diff options
| author | Junyan He <junyan.he@linux.intel.com> | 2012-05-15 10:07:46 +0800 |
|---|---|---|
| committer | Eric Anholt <eric@anholt.net> | 2013-12-18 11:23:51 -0800 |
| commit | 41aa93c393c8760aae357725db63fa4a8f798557 (patch) | |
| tree | 18274a4a520881f1712e95b78568d897cc17f5f3 /glamor/glamor_gradient.c | |
| parent | 09de37ec1c0543c8073f934274c84b3b7d5f31ae (diff) | |
Fix the problem of set the same stop several times.
Some gradient set the stops at the same position, for
example: firstly 0.5 to red color and then set 0.5 to
blue. This kind of setting will cause the shader work
not correctly because the percentage caculating need to
use the stop[i] - stop[i-1] as dividend. The previous
patch we just kill some stop if the distance between
them is 0. But this cause the problem that the color
for next stop is wrong. We now modify to handle it in
the shader to avoid the 0 as dividend.
Reviewed-by: Zhigang Gong <zhigang.gong@linux.intel.com>
Signed-off-by: Junyan He <junyan.he@linux.intel.com>
Signed-off-by: Zhigang Gong <zhigang.gong@linux.intel.com>
Diffstat (limited to 'glamor/glamor_gradient.c')
| -rw-r--r-- | glamor/glamor_gradient.c | 25 |
1 files changed, 8 insertions, 17 deletions
diff --git a/glamor/glamor_gradient.c b/glamor/glamor_gradient.c index 165d211b9..b24dc9f23 100644 --- a/glamor/glamor_gradient.c +++ b/glamor/glamor_gradient.c @@ -67,9 +67,12 @@ _glamor_create_getcolor_fs_program(ScreenPtr screen, int stops_count, int use_ar " break; \n" " }\n" " \n" - " percentage = (stop_len - stops[i-1])/(stops[i] - stops[i-1]);\n" " if(stops[i] - stops[i-1] > 2.0)\n" " percentage = 0.0;\n" //For comply with pixman, walker->stepper overflow. + " else if(stops[i] - stops[i-1] < 0.000001)\n" + " percentage = 0.0;\n" + " else \n" + " percentage = (stop_len - stops[i-1])/(stops[i] - stops[i-1]);\n" " new_alpha = percentage * stop_colors[i].a + \n" " (1.0-percentage) * stop_colors[i-1].a; \n" " gradient_color = vec4((percentage * stop_colors[i].rgb \n" @@ -116,58 +119,53 @@ _glamor_create_getcolor_fs_program(ScreenPtr screen, int stops_count, int use_ar " stop_color_after = stop_color0;\n" " stop_after = stop0;\n" " stop_before = stop0;\n" - " percentage = 0.0;\n" " } else if((stop_len < stop1) && (n_stop >= 2)) {\n" " stop_color_before = stop_color0;\n" " stop_color_after = stop_color1;\n" " stop_after = stop1;\n" " stop_before = stop0;\n" - " percentage = (stop_len - stop0)/(stop1 - stop0);\n" " } else if((stop_len < stop2) && (n_stop >= 3)) {\n" " stop_color_before = stop_color1;\n" " stop_color_after = stop_color2;\n" " stop_after = stop2;\n" " stop_before = stop1;\n" - " percentage = (stop_len - stop1)/(stop2 - stop1);\n" " } else if((stop_len < stop3) && (n_stop >= 4)){\n" " stop_color_before = stop_color2;\n" " stop_color_after = stop_color3;\n" " stop_after = stop3;\n" " stop_before = stop2;\n" - " percentage = (stop_len - stop2)/(stop3 - stop2);\n" " } else if((stop_len < stop4) && (n_stop >= 5)){\n" " stop_color_before = stop_color3;\n" " stop_color_after = stop_color4;\n" " stop_after = stop4;\n" " stop_before = stop3;\n" - " percentage = (stop_len - stop3)/(stop4 - stop3);\n" " } else if((stop_len < stop5) && (n_stop >= 6)){\n" " stop_color_before = stop_color4;\n" " stop_color_after = stop_color5;\n" " stop_after = stop5;\n" " stop_before = stop4;\n" - " percentage = (stop_len - stop4)/(stop5 - stop4);\n" " } else if((stop_len < stop6) && (n_stop >= 7)){\n" " stop_color_before = stop_color5;\n" " stop_color_after = stop_color6;\n" " stop_after = stop6;\n" " stop_before = stop5;\n" - " percentage = (stop_len - stop5)/(stop6 - stop5);\n" " } else if((stop_len < stop7) && (n_stop >= 8)){\n" " stop_color_before = stop_color6;\n" " stop_color_after = stop_color7;\n" " stop_after = stop7;\n" " stop_before = stop6;\n" - " percentage = (stop_len - stop6)/(stop7 - stop6);\n" " } else {\n" " stop_color_before = stop_color7;\n" " stop_color_after = stop_color7;\n" " stop_after = stop7;\n" " stop_before = stop7;\n" - " percentage = 0.0;\n" " }\n" " if(stop_after - stop_before > 2.0)\n" " percentage = 0.0;\n"//For comply with pixman, walker->stepper overflow. + " else if(stop_after - stop_before < 0.000001)\n" + " percentage = 0.0;\n" + " else \n" + " percentage = (stop_len - stop_before)/(stop_after - stop_before);\n" " new_alpha = percentage * stop_color_after.a + \n" " (1.0-percentage) * stop_color_before.a; \n" " gradient_color = vec4((percentage * stop_color_after.rgb \n" @@ -880,13 +878,6 @@ _glamor_gradient_set_stops(PicturePtr src_picture, PictGradient * pgradient, int count = 1; for (i = 0; i < pgradient->nstops; i++) { - /* We find some gradient picture set the stops at the same percentage, which - will cause the shader problem because the (stops[i] - stops[i-1]) will - be used as divisor. We just keep the later one if stops[i] == stops[i-1] */ - if (i < pgradient->nstops - 1 - && pgradient->stops[i].x == pgradient->stops[i+1].x) - continue; - stop_colors[count*4] = pixman_fixed_to_double( pgradient->stops[i].color.red); stop_colors[count*4+1] = pixman_fixed_to_double( |