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mesa: small optimization of _mesa_expand_bitmap()

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Avoid a per-pixel multiply.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Brian Paul 2016-02-19 08:51:51 -07:00
parent 8a2a1a6bd6
commit 0eb7b5c2a3
1 changed files with 4 additions and 7 deletions
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11
src/mesa/main/image.c
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@ -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
}