[tor-commits] [tor-browser] 27/34: Bug 1706441 - Check for non-empty span. r=gfx-reviewers, aosmond, a=dsmith

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richard pushed a commit to branch tor-browser-91.9esr-11.0-1
in repository tor-browser.

commit b43a81f502f8890fa71787d1bfd083ead65d77a5
Author: Lee Salzman <lsalzman@xxxxxxxxxxx>
AuthorDate: Wed Apr 6 16:11:18 2022 +0000

    Bug 1706441 - Check for non-empty span. r=gfx-reviewers,aosmond,a=dsmith
    
    Differential Revision: https://phabricator.services.mozilla.com/D142429
---
 gfx/wr/swgl/src/swgl_ext.h | 42 ++++++++++++++++++++++++++----------------
 1 file changed, 26 insertions(+), 16 deletions(-)

diff --git a/gfx/wr/swgl/src/swgl_ext.h b/gfx/wr/swgl/src/swgl_ext.h
index d3dee3cb88bea..b5cf845ed0a68 100644
--- a/gfx/wr/swgl/src/swgl_ext.h
+++ b/gfx/wr/swgl/src/swgl_ext.h
@@ -413,26 +413,36 @@ static P* blendTextureLinearDispatch(S sampler, vec2 uv, int span,
                             swgl_LinearQuantizeScale)) -
         uv.x.x;
     if (uv_step.x > 0.0f && insideDist >= uv_step.x) {
-      int inside = int(end - buf);
+      int32_t inside = int(end - buf);
       if (filter == LINEAR_FILTER_DOWNSCALE) {
-        inside = clamp(int(insideDist * (0.5f / swgl_LinearQuantizeScale)) &
-                           ~(swgl_StepSize - 1),
-                       0, inside);
-        blendTextureLinearDownscale<BLEND>(sampler, uv, inside, min_uv, max_uv,
-                                           color, buf);
+        inside = min(int(insideDist * (0.5f / swgl_LinearQuantizeScale)) &
+                         ~(swgl_StepSize - 1),
+                     inside);
+        if (inside > 0) {
+          blendTextureLinearDownscale<BLEND>(sampler, uv, inside, min_uv,
+                                             max_uv, color, buf);
+          buf += inside;
+          uv.x += (inside / swgl_StepSize) * uv_step.x;
+        }
       } else if (filter == LINEAR_FILTER_UPSCALE) {
-        inside = clamp(int(insideDist / uv_step.x) * swgl_StepSize, 0, inside);
-        blendTextureLinearUpscale<BLEND>(sampler, uv, inside, uv_step, min_uv,
-                                         max_uv, color, buf);
+        inside = min(int(insideDist / uv_step.x) * swgl_StepSize, inside);
+        if (inside > 0) {
+          blendTextureLinearUpscale<BLEND>(sampler, uv, inside, uv_step, min_uv,
+                                           max_uv, color, buf);
+          buf += inside;
+          uv.x += (inside / swgl_StepSize) * uv_step.x;
+        }
       } else {
-        inside = clamp(int(insideDist * (1.0f / swgl_LinearQuantizeScale)) &
-                           ~(swgl_StepSize - 1),
-                       0, inside);
-        blendTextureLinearFast<BLEND>(sampler, uv, inside, min_uv, max_uv,
-                                      color, buf);
+        inside = min(int(insideDist * (1.0f / swgl_LinearQuantizeScale)) &
+                         ~(swgl_StepSize - 1),
+                     inside);
+        if (inside > 0) {
+          blendTextureLinearFast<BLEND>(sampler, uv, inside, min_uv, max_uv,
+                                        color, buf);
+          buf += inside;
+          uv.x += (inside / swgl_StepSize) * uv_step.x;
+        }
       }
-      buf += inside;
-      uv.x += (inside / swgl_StepSize) * uv_step.x;
     }
   }
   // If the fallback filter was requested, or if there are any samples left that

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