- Add JPEG support

- Refactor call to LoadTGA so it returns image_t * directly

Makefile

@@ -41,6 +41,13 @@ CC := gcc
 
 # ----------
 
+# Options
+
+# Enables .jpg texture support 
+JPEG := 1
+
+# ----------
+
 # Base CFLAGS. 
 #
 # -O2 are enough optimizations.
@@ -169,6 +176,11 @@ build/refresher/%.o: %.c
 
 release/ref_gl.so : CFLAGS += -fPIC
 release/ref_gl.so : LDFLAGS += -shared
+
+ifdef JPEG
+release/ref_gl.so : CFLAGS += -DWITH_JPEG
+release/ref_gl.so : LDFLAGS += -ljpeg
+endif
 	
 # ----------
 
@@ -376,6 +388,7 @@ OPENGL_OBJS_ = \
 	src/refresh/files/pcx.o \
 	src/refresh/files/sp2.o \
 	src/refresh/files/tga.o \
+	src/refresh/files/jpeg.o \
 	src/refresh/files/wal.o \
 	src/sdl/input.o \
 	src/sdl/refresh.o \

src/refresh/files/jpeg.c

@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 1997-2001 Id Software, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ *
+ * =======================================================================
+ *
+ * The JPEG image format
+ *
+ * =======================================================================
+ */
+
+#ifdef WITH_JPEG
+
+#include "../header/local.h"
+#include <jpeglib.h>
+
+/*
+=================================================================
+
+JPEG LOADING
+NiceAss: Code from Q2Ice
+
+=================================================================
+*/
+
+void jpg_null(j_decompress_ptr cinfo)
+{
+}
+
+boolean jpg_fill_input_buffer(j_decompress_ptr cinfo)
+{
+    ri.Con_Printf(PRINT_ALL, "Premature end of JPEG data\n");
+    return 1;
+}
+
+void jpg_skip_input_data(j_decompress_ptr cinfo, long num_bytes)
+{
+
+    cinfo->src->next_input_byte += (size_t) num_bytes;
+    cinfo->src->bytes_in_buffer -= (size_t) num_bytes;
+}
+
+void jpeg_mem_src (j_decompress_ptr cinfo, byte *mem, int len)
+{
+    cinfo->src = (struct jpeg_source_mgr *)(*cinfo->mem->alloc_small)((j_common_ptr) cinfo, JPOOL_PERMANENT, sizeof(struct jpeg_source_mgr));
+    cinfo->src->init_source = jpg_null;
+    cinfo->src->fill_input_buffer = jpg_fill_input_buffer;
+    cinfo->src->skip_input_data = jpg_skip_input_data;
+    cinfo->src->resync_to_restart = jpeg_resync_to_restart;
+    cinfo->src->term_source = jpg_null;
+    cinfo->src->bytes_in_buffer = len;
+    cinfo->src->next_input_byte = mem;
+}
+
+/*
+==============
+LoadJPG
+==============
+*/
+image_t *
+LoadJPG (char *filename, int *width, int *height, imagetype_t type)
+{
+	byte *pic = NULL;
+	struct jpeg_decompress_struct	cinfo;
+	struct jpeg_error_mgr			jerr;
+	byte							*rawdata, *rgbadata, *scanline, *p, *q;
+	unsigned int					rawsize, i;
+
+	// Load JPEG file into memory
+	rawsize = ri.FS_LoadFile(filename, (void **)&rawdata);
+
+	if (!rawdata)
+		return NULL;
+
+	if (rawsize < 10 || rawdata[6] != 'J' || rawdata[7] != 'F' || rawdata[8] != 'I' || rawdata[9] != 'F')
+	{
+		ri.Con_Printf (PRINT_ALL, "Invalid JPEG header: %s\n", filename);
+		ri.FS_FreeFile(rawdata);
+		return NULL;
+	}
+
+	cinfo.err = jpeg_std_error(&jerr);
+	jpeg_create_decompress(&cinfo);
+	jpeg_mem_src(&cinfo, rawdata, rawsize);
+	jpeg_read_header(&cinfo, true);
+	jpeg_start_decompress(&cinfo);
+
+	if(cinfo.output_components != 3 && cinfo.output_components != 4)
+	{
+		ri.Con_Printf(PRINT_ALL, "Invalid JPEG colour components\n");
+		jpeg_destroy_decompress(&cinfo);
+		ri.FS_FreeFile(rawdata);
+		return NULL;
+	}
+
+	// Allocate Memory for decompressed image
+	rgbadata = malloc(cinfo.output_width * cinfo.output_height * 4);
+	if(!rgbadata)
+	{
+		ri.Con_Printf(PRINT_ALL, "Insufficient memory for JPEG buffer\n");
+		jpeg_destroy_decompress(&cinfo);
+		ri.FS_FreeFile(rawdata);
+		return NULL;
+	}
+
+	// Pass sizes to output
+	*width = cinfo.output_width;
+	*height = cinfo.output_height;
+
+	// Allocate Scanline buffer
+	scanline = malloc (cinfo.output_width * 3);
+	if (!scanline)
+	{
+		ri.Con_Printf (PRINT_ALL, "Insufficient memory for JPEG scanline buffer\n");
+		free (rgbadata);
+		jpeg_destroy_decompress (&cinfo);
+		ri.FS_FreeFile (rawdata);
+		return NULL;
+	}
+
+	// Read Scanlines, and expand from RGB to RGBA
+	q = rgbadata;
+	while (cinfo.output_scanline < cinfo.output_height)
+	{
+		p = scanline;
+		jpeg_read_scanlines(&cinfo, &scanline, 1);
+
+		for (i = 0; i < cinfo.output_width; i++)
+		{
+			q[0] = p[0];
+			q[1] = p[1];
+			q[2] = p[2];
+			q[3] = 255;
+			p += 3;
+			q += 4;
+		}
+	}
+
+	free (scanline);
+	jpeg_finish_decompress (&cinfo);
+	jpeg_destroy_decompress (&cinfo);
+
+	pic = rgbadata;
+
+	if ( !pic )
+	{
+		return ( NULL );
+	}
+
+	return R_LoadPic( filename, pic, *width, *height, type, 32 );
+}
+
+#endif // WITH_JPEG

