Initial revision

CHANGES

@@ -0,0 +1,41 @@
+
+1.0.9:
+Mattias Engdeg�rd - Sat Jul  1 17:57:37 PDT 2000
+ * PNG loader properly sets the colorkey on 8-bit transparent images
+Mattias Engdeg�rd - Sat Jul  1 13:24:47 PDT 2000
+ * Fixed a bug in PCX detection
+ * Added support for TGA files
+ * showimage shows a checker background for transparent images
+
+1.0.8:
+Mark Baker - Tue May 30 12:20:00 PDT 2000
+ * Added TIFF format loading support
+
+1.0.7:
+Mattias Engdeg�rd - Sat May 27 14:18:33 PDT 2000
+ * Added fixes for loading images on big-endian systems
+
+1.0.6:
+Sam Lantinga - Sat Apr 29 10:18:32 PDT 2000
+ * showimage puts the name of the image in the title bar caption
+Sam Lantinga - Sat Apr 29 10:05:58 PDT 2000
+ * Removed pitch check, since PNG already loads to a list of row pointers
+
+1.0.5:
+Sam Lantinga - Sun Apr 23 14:41:32 PDT 2000
+ * Added support for GIF transparency
+Sam Lantinga - Wed Apr 12 14:39:20 PDT 2000
+ * Fixed memory heap crash on NT using PNG images
+Matt Campbell - Thu, 13 Apr 2000 13:29:17 -0700
+ * Fixed PNG detection on some Linux systems
+
+1.0.4:
+Sam Lantinga - Tue Feb  1 13:33:53 PST 2000
+ * Cleaned up for Visual C++
+ * Added Visual C++ project file
+
+1.0.3:
+Sam Lantinga - Wed Jan 19 22:10:52 PST 2000
+ * Added CHANGES
+ * Added rpm spec file contributed by Hakan Tandogan
+ * Changed the name of the example program from "show" to "showimage"

