if (info_ptr == NULL) {
	235	fprintf(stderr, "png_create_info_struct() failed");
	236	goto end3;
	237	}
	238
	239	if (setjmp(png_jmpbuf(png_ptr)) != 0) {
	240	fprintf(stderr, "error in png code\n");
	241	goto end4;
	242	}
	243
	244	png_init_io(png_ptr, f);
	245
	246	png_set_IHDR(png_ptr, info_ptr, w, h,
	247	8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE,
	248	PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
	249
	250	png_write_info(png_ptr, info_ptr);
	251	png_write_image(png_ptr, row_pointers);
	252	png_write_end(png_ptr, NULL);
	253
	254	ret = 0;
	255
	256	end4:
	257	// png_destroy_info_struct(png_ptr, &info_ptr); // freed below
	258	end3:
	259	png_destroy_write_struct(&png_ptr, &info_ptr);
260	end2:
261	for (i = 0; i < h; i++)
262	free(row_pointers[i]);
263	free(row_pointers);
264	end1:
265	fclose(f);
266	return ret;
267	}
13059a60	268