X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=frontend%2Fcommon%2Freadpng.c;fp=frontend%2Fcommon%2Freadpng.c;h=b7bad572faf905b146fefa46917dd7a5b6363f82;hb=698517be481301b4525c29873134a67b8343af3c;hp=0000000000000000000000000000000000000000;hpb=1972732abfea710d3d7b61180971580d9e5081ce;p=pcsx_rearmed.git

diff --git a/frontend/common/readpng.c b/frontend/common/readpng.c
new file mode 100644
index 00000000..b7bad572
--- /dev/null
+++ b/frontend/common/readpng.c
@@ -0,0 +1,193 @@
+/*
+ * (C) Gražvydas "notaz" Ignotas, 2008-2010
+ *
+ * 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.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include <stdio.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)info_ptr->width, (int)info_ptr->height, info_ptr->pixel_depth);
+
+	switch (what)
+	{
+		case READPNG_BG:
+		{
+			int height, width, h;
+			unsigned short *dst = dest;
+			if (info_ptr->pixel_depth != 24)
+			{
+				lprintf(__FILE__ ": bg image uses %ibpp, needed 24bpp\n", info_ptr->pixel_depth);
+				break;
+			}
+			height = info_ptr->height;
+			if (height > req_h)
+				height = req_h;
+			width = info_ptr->width;
+			if (width > req_w)
+				width = req_w;
+
+			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 (info_ptr->width != req_w || info_ptr->height != req_h)
+			{
+				lprintf(__FILE__ ": unexpected font image size %dx%d, needed %dx%d\n",
+					(int)info_ptr->width, (int)info_ptr->height, req_w, req_h);
+				break;
+			}
+			if (info_ptr->pixel_depth != 8)
+			{
+				lprintf(__FILE__ ": font image uses %ibpp, needed 8bpp\n", info_ptr->pixel_depth);
+				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 (info_ptr->width != req_w || info_ptr->height != req_h)
+			{
+				lprintf(__FILE__ ": unexpected selector image size %ix%i, needed %dx%d\n",
+					(int)info_ptr->width, (int)info_ptr->height, req_w, req_h);
+				break;
+			}
+			if (info_ptr->pixel_depth != 8)
+			{
+				lprintf(__FILE__ ": selector image uses %ibpp, needed 8bpp\n", info_ptr->pixel_depth);
+				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 (info_ptr->pixel_depth != 24)
+			{
+				lprintf(__FILE__ ": image uses %ibpp, needed 24bpp\n", info_ptr->pixel_depth);
+				break;
+			}
+			height = info_ptr->height;
+			if (height > req_h)
+				height = req_h;
+			width = info_ptr->width;
+			if (width > req_w)
+				width = req_w;
+
+			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;
+}
+
+