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app/display: don't evaluate alpha value several times 

The GIMP_CAIRO_ARGB32_SET_PIXEL() macro will evaluate the alpha
parameter multiple times, so we better calculate alpha beforehand.
This commit is contained in:
Sven Neumann 2010-09-26 22:25:49 +02:00
parent 2f3c6af28b
commit 1d17042efb
1 changed files with 33 additions and 9 deletions
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42
app/display/gimpdisplayshell-preview.c
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@ -687,16 +687,18 @@ gimp_display_shell_draw_tri_row (GimpDrawable *texture,
while (dx--)
{
register gulong tmp;
guchar alpha;
read_pixel_data_1 (tiles, (gint) u, (gint) v, pixel);
offset = pixel[0] + pixel[0] + pixel[0];
alpha = INT_MULT (opacity, pixel[1], tmp);
GIMP_CAIRO_ARGB32_SET_PIXEL (pptr,
cmap[offset + 0],
cmap[offset + 1],
cmap[offset + 2],
INT_MULT (opacity, pixel[1], tmp));
alpha);
pptr += 4;
@ -727,14 +729,17 @@ gimp_display_shell_draw_tri_row (GimpDrawable *texture,
while (dx--)
{
register gulong tmp;
guchar alpha;
read_pixel_data_1 (tiles, (gint) u, (gint) v, pixel);
alpha = INT_MULT (opacity, pixel[1], tmp);
GIMP_CAIRO_ARGB32_SET_PIXEL (pptr,
pixel[0],
pixel[0],
pixel[0],
INT_MULT (opacity, pixel[1], tmp));
alpha);
pptr += 4;
@ -765,14 +770,17 @@ gimp_display_shell_draw_tri_row (GimpDrawable *texture,
while (dx--)
{
register gulong tmp;
guchar alpha;
read_pixel_data_1 (tiles, (gint) u, (gint) v, pixel);
alpha = INT_MULT (opacity, pixel[3], tmp);
GIMP_CAIRO_ARGB32_SET_PIXEL (pptr,
pixel[0],
pixel[1],
pixel[2],
INT_MULT (opacity, pixel[3], tmp));
alpha);
pptr += 4;
@ -895,17 +903,19 @@ gimp_display_shell_draw_tri_row_mask (GimpDrawable *texture,
while (dx--)
{
register gulong tmp;
guchar alpha;
read_pixel_data_1 (tiles, (gint) u, (gint) v, pixel);
read_pixel_data_1 (masktiles, (gint) mu, (gint) mv, &maskval);
offset = pixel[0] + pixel[0] + pixel[0];
alpha = INT_MULT (opacity, maskval, tmp);
GIMP_CAIRO_ARGB32_SET_PIXEL (pptr,
cmap[offset + 0],
cmap[offset + 1],
cmap[offset + 2],
INT_MULT (opacity, maskval, tmp));
alpha);
pptr += 4;
@ -922,17 +932,19 @@ gimp_display_shell_draw_tri_row_mask (GimpDrawable *texture,
while (dx--)
{
register gulong tmp;
guchar alpha;
read_pixel_data_1 (tiles, (gint) u, (gint) v, pixel);
read_pixel_data_1 (masktiles, (gint) mu, (gint) mv, &maskval);
offset = pixel[0] + pixel[0] + pixel[0];
alpha = INT_MULT3 (opacity, maskval, pixel[1], tmp);
GIMP_CAIRO_ARGB32_SET_PIXEL (pptr,
cmap[offset + 0],
cmap[offset + 1],
cmap[offset + 2],
INT_MULT3 (opacity, maskval, pixel[1], tmp));
alpha);
pptr += 4;
@ -947,15 +959,18 @@ gimp_display_shell_draw_tri_row_mask (GimpDrawable *texture,
while (dx--)
{
register gulong tmp;
guchar alpha;
read_pixel_data_1 (tiles, (gint) u, (gint) v, pixel);
read_pixel_data_1 (masktiles, (gint) mu, (gint) mv, &maskval);
alpha = INT_MULT (opacity, maskval, tmp);
GIMP_CAIRO_ARGB32_SET_PIXEL (pptr,
pixel[0],
pixel[0],
pixel[0],
INT_MULT (opacity, maskval, tmp));
alpha);
pptr += 4;
@ -970,15 +985,18 @@ gimp_display_shell_draw_tri_row_mask (GimpDrawable *texture,
while (dx--)
{
register gulong tmp;
guchar alpha;
read_pixel_data_1 (tiles, (gint) u, (gint) v, pixel);
read_pixel_data_1 (masktiles, (gint) mu, (gint) mv, &maskval);
alpha = INT_MULT3 (opacity, maskval, pixel[1], tmp);
GIMP_CAIRO_ARGB32_SET_PIXEL (pptr,
pixel[0],
pixel[0],
pixel[0],
INT_MULT3 (opacity, maskval, pixel[1], tmp));
alpha);
pptr += 4;
@ -993,15 +1011,18 @@ gimp_display_shell_draw_tri_row_mask (GimpDrawable *texture,
while (dx--)
{
register gulong tmp;
guchar alpha;
read_pixel_data_1 (tiles, (gint) u, (gint) v, pixel);
read_pixel_data_1 (masktiles, (gint) mu, (gint) mv, &maskval);
alpha = INT_MULT (opacity, maskval, tmp);
GIMP_CAIRO_ARGB32_SET_PIXEL (pptr,
pixel[0],
pixel[1],
pixel[2],
INT_MULT (opacity, maskval, tmp));
alpha);
pptr += 4;
@ -1016,15 +1037,18 @@ gimp_display_shell_draw_tri_row_mask (GimpDrawable *texture,
while (dx--)
{
register gulong tmp;
guchar alpha;
read_pixel_data_1 (tiles, (gint) u, (gint) v, pixel);
read_pixel_data_1 (masktiles, (gint) mu, (gint) mv, &maskval);
alpha = INT_MULT3 (opacity, maskval, pixel[3], tmp);
GIMP_CAIRO_ARGB32_SET_PIXEL (pptr,
pixel[0],
pixel[1],
pixel[2],
INT_MULT3 (opacity, maskval, pixel[3], tmp));
alpha);
pptr += 4;