IMG.c

@@ -0,0 +1,145 @@
+/*
+    IMGLIB:  An example image loading library for use with SDL
+    Copyright (C) 1999  Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Sam Lantinga
+    5635-34 Springhouse Dr.
+    Pleasanton, CA 94588 (USA)
+    [email protected]
+*/
+
+/* A simple library to load images of various formats as SDL surfaces */
+
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+
+#include "SDL_image.h"
+
+/* Table of image detection and loading functions */
+static struct {
+	char *type;
+	int (*is)(SDL_RWops *src);
+	SDL_Surface *(*load)(SDL_RWops *src);
+} supported[] = {
+        /* keep magicless formats first (denoted by is==NULL) */
+	{ "TGA", NULL,      IMG_LoadTGA_RW },
+	{ "BMP", IMG_isBMP, IMG_LoadBMP_RW },
+	{ "PPM", IMG_isPPM, IMG_LoadPPM_RW },
+	{ "PCX", IMG_isPCX, IMG_LoadPCX_RW },
+	{ "GIF", IMG_isGIF, IMG_LoadGIF_RW },
+	{ "JPG", IMG_isJPG, IMG_LoadJPG_RW },
+	{ "TIF", IMG_isTIF, IMG_LoadTIF_RW },
+	{ "PNG", IMG_isPNG, IMG_LoadPNG_RW },
+};
+
+/* Does the alpha value correspond to transparency or opacity?
+   Default: transparency
+*/
+int IMG_invert_alpha = 0;
+
+/* Load an image from a file */
+SDL_Surface *IMG_Load(const char *file)
+{
+    SDL_RWops *src = SDL_RWFromFile(file, "rb");
+    char *ext = strrchr(file, '.');
+    if(ext)
+	ext++;
+    return IMG_LoadTyped_RW(src, 1, ext);
+}
+
+/* Load an image from an SDL datasource (for compatibility) */
+SDL_Surface *IMG_Load_RW(SDL_RWops *src, int freesrc)
+{
+    return IMG_LoadTyped_RW(src, freesrc, NULL);
+}
+
+/* Portable case-insensitive string compare function */
+static int string_equals(const char *str1, const char *str2)
+{
+	while ( *str1 && *str2 ) {
+		if ( toupper((unsigned char)*str1) !=
+		     toupper((unsigned char)*str2) )
+			break;
+		++str1;
+		++str2;
+	}
+	return (!*str1 && !*str2);
+}
+
+/* Load an image from an SDL datasource, optionally specifying the type */
+SDL_Surface *IMG_LoadTyped_RW(SDL_RWops *src, int freesrc, char *type)
+{
+	int i, start;
+	SDL_Surface *image;
+
+	/* Make sure there is something to do.. */
+	if ( src == NULL ) {
+		return(NULL);
+	}
+
+	/* See whether or not this data source can handle seeking */
+	if ( SDL_RWseek(src, 0, SEEK_CUR) < 0 ) {
+		IMG_SetError("Can't seek in this data source");
+		return(NULL);
+	}
+
+	/* Detect the type of image being loaded */
+	start = SDL_RWtell(src);
+	image = NULL;
+	for ( i=0; supported[i].type && !image; ++i ) {
+	        if( (supported[i].is
+		     && (SDL_RWseek(src, start, SEEK_SET),
+			 supported[i].is(src)))
+		    || (type && string_equals(type, supported[i].type))) {
+#ifdef DEBUG_IMGLIB
+			fprintf(stderr, "IMGLIB: Loading image as %s\n",
+							supported[i].type);
+#endif
+			SDL_RWseek(src, start, SEEK_SET);
+			image = supported[i].load(src);
+			break;
+		}
+	}
+
+	/* Clean up, check for errors, and return */
+	if ( freesrc ) {
+		SDL_RWclose(src);
+	}
+	if ( image == NULL ) {
+		IMG_SetError("Unsupported image format");
+	}
+	return(image);
+}
+
+/* Invert the alpha of a surface for use with OpenGL
+   If you want to use a surface loaded with this library as an OpenGL texture,
+   set invart_alpha to 1.  If you want to use it with SDL alpha blit routines,
+   set it to 0.
+   This function returns the old alpha inversion value.
+
+   Currently this is is only used by the PNG and TGA loaders.
+ */
+int IMG_InvertAlpha(int on)
+{
+	int old_alpha_value;
+
+	old_alpha_value = IMG_invert_alpha;
+	IMG_invert_alpha = on;
+	return(old_alpha_value);
+}
+

IMG_bmp.c

@@ -0,0 +1,69 @@
+/*
+    IMGLIB:  An example image loading library for use with SDL
+    Copyright (C) 1999  Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library 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
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public
+    License along with this library; if not, write to the Free
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+    Sam Lantinga
+    5635-34 Springhouse Dr.
+    Pleasanton, CA 94588 (USA)
+    [email protected]
+*/
+
+/* This is a BMP image file loading framework */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "SDL_image.h"
+
+#ifdef LOAD_BMP
+
+/* See if an image is contained in a data source */
+int IMG_isBMP(SDL_RWops *src)
+{
+	int is_BMP;
+	char magic[2];
+
+	is_BMP = 0;
+	if ( SDL_RWread(src, magic, 2, 1) ) {
+		if ( strncmp(magic, "BM", 2) == 0 ) {
+			is_BMP = 1;
+		}
+	}
+	return(is_BMP);
+}
+
+/* Load a BMP type image from an SDL datasource */
+SDL_Surface *IMG_LoadBMP_RW(SDL_RWops *src)
+{
+	return(SDL_LoadBMP_RW(src, 0));
+}
+
+#else
+
+/* See if an image is contained in a data source */
+int IMG_isBMP(SDL_RWops *src)
+{
+	return(0);
+}
+
+/* Load a BMP type image from an SDL datasource */
+SDL_Surface *IMG_LoadBMP_RW(SDL_RWops *src)
+{
+	return(NULL);
+}
+
+#endif /* LOAD_BMP */