gdiplus: Process a row instead of a column in inner conversion loop.

dlls/gdiplus/image.c

@@ -582,8 +582,8 @@ GpStatus convert_pixels(INT width, INT height,
     }
 
 #define convert_indexed_to_rgb(getpixel_function, setpixel_function) do { \
-    for (x=0; x<width; x++) \
-        for (y=0; y<height; y++) { \
+    for (y=0; y<height; y++) \
+        for (x=0; x<width; x++) { \
             BYTE index; \
             ARGB argb; \
             BYTE *color = (BYTE *)&argb; \
@@ -595,8 +595,8 @@ GpStatus convert_pixels(INT width, INT height,
 } while (0);
 
 #define convert_rgb_to_rgb(getpixel_function, setpixel_function) do { \
-    for (x=0; x<width; x++) \
-        for (y=0; y<height; y++) { \
+    for (y=0; y<height; y++) \
+        for (x=0; x<width; x++) { \
             BYTE r, g, b, a; \
             getpixel_function(&r, &g, &b, &a, src_bits+src_stride*y, x); \
             setpixel_function(r, g, b, a, dst_bits+dst_stride*y, x); \
@@ -605,8 +605,8 @@ GpStatus convert_pixels(INT width, INT height,
 } while (0);
 
 #define convert_rgb_to_indexed(getpixel_function, setpixel_function) do { \
-    for (x=0; x<width; x++) \
-        for (y=0; y<height; y++) { \
+    for (y=0; y<height; y++) \
+        for (x=0; x<width; x++) { \
             BYTE r, g, b, a; \
             getpixel_function(&r, &g, &b, &a, src_bits+src_stride*y, x); \
             setpixel_function(r, g, b, a, dst_bits+dst_stride*y, x, palette); \