Convert SDL_malloc to SDL_calloc if appropriate, slightly faster on o…

…perating systems which map the zero page for memory allocations.

OpenGL renderer in progress

include/SDL_video.h

@@ -191,7 +191,7 @@ typedef struct SDL_RendererInfo
     Uint32 blend_modes;         /**< A mask of supported blend modes */
     Uint32 scale_modes;         /**< A mask of supported scale modes */
     Uint32 num_texture_formats; /**< The number of available texture formats */
-    Uint32 texture_formats[16]; /**< The available texture formats */
+    Uint32 texture_formats[20]; /**< The available texture formats */
     int max_texture_width;      /**< The maximimum texture width */
     int max_texture_height;     /**< The maximimum texture height */
 } SDL_RendererInfo;

src/video/SDL_pixels.c

@@ -346,12 +346,11 @@ SDL_AllocFormat(int bpp,
     Uint32 mask;
 
     /* Allocate an empty pixel format structure */
-    format = SDL_malloc(sizeof(*format));
+    format = SDL_calloc(1, sizeof(*format));
     if (format == NULL) {
         SDL_OutOfMemory();
         return (NULL);
     }
-    SDL_memset(format, 0, sizeof(*format));
     format->alpha = SDL_ALPHA_OPAQUE;
 
     /* Set up the format */
@@ -714,22 +713,20 @@ SDL_AllocBlitMap(void)
     SDL_BlitMap *map;
 
     /* Allocate the empty map */
-    map = (SDL_BlitMap *) SDL_malloc(sizeof(*map));
+    map = (SDL_BlitMap *) SDL_calloc(1, sizeof(*map));
     if (map == NULL) {
         SDL_OutOfMemory();
         return (NULL);
     }
-    SDL_memset(map, 0, sizeof(*map));
 
     /* Allocate the software blit data */
     map->sw_data =
-        (struct private_swaccel *) SDL_malloc(sizeof(*map->sw_data));
+        (struct private_swaccel *) SDL_calloc(1, sizeof(*map->sw_data));
     if (map->sw_data == NULL) {
         SDL_FreeBlitMap(map);
         SDL_OutOfMemory();
         return (NULL);
     }
-    SDL_memset(map->sw_data, 0, sizeof(*map->sw_data));
 
     /* It's ready to go */
     return (map);