handle SDL_LockTexture failure

2 files changed, 11 insertions, 6 deletions

diff --git a/src/px.c b/src/px.c
index 5c1af9b..694c789 100644
--- a/src/px.c
+++ b/src/px.c
@@ -40,7 +40,7 @@ pxInit(void)
 	                              PX_WIDTH, PX_HEIGHT);
 	if (pxtexture == NULL) {
 		fprintf(stderr, "%s\n", SDL_GetError());
-		return 1;
+		return -1;
 	}
 	return 0;
 }
@@ -54,12 +54,15 @@ pxDeinit(void)
 	}
 }
 
-void
+int
 pxFlip(void)
 {
 	uint8_t *pixels = NULL;
 	int pitch = 0;
-	SDL_LockTexture(pxtexture, NULL, (void **)&pixels, &pitch);
+	if (SDL_LockTexture(pxtexture, NULL, (void **)&pixels, &pitch)) {
+		fprintf(stderr, "%s\n", SDL_GetError());
+		return -1;
+	}
 
 	for (int y = 0; y < PX_HEIGHT; y++) {
 		for (int x = 0; x < PX_WIDTH; x++) {
diff --git a/src/px.h b/src/px.h
index f413bdc..cc59c7f 100644
--- a/src/px.h
+++ b/src/px.h
@@ -52,14 +52,16 @@ typedef struct {
 extern PxCol pxbuf[PX_WIDTH * PX_HEIGHT];
 extern PxPal pxpal[256];
 
-/* Return -1 on error. Should be called after TZR_Init. */
+/* Return -1 on error.
+ * Should be called after TZR_Init. */
 int pxInit(void);
 
 /* Should be called before TZR_Quit. */
 void pxDeinit(void);
 
-/* Should be called between TZR_DrawBegin and TZR_DrawEnd. */
-void pxFlip(void);
+/* Return -1 on error.
+ * Should be called between TZR_DrawBegin and TZR_DrawEnd. */
+int pxFlip(void);
 
 /*** DRAW ***/
 /* Fill the clipping region with color 'c'. */