X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?p=fceu.git;a=blobdiff_plain;f=drivers%2Fgp2x%2Freadpng.c;fp=drivers%2Fgp2x%2Freadpng.c;h=e6e127f2c7e75a6aad34258548d82e4c92dd818c;hp=0000000000000000000000000000000000000000;hb=47d0839eef773569f1093b47d795714cac0dacd2;hpb=6f6bc6fa47b2888c4420eeb323d96be0982150de

diff --git a/drivers/gp2x/readpng.c b/drivers/gp2x/readpng.c
new file mode 100644
index 0000000..e6e127f
--- /dev/null
+++ b/drivers/gp2x/readpng.c
@@ -0,0 +1,72 @@
+#include <stdio.h>
+#include <string.h>
+#include <png.h>
+
+void readpng(unsigned short *dest, const char *fname)
+{
+	FILE *fp;
+	png_structp png_ptr = NULL;
+	png_infop info_ptr = NULL;
+	png_bytepp row_ptr = NULL;
+	int height, width, h;
+
+	if (dest == NULL || fname == NULL)
+	{
+		return;
+	}
+
+	fp = fopen(fname, "rb");
+	if (fp == NULL)
+	{
+		printf(__FILE__ ": failed to open: %s\n", fname);
+		return;
+	}
+
+	png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+	if (!png_ptr)
+	{
+		printf(__FILE__ ": png_create_read_struct() failed\n");
+		fclose(fp);
+		return;
+	}
+
+	info_ptr = png_create_info_struct(png_ptr);
+	if (!info_ptr)
+	{
+		printf(__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)
+	{
+		printf(__FILE__ ": png_get_rows() failed\n");
+		goto done;
+	}
+
+	height = info_ptr->height;
+	if (height > 240) height = 240;
+	width = info_ptr->width;
+	if (width > 320) width = 320;
+
+	for (h = 0; h < height; h++)
+	{
+		unsigned char *src = row_ptr[h];
+		int len = width;
+		while (len--)
+		{
+			*dest++ = ((src[0]&0xf8)<<8) | ((src[1]&0xf8)<<3) | (src[2] >> 3);
+			src += 3;
+		}
+		dest += 320 - width;
+	}
+
+
+done:
+	png_destroy_read_struct(&png_ptr, info_ptr ? &info_ptr : NULL, (png_infopp)NULL);
+	fclose(fp);
+}
+