Mesa (master): mesa: small optimization of _mesa_expand_bitmap()

[Brian Paul]

Module: Mesa
Branch: master
Commit: 0eb7b5c2a3f17d64e85247c1f4907ce20bc57a73
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=0eb7b5c2a3f17d64e85247c1f4907ce20bc57a73

Author: Brian Paul <brianp at vmware.com>
Date:   Fri Feb 19 08:51:51 2016 -0700

mesa: small optimization of _mesa_expand_bitmap()

Avoid a per-pixel multiply.

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/main/image.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/src/mesa/main/image.c b/src/mesa/main/image.c
index 99f253c..4d6ab6f 100644
--- a/src/mesa/main/image.c
+++ b/src/mesa/main/image.c
@@ -408,9 +408,7 @@ _mesa_expand_bitmap(GLsizei width, GLsizei height,
    const GLint srcStride = _mesa_image_row_stride(unpack, width,
                                                   GL_COLOR_INDEX, GL_BITMAP);
    GLint row, col;
-
-#define SET_PIXEL(COL, ROW) \
-   destBuffer[(ROW) * destStride + (COL)] = onValue;
+   GLubyte *dstRow = destBuffer;
 
    for (row = 0; row < height; row++) {
       const GLubyte *src = srcRow;
@@ -421,7 +419,7 @@ _mesa_expand_bitmap(GLsizei width, GLsizei height,
          for (col = 0; col < width; col++) {
 
             if (*src & mask) {
-               SET_PIXEL(col, row);
+               dstRow[col] = onValue;
             }
 
             if (mask == 128U) {
@@ -443,7 +441,7 @@ _mesa_expand_bitmap(GLsizei width, GLsizei height,
          for (col = 0; col < width; col++) {
 
             if (*src & mask) {
-               SET_PIXEL(col, row);
+               dstRow[col] = onValue;
             }
 
             if (mask == 1U) {
@@ -461,9 +459,8 @@ _mesa_expand_bitmap(GLsizei width, GLsizei height,
       }
 
       srcRow += srcStride;
+      dstRow += destStride;
    } /* row */
-
-#undef SET_PIXEL
 }