1 files changed, 10 insertions, 5 deletions
diff --git a/src/mesa/main/readpix.c b/src/mesa/main/readpix.c
index 25823230d62..606d1e58e5a 100644
--- a/src/mesa/main/readpix.c
+++ b/src/mesa/main/readpix.c
@@ -220,7 +220,7 @@ readpixels_memcpy(struct gl_context *ctx,
    struct gl_renderbuffer *rb =
          _mesa_get_read_renderbuffer_for_format(ctx, format);
    GLubyte *dst, *map;
-   int dstStride, stride, j, texelBytes;
+   int dstStride, stride, j, texelBytes, bytesPerRow;
 
    /* Fail if memcpy cannot be used. */
    if (!readpixels_can_use_memcpy(ctx, format, type, packing)) {
@@ -239,12 +239,17 @@ readpixels_memcpy(struct gl_context *ctx,
    }
 
    texelBytes = _mesa_get_format_bytes(rb->Format);
+   bytesPerRow = texelBytes * width;
 
    /* memcpy*/
-   for (j = 0; j < height; j++) {
-      memcpy(dst, map, width * texelBytes);
-      dst += dstStride;
-      map += stride;
+   if (dstStride == stride && dstStride == bytesPerRow) {
+      memcpy(dst, map, bytesPerRow * height);
+   } else {
+      for (j = 0; j < height; j++) {
+         memcpy(dst, map, bytesPerRow);
+         dst += dstStride;
+         map += stride;
+      }
    }
 
    ctx->Driver.UnmapRenderbuffer(ctx, rb);