Added missing dependicies

libs/sfillib/libsfil/source/sfil_png.c

@@ -0,0 +1,139 @@
+#include "sfil.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <png.h>
+
+#define PNG_SIGSIZE (8)
+
+static void _sfil_read_png_file_fn(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+	FILE *fp = (FILE *)png_get_io_ptr(png_ptr);
+	fread(data, 1, length, fp);
+}
+
+static void _sfil_read_png_buffer_fn(png_structp png_ptr, png_bytep data, png_size_t length)
+{
+	unsigned int *address = png_get_io_ptr(png_ptr);
+	memcpy(data, (void *)*address, length);
+	*address += length;
+}
+
+static sf2d_texture *_sfil_load_PNG_generic(const void *io_ptr, png_rw_ptr read_data_fn, sf2d_place place)
+{
+	png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+	if (png_ptr == NULL) {
+		goto exit_error;
+	}
+
+	png_infop info_ptr = png_create_info_struct(png_ptr);
+	if (info_ptr == NULL) {
+		goto exit_destroy_read;
+	}
+
+	png_bytep *row_ptrs = NULL;
+
+	if (setjmp(png_jmpbuf(png_ptr))) {
+		png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)0);
+		if (row_ptrs != NULL)
+			free(row_ptrs);
+		goto exit_error;
+	}
+
+	png_set_read_fn(png_ptr, (png_voidp)io_ptr, read_data_fn);
+	png_set_sig_bytes(png_ptr, PNG_SIGSIZE);
+	png_read_info(png_ptr, info_ptr);
+
+	unsigned int width, height;
+	int bit_depth, color_type;
+
+	png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth,
+		&color_type, NULL, NULL, NULL);
+
+	if ((color_type == PNG_COLOR_TYPE_PALETTE && bit_depth <= 8)
+		|| (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
+		|| png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)
+		|| (bit_depth == 16)) {
+			png_set_expand(png_ptr);
+	}
+
+	if (bit_depth == 8 && color_type == PNG_COLOR_TYPE_RGB)
+		png_set_filler(png_ptr, 0xFF, PNG_FILLER_AFTER);
+
+	if (color_type == PNG_COLOR_TYPE_PALETTE) {
+		png_set_palette_to_rgb(png_ptr);
+		png_set_filler(png_ptr, 0xFF, PNG_FILLER_AFTER);
+	}
+
+	if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
+		png_set_expand_gray_1_2_4_to_8(png_ptr);
+
+	if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
+		png_set_tRNS_to_alpha(png_ptr);
+
+	if (bit_depth < 8)
+		png_set_packing(png_ptr);
+
+	png_read_update_info(png_ptr, info_ptr);
+
+	row_ptrs = (png_bytep *)malloc(sizeof(png_bytep) * height);
+	sf2d_texture *texture = sf2d_create_texture(width, height, GPU_RGBA8, place);
+
+	int stride = texture->pow2_w * 4;
+	int i;
+	for (i = 0; i < height; i++) {
+		row_ptrs[i] = (png_bytep)(texture->data + i*stride);
+	}
+
+	png_read_image(png_ptr, row_ptrs);
+
+	png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)0);
+	free(row_ptrs);
+
+	sf2d_texture_tile32(texture);
+	return texture;
+
+exit_destroy_read:
+	png_destroy_read_struct(&png_ptr, (png_infopp)0, (png_infopp)0);
+exit_error:
+	return NULL;
+}
+
+
+sf2d_texture *sfil_load_PNG_file(const char *filename, sf2d_place place)
+{
+	png_byte pngsig[PNG_SIGSIZE];
+	FILE *fp;
+
+	if ((fp = fopen(filename, "rb")) == NULL) {
+		goto exit_error;
+	}
+
+	if (fread(pngsig, 1, PNG_SIGSIZE, fp) != PNG_SIGSIZE) {
+		goto exit_close;
+	}
+
+	if (png_sig_cmp(pngsig, 0, PNG_SIGSIZE) != 0) {
+		goto exit_close;
+	}
+
+	sf2d_texture *texture = _sfil_load_PNG_generic((void *)fp, _sfil_read_png_file_fn, place);
+	fclose(fp);
+	return texture;
+
+exit_close:
+	fclose(fp);
+exit_error:
+	return NULL;
+}
+
+sf2d_texture *sfil_load_PNG_buffer(const void *buffer, sf2d_place place)
+{
+	if (png_sig_cmp((png_byte *) buffer, 0, PNG_SIGSIZE) != 0) {
+		return NULL;
+	}
+
+	unsigned int buffer_address = (unsigned int)buffer + PNG_SIGSIZE;
+
+	return _sfil_load_PNG_generic((void *)&buffer_address, _sfil_read_png_buffer_fn, place);
+}