wined3d: Introduce a separate function to calculate the pitch for a given format and width.

dlls/wined3d/surface.c

@@ -2435,7 +2435,7 @@ struct wined3d_palette * CDECL wined3d_surface_get_palette(const struct wined3d_
 
 DWORD CDECL wined3d_surface_get_pitch(const struct wined3d_surface *surface)
 {
-    const struct wined3d_format *format = surface->resource.format;
+    unsigned int alignment;
     DWORD pitch;
 
     TRACE("surface %p.\n", surface);
@@ -2443,19 +2443,9 @@ DWORD CDECL wined3d_surface_get_pitch(const struct wined3d_surface *surface)
     if (surface->pitch)
         return surface->pitch;
 
-    if (format->flags & WINED3DFMT_FLAG_BLOCKS)
+    alignment = surface->resource.device->surface_alignment;
-    {
+    pitch = wined3d_format_calculate_pitch(surface->resource.format, surface->resource.width);
-        /* Since compressed formats are block based, pitch means the amount of
-         * bytes to the next row of block rather than the next row of pixels. */
-        UINT row_block_count = (surface->resource.width + format->block_width - 1) / format->block_width;
-        pitch = row_block_count * format->block_byte_count;
-    }
-    else
-    {
-        unsigned char alignment = surface->resource.device->surface_alignment;
-        pitch = surface->resource.format->byte_count * surface->resource.width;  /* Bytes / row */
     pitch = (pitch + alignment - 1) & ~(alignment - 1);
-    }
 
     TRACE("Returning %u.\n", pitch);
 

dlls/wined3d/utils.c

@@ -2019,9 +2019,20 @@ const struct wined3d_format *wined3d_get_format(const struct wined3d_gl_info *gl
     return &gl_info->formats[idx];
 }
 
+UINT wined3d_format_calculate_pitch(const struct wined3d_format *format, UINT width)
+{
+    /* For block based formats, pitch means the amount of bytes to the next
+     * row of blocks rather than the next row of pixels. */
+    if (format->flags & WINED3DFMT_FLAG_BLOCKS)
+        return format->block_byte_count * ((width + format->block_width - 1) / format->block_width);
+
+    return format->byte_count * width;
+}
+
 UINT wined3d_format_calculate_size(const struct wined3d_format *format, UINT alignment,
         UINT width, UINT height, UINT depth)
 {
+    UINT pitch = wined3d_format_calculate_pitch(format, width);
     UINT size;
 
     if (format->id == WINED3DFMT_UNKNOWN)
@@ -2030,13 +2041,12 @@ UINT wined3d_format_calculate_size(const struct wined3d_format *format, UINT ali
     }
     else if (format->flags & WINED3DFMT_FLAG_BLOCKS)
     {
-        UINT row_block_count = (width + format->block_width - 1) / format->block_width;
         UINT row_count = (height + format->block_height - 1) / format->block_height;
-        size = row_count * (((row_block_count * format->block_byte_count) + alignment - 1) & ~(alignment - 1));
+        size = row_count * ((pitch + alignment - 1) & ~(alignment - 1));
     }
     else
     {
-        size = height * (((width * format->byte_count) + alignment - 1) & ~(alignment - 1));
+        size = height * ((pitch + alignment - 1) & ~(alignment - 1));
     }
 
     if (format->flags & WINED3DFMT_FLAG_HEIGHT_SCALE)

dlls/wined3d/wined3d_private.h

@@ -3040,6 +3040,7 @@ struct wined3d_format
 
 const struct wined3d_format *wined3d_get_format(const struct wined3d_gl_info *gl_info,
         enum wined3d_format_id format_id) DECLSPEC_HIDDEN;
+UINT wined3d_format_calculate_pitch(const struct wined3d_format *format, UINT width) DECLSPEC_HIDDEN;
 UINT wined3d_format_calculate_size(const struct wined3d_format *format,
         UINT alignment, UINT width, UINT height, UINT depth) DECLSPEC_HIDDEN;
 DWORD wined3d_format_convert_from_float(const struct wined3d_surface *surface,