X-Git-Url: https://git.cweiske.de/enigma2.git/blobdiff_plain/d63d2c3c6cbbd574dda4f8b00ebe6c661735edd5..06578d6778bff8aa2bd6a2387651dd0ba55aa27c:/lib/gdi/epng.cpp

diff --git a/lib/gdi/epng.cpp b/lib/gdi/epng.cpp
index d476ec3a..6b08c2d8 100644
--- a/lib/gdi/epng.cpp
+++ b/lib/gdi/epng.cpp
@@ -3,13 +3,15 @@
 #include <lib/gdi/epng.h>
 #include <unistd.h>
 
-gImage *loadPNG(const char *filename)
+extern "C" {
+#include <jpeglib.h>
+}
+
+int loadPNG(ePtr<gPixmap> &result, const char *filename)
 {
 	__u8 header[8];
 	FILE *fp=fopen(filename, "rb");
 	
-	gImage *res=0;
-	
 	if (!fp)
 	{
 //		eDebug("couldn't open %s", filename );
@@ -54,8 +56,7 @@ gImage *loadPNG(const char *filename)
 		eDebug("das war wohl nix");
 		png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
 		fclose(fp);
-		if (res)
-			delete res;
+		result = 0;
 		return 0;
 	}
 	png_init_io(png_ptr, fp);
@@ -73,15 +74,16 @@ gImage *loadPNG(const char *filename)
 	
 	if (color_type != 6)
 	{
-		res=new gImage(eSize(width, height), bit_depth);
+		result=new gPixmap(eSize(width, height), bit_depth);
+		gSurface *surface = result->surface;
 	
 		png_bytep *rowptr=new png_bytep[height];
 	
 		for (unsigned int i=0; i<height; i++)
-			rowptr[i]=((png_byte*)(res->data))+i*res->stride;
+			rowptr[i]=((png_byte*)(surface->data))+i*surface->stride;
 		png_read_rows(png_ptr, rowptr, 0, height);
 	
-		delete rowptr;
+		delete [] rowptr;
 	
 		if (png_get_valid(png_ptr, info_ptr, PNG_INFO_PLTE))
 		{
@@ -89,37 +91,140 @@ gImage *loadPNG(const char *filename)
 			int num_palette;
 			png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette);
 			if (num_palette)
-				res->clut.data=new gRGB[num_palette];
+				surface->clut.data=new gRGB[num_palette];
 			else
-				res->clut.data=0;
-			res->clut.colors=num_palette;
+				surface->clut.data=0;
+			surface->clut.colors=num_palette;
 			
 			for (int i=0; i<num_palette; i++)
 			{
-				res->clut.data[i].a=0;
-				res->clut.data[i].r=palette[i].red;
-				res->clut.data[i].g=palette[i].green;
-				res->clut.data[i].b=palette[i].blue;
+				surface->clut.data[i].a=0;
+				surface->clut.data[i].r=palette[i].red;
+				surface->clut.data[i].g=palette[i].green;
+				surface->clut.data[i].b=palette[i].blue;
 			}
 			if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
 			{
 				png_byte *trans;
 				png_get_tRNS(png_ptr, info_ptr, &trans, &num_palette, 0);
 				for (int i=0; i<num_palette; i++)
-					res->clut.data[i].a=255-trans[i];
+					surface->clut.data[i].a=255-trans[i];
 			}
 		} else
 		{
-			res->clut.data=0;
-			res->clut.colors=0;
+			surface->clut.data=0;
+			surface->clut.colors=0;
 		}
+		surface->clut.start=0;
 		png_read_end(png_ptr, end_info);
 	} else
-		res=0;
+		result=0;
 
