handle some edge cases with 0 sized canvas

3 files changed, 13 insertions, 2 deletions

diff --git a/.gitignore b/.gitignore
index ab3b8fd..8ad6369 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 *.exe
 *.obj
-platform_x11
+*.ilk
+*.pdb
+*.rdi
diff --git a/run.bat b/run.bat
index 0eb177d..0ec23a4 100644
--- a/run.bat
+++ b/run.bat
@@ -1,4 +1,4 @@
 del out.exe
 del *.obj
-cl platform_win32.c "examples\%1" user32.lib gdi32.lib /W3 /Fe:out.exe
+cl platform_win32.c "examples\%1" user32.lib gdi32.lib /W3 /Fe:out.exe /Z7
 out.exe
diff --git a/sponge.h b/sponge.h
index 5229bd9..b6fb336 100644
--- a/sponge.h
+++ b/sponge.h
@@ -15,7 +15,13 @@ void sponge_draw_texture(sponge_Texture c, uint32_t x0, uint32_t y0, sponge_Text
 
 #ifdef SPONGE_IMPLEMENTATION
 
+int sponge__canvas_valid(sponge_Texture c) {
+    return c.width != 0 && c.height != 0;
+}
+
 void sponge_clear(sponge_Texture c, uint32_t color) {
+    if (!sponge__canvas_valid(c))
+        return;
     sponge_draw_rect(c, 0, 0, c.width - 1, c.height - 1, color);
 }
 
@@ -32,6 +38,9 @@ void sponge_draw_rect(sponge_Texture c, uint32_t x0, uint32_t y0, uint32_t x1, u
 }
 
 void sponge_draw_texture(sponge_Texture c, uint32_t x0, uint32_t y0, sponge_Texture tex) {
+    if (!sponge__canvas_valid(c))
+        return;
+
     uint32_t *row_dst = c.pixels + (y0 * c.stride);
     uint32_t *row_src = tex.pixels;
     uint32_t x1 = x0 + tex.width;