src/refresh/files/tga.c

@@ -35,9 +35,10 @@ typedef struct _TargaHeader
 	unsigned char pixel_size, attributes;
 } TargaHeader;
 
-void
+image_t *
-LoadTGA ( char *name, byte **pic, int *width, int *height )
+LoadTGA ( char *name, int *width, int *height, imagetype_t type )
 {
+	byte *pic = NULL;
 	int columns, rows, numPixels;
 	byte    *pixbuf;
 	int row, column;
@@ -48,15 +49,13 @@ LoadTGA ( char *name, byte **pic, int *width, int *height )
 	byte            *targa_rgba;
 	byte tmp [ 2 ];
 
-	*pic = NULL;
-
 	/* load the file */
 	length = ri.FS_LoadFile( name, (void **) &buffer );
 
 	if ( !buffer )
 	{
 		ri.Con_Printf( PRINT_DEVELOPER, "Bad tga file %s\n", name );
-		return;
+		return NULL;
 	}
 
 	buf_p = buffer;
@@ -112,7 +111,7 @@ LoadTGA ( char *name, byte **pic, int *width, int *height )
 	}
 
 	targa_rgba = malloc( numPixels * 4 );
-	*pic = targa_rgba;
+	pic = targa_rgba;
 
 	if ( targa_header.id_length != 0 )
 	{
@@ -271,5 +270,12 @@ LoadTGA ( char *name, byte **pic, int *width, int *height )
 	}
 
 	ri.FS_FreeFile( buffer );
+
+	if ( !pic )
+	{
+		return ( NULL );
+	}
+
+	return R_LoadPic( name, pic, *width, *height, type, 32 );
 }  
 

src/refresh/r_image.c

@@ -52,7 +52,10 @@ int gl_filter_min = GL_LINEAR_MIPMAP_NEAREST;
 int gl_filter_max = GL_LINEAR;
 
 image_t *LoadWal ( char *name );
-void LoadTGA ( char *name, byte **pic, int *width, int *height );
+image_t *LoadTGA ( char *name, int *width, int *height, imagetype_t type );
+#ifdef WITH_JPEG
+ image_t *LoadJPG (char *filename, int *width, int *height, imagetype_t type);
+#endif
 int Draw_GetPalette ( void );
 
 typedef struct
@@ -1066,14 +1069,11 @@ R_FindImage ( char *name, imagetype_t type )
 	}
 	else if ( !strcmp( name + len - 4, ".tga" ) )
 	{
-		LoadTGA( name, &pic, &width, &height );
+		return LoadTGA( name, &width, &height, type );
-
+	}
-		if ( !pic )
+	else if ( !strcmp( name + len - 4, ".jpg" ) )
-		{
+	{
-			return ( NULL );
+		return LoadJPG( name, &width, &height, type );
-		}
-
-		image = R_LoadPic( name, pic, width, height, type, 32 );
 	}
 	else
 	{