X-Git-Url: http://code.vuplus.com/gitweb/?p=vuplus_dvbapp;a=blobdiff_plain;f=lib%2Fgdi%2Fepng.cpp;h=fd33298f9ac4027cfd05678dd819cdf06a598a4f;hp=9c12bb10cb504161b2ce0f8287176941200996b3;hb=9d9d69d8242d27915c95cb794bd4e7a93759b6db;hpb=9841ba78bc18c8c9f91ad47702e9fae939a3dcbc

diff --git a/lib/gdi/epng.cpp b/lib/gdi/epng.cpp
index 9c12bb1..fd33298 100644
--- a/lib/gdi/epng.cpp
+++ b/lib/gdi/epng.cpp
@@ -1,8 +1,13 @@
+#define PNG_SKIP_SETJMP_CHECK
 #include <png.h>
 #include <stdio.h>
 #include <lib/gdi/epng.h>
 #include <unistd.h>
 
+extern "C" {
+#include <jpeglib.h>
+}
+
 int loadPNG(ePtr<gPixmap> &result, const char *filename)
 {
 	__u8 header[8];
@@ -66,9 +71,7 @@ int loadPNG(ePtr<gPixmap> &result, const char *filename)
 	
 	png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);
 	
-	eDebug("%s: %dx%dx%d png, %d", filename, (int)width, (int)height, (int)bit_depth, color_type);
-	
-	if (color_type != 6)
+	if (color_type == PNG_COLOR_TYPE_GRAY || color_type & PNG_COLOR_MASK_PALETTE)
 	{
 		result=new gPixmap(eSize(width, height), bit_depth);
 		gSurface *surface = result->surface;
@@ -113,16 +116,122 @@ int loadPNG(ePtr<gPixmap> &result, const char *filename)
 		}
 		surface->clut.start=0;
 		png_read_end(png_ptr, end_info);
-	} else
+	} else {
 		result=0;
+		eDebug("%s: %dx%dx%d png, %d", filename, (int)width, (int)height, (int)bit_depth, color_type);
+	}
 
 	png_destroy_read_struct(&png_ptr, &info_ptr,&end_info);
 	fclose(fp);
 	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)
 {
+
+	eDebug("\33[33m %s \33[0m",filename);
 	FILE *fp=fopen(filename, "wb");
 	if (!fp)
 		return -1;
@@ -148,6 +257,11 @@ int savePNG(const char *filename, gPixmap *pixmap)
 		unlink(filename);
 		return -3;
 	}
+
+	png_set_IHDR(png_ptr, info_ptr, surface->x, surface->y, surface->bpp/surface->bypp, 
+		PNG_COLOR_TYPE_RGB_ALPHA, 
+		PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+
 	if (setjmp(png_ptr->jmpbuf))
 	{
 		eDebug("error :/");
@@ -160,29 +274,35 @@ 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, 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 (surface->clut.data)
+	png_write_info(png_ptr, info_ptr);
+	png_set_packing(png_ptr);
+
+	png_byte *row_pointer;
+	png_byte *cr = new png_byte[surface->y * surface->stride];
+	if (cr == NULL)
+	{
+		printf("Error: malloc\n");
+		return -5;
+	}
+	for (int i=0; i<surface->y; ++i)
 	{
-		png_color palette[surface->clut.colors];
-		png_byte trans[surface->clut.colors];
-		for (int i=0; i<surface->clut.colors; ++i)
+		row_pointer=((png_byte*)surface->data)+i*surface->stride;
+		if (surface->bypp == 4)
 		{
-			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;
+			memcpy(cr, row_pointer, surface->stride);
+			for (int j=0; j<surface->stride; j+=4)
+			{
+				unsigned char tmp = cr[j];
+				cr[j] = cr[j+2];
+				cr[j+2]= tmp;
+			}
+			png_write_row(png_ptr, cr);
 		}
-		png_set_PLTE(png_ptr, info_ptr, palette, surface->clut.colors);
-		png_set_tRNS(png_ptr, info_ptr, trans, surface->clut.colors, 0);
+		else
+			png_write_row(png_ptr, row_pointer);
 	}
-	png_write_info(png_ptr, info_ptr);
-	png_set_packing(png_ptr);
-	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);
+	delete [] cr;
+
 	png_write_end(png_ptr, info_ptr);
 	png_destroy_write_struct(&png_ptr, &info_ptr);
 	fclose(fp);