Implement hooks for image decoding into MojoSetup.

icculus · Nov 24, 2007 · 9e78831 · 9e78831
1 parent b66b92d
commit 9e78831
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diff --git a/mojosetup.c b/mojosetup.c
@@ -583,6 +583,34 @@ void bz_internal_error(int errcode)
 #endif
 
 
+#if SUPPORT_STBIMAGE
+unsigned char *stbi_load_from_memory(unsigned char *buffer, int len, int *x,
+                                     int *y, int *comp, int req_comp);
+#endif
+
+uint8 *decodeImage(const uint8 *data, uint32 size, uint32 *w, uint32 *h)
+{
+    uint8 *retval = MojoPlatform_decodeImage(data, size, w, h);
+
+    #if SUPPORT_STBIMAGE
+    if (retval == NULL)  // try our built-in routines.
+    {
+        const int siz = (int) size;
+        unsigned char *buf = (unsigned char *) data;
+        int x = 0, y = 0, comp = 0;
+        retval = (uint8 *) stbi_load_from_memory(buf, siz, &x, &y, &comp, 4);
+        *w = (uint32) x;
+        *h = (uint32) y;
+    } // if
+    #endif
+
+    if (retval == NULL)
+        *w = *h = 0;
+
+    return retval;
+} // decodeImage
+
+
 // This is called from main()/WinMain()/whatever.
 int MojoSetup_main(int argc, char **argv)
 {

diff --git a/platform.h b/platform.h
@@ -239,6 +239,20 @@ void MojoPlatform_sleep(uint32 ticks);
 //  characters. You should supply if needed.
 void MojoPlatform_log(const char *str);
 
+// This tries to decode a graphic file in memory into an RGBA framebuffer.
+//  Most platforms return NULL here. No one should call this; use decodeImage()
+//  instead, which will try included platform-independent code if this fails.
+// This function is just here to allow a platform with the appropriate
+//  functionality to work without compiling in stb_image.c, or supply more
+//  formats over the built-in code.
+// (data) points to the compressed data, (size) is the number of bytes
+//  of compressed data. (*w) and (*h) will contain the images dimensions on
+//  return.
+// Returns NULL on failure (unsupported, etc) and a pointer to the
+//  uncompressed data on success. Caller must free() the returned pointer!
+uint8 *MojoPlatform_decodeImage(const uint8 *data, uint32 size,
+                                uint32 *w, uint32 *h);
+
 // Get the current locale, in the format "xx_YY" where "xx" is the language
 //  (en, fr, de...) and "_YY" is the country. (_US, _CA, etc). The country
 //  can be omitted. Don't include encoding, it's always UTF-8 at this time.

diff --git a/platform_unix.c b/platform_unix.c
@@ -1017,6 +1017,14 @@ void MojoPlatform_spawnTerminal(void)
 } // MojoPlatform_spawnTerminal
 
 
+uint8 *MojoPlatform_decodeImage(const uint8 *data, uint32 size,
+                                uint32 *w, uint32 *h)
+{
+    // !!! FIXME: try Quartz APIs on Mac OS X?
+    return NULL; // no platform-specific APIs. Just use the built-in ones.
+} // MojoPlatform_decodeImage
+
+
 static void signal_catcher(int sig)
 {
     static boolean first_shot = true;

diff --git a/platform_windows.c b/platform_windows.c
@@ -641,6 +641,13 @@ void MojoPlatform_spawnTerminal(void)
 } // MojoPlatform_spawnTerminal
 
 
+uint8 *MojoPlatform_decodeImage(const uint8 *data, uint32 size,
+                                uint32 *w, uint32 *h)
+{
+    return NULL;  // !!! FIXME: try IPicture?
+} // MojoPlatform_decodeImage
+
+
 char *MojoPlatform_currentWorkingDir(void)
 {
     char *retval = NULL;

diff --git a/universal.h b/universal.h
@@ -192,6 +192,15 @@ const char *translate(const char *str);
 //   profile("Something I did", start);
 uint32 profile(const char *what, uint32 start_time);
 
+// This tries to decode a graphic file in memory into an RGBA framebuffer,
+//  first with platform-specific facilities, if any, and then any built-in
+//  decoders, if that fails.
+// (data) points to the compressed data, (size) is the number of bytes
+//  of compressed data. (*w) and (*h) will contain the images dimensions on
+//  return.
+// Returns NULL on failure (unsupported, etc) and a pointer to the
+//  uncompressed data on success. Caller must free() the returned pointer!
+uint8 *decodeImage(const uint8 *data, uint32 size, uint32 *w, uint32 *h);
 
 // See if a given flag was on the command line
 //