 	png_destroy_read_struct(&png_ptr, &info_ptr,&end_info);
 	fclose(fp);
-	return res;
+	return 0;
+}
+
+struct my_error_mgr {
+	struct jpeg_error_mgr pub;
+	jmp_buf setjmp_buffer;
+};
+
+typedef struct my_error_mgr * my_error_ptr;
+
+static void
+my_error_exit (j_common_ptr cinfo)
+{
+	my_error_ptr myerr = (my_error_ptr) cinfo->err;
+	(*cinfo->err->output_message) (cinfo);
+	longjmp(myerr->setjmp_buffer, 1);
+}
+
+int loadJPG(ePtr<gPixmap> &result, const char *filename, ePtr<gPixmap> alpha)
+{
+	struct jpeg_decompress_struct cinfo;
+	struct my_error_mgr jerr;
+	FILE *infile;
+	JSAMPARRAY buffer;
+	int row_stride;
+	infile = fopen(filename, "rb");
+	result = 0;
+
+	if (alpha)
+	{
+		if (alpha->surface->bpp != 8)
+		{
+			eWarning("alpha channel for jpg must be 8bit");
+			alpha = 0;
+		}
+	}
+
+	if (!infile)
+		return -1;
+	cinfo.err = jpeg_std_error(&jerr.pub);
+	jerr.pub.error_exit = my_error_exit;
+	if (setjmp(jerr.setjmp_buffer)) {
+		result = 0;
+		jpeg_destroy_decompress(&cinfo);
+		fclose(infile);
+		return -1;
+	}
+	jpeg_create_decompress(&cinfo);
+	jpeg_stdio_src(&cinfo, infile);
+	(void) jpeg_read_header(&cinfo, TRUE);
+	cinfo.out_color_space = JCS_RGB;
+	cinfo.scale_denom = 1;
+
+	(void) jpeg_start_decompress(&cinfo);
+
+	int grayscale = cinfo.output_components == 1;
+
+	if (alpha)
+	{
+		if (((int)cinfo.output_width != alpha->surface->x) || ((int)cinfo.output_height != alpha->surface->y))
+		{
+			eWarning("alpha channel size (%dx%d) must match jpeg size (%dx%d)", alpha->surface->x, alpha->surface->y, cinfo.output_width, cinfo.output_height);
+			alpha = 0;
+		}
+		if (grayscale)
+		{
+			eWarning("we don't support grayscale + alpha at the moment");
+			alpha = 0;
+		}
+	}
+
+	result = new gPixmap(eSize(cinfo.output_width, cinfo.output_height), grayscale ? 8 : 32);
+
+	row_stride = cinfo.output_width * cinfo.output_components;
+	buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
+	while (cinfo.output_scanline < cinfo.output_height) {
+		int y = cinfo.output_scanline;
+		(void) jpeg_read_scanlines(&cinfo, buffer, 1);
+		unsigned char *dst = ((unsigned char*)result->surface->data) + result->surface->stride * y;
+		unsigned char *src = (unsigned char*)buffer[0];
+		unsigned char *palpha = alpha ? ((unsigned char*)alpha->surface->data + alpha->surface->stride * y) : 0;
+		if (grayscale)
+			memcpy(dst, src, cinfo.output_width);
+		else
+		{
+			int x;
+			for (x = 0; x < (int)cinfo.output_width; ++x)
+			{
+				*dst++ = src[2];
+				*dst++ = src[1];
+				*dst++ = src[0];
+				src += 3;
+				if (palpha)
+					*dst++ = *palpha++;
+				else 
+					*dst++ = 0xFF;
+			}
+		}
+	}
+	(void) jpeg_finish_decompress(&cinfo);
+	jpeg_destroy_decompress(&cinfo);
+	fclose(infile);
+	return 0;
 }
 
 int savePNG(const char *filename, gPixmap *pixmap)
@@ -127,6 +232,11 @@ int savePNG(const char *filename, gPixmap *pixmap)
 	FILE *fp=fopen(filename, "wb");
 	if (!fp)
 		return -1;
+	
+	gSurface *surface = pixmap->surface;
+	if (!surface)
+		return -2;
+	
 	png_structp png_ptr=png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
 	if (!png_ptr)
 	{
@@ -156,28 +266,28 @@ int savePNG(const char *filename, gPixmap *pixmap)
 	png_set_filter(png_ptr, 0, PNG_FILTER_NONE|PNG_FILTER_SUB|PNG_FILTER_PAETH);
 	png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
 
-	png_set_IHDR(png_ptr, info_ptr, pixmap->x, pixmap->y, pixmap->bpp, 
-		pixmap->clut.data ? PNG_COLOR_TYPE_PALETTE : PNG_COLOR_TYPE_GRAY, 
+	png_set_IHDR(png_ptr, info_ptr, surface->x, surface->y, surface->bpp, 
+		surface->clut.data ? PNG_COLOR_TYPE_PALETTE : PNG_COLOR_TYPE_GRAY, 
 		PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
-	if (pixmap->clut.data)
+	if (surface->clut.data)
 	{
-		png_color palette[pixmap->clut.colors];
-		png_byte trans[pixmap->clut.colors];
-		for (int i=0; i<pixmap->clut.colors; ++i)
+		png_color palette[surface->clut.colors];
+		png_byte trans[surface->clut.colors];
+		for (int i=0; i<surface->clut.colors; ++i)
 		{
-			palette[i].red=pixmap->clut.data[i].r;
-			palette[i].green=pixmap->clut.data[i].g;
-			palette[i].blue=pixmap->clut.data[i].b;
-			trans[i]=255-pixmap->clut.data[i].a;
+			palette[i].red=surface->clut.data[i].r;
+			palette[i].green=surface->clut.data[i].g;
+			palette[i].blue=surface->clut.data[i].b;
+			trans[i]=255-surface->clut.data[i].a;
 		}
-		png_set_PLTE(png_ptr, info_ptr, palette, pixmap->clut.colors);
-		png_set_tRNS(png_ptr, info_ptr, trans, pixmap->clut.colors, 0);
+		png_set_PLTE(png_ptr, info_ptr, palette, surface->clut.colors);
+		png_set_tRNS(png_ptr, info_ptr, trans, surface->clut.colors, 0);
 	}
 	png_write_info(png_ptr, info_ptr);
 	png_set_packing(png_ptr);
-	png_byte *row_pointers[pixmap->y];
-	for (int i=0; i<pixmap->y; ++i)
-		row_pointers[i]=((png_byte*)pixmap->data)+i*pixmap->stride;
+	png_byte *row_pointers[surface->y];
+	for (int i=0; i<surface->y; ++i)
+		row_pointers[i]=((png_byte*)surface->data)+i*surface->stride;
 	png_write_image(png_ptr, row_pointers);
 	png_write_end(png_ptr, info_ptr);
 	png_destroy_write_struct(&png_ptr, &info_ptr);