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Bug 1874314 - Better anti-aliasing for subpixel rectangles. r=aosmond 

The existing distance-to-edge AA scheme breaks down somewhat when rectangles
have subpixel areas. We need to bias the AA to account for this situation when
the scales get to these subpixel sizes.

Differential Revision: https://phabricator.services.mozilla.com/D215095
This commit is contained in:
Lee Salzman 2024-06-28 00:42:56 +00:00
Родитель 78b98f5a51
Коммит ed476af81c
1 изменённых файлов: 8 добавлений и 6 удалений
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14
dom/canvas/DrawTargetWebgl.cpp
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@ -1221,8 +1221,8 @@ bool SharedContextWebgl::CreateShaders() {
" dot(u_transform[1], u_transform[1]));\n"
" vec2 invScale = u_aa * inversesqrt(scale + 1.0e-6);\n"
" scale *= invScale;\n"
" vec2 extrude = a_vertex.xy + invScale * (2.0 * a_vertex.xy - "
"1.0);\n"
" vec2 extrude = a_vertex.xy +\n"
" invScale * (2.0 * a_vertex.xy - 1.0);\n"
" vec2 vertex = u_transform[0] * extrude.x +\n"
" u_transform[1] * extrude.y +\n"
" u_transform[2];\n"
@ -1230,7 +1230,8 @@ bool SharedContextWebgl::CreateShaders() {
" v_cliptc = vertex / u_viewport;\n"
" v_clipdist = vec4(vertex - u_clipbounds.xy,\n"
" u_clipbounds.zw - vertex);\n"
" v_dist = vec4(extrude, 1.0 - extrude) * scale.xyxy + 1.5 - u_aa;\n"
" v_dist = vec4(extrude, 1.0 - extrude) * scale.xyxy +\n"
" 0.5 * min(scale.xyxy, 1.0) + (1.0 - u_aa);\n"
" v_alpha = a_vertex.z;\n"
"}\n";
auto fsSource =
@ -1301,8 +1302,8 @@ bool SharedContextWebgl::CreateShaders() {
" dot(u_transform[1], u_transform[1]));\n"
" vec2 invScale = u_aa * inversesqrt(scale + 1.0e-6);\n"
" scale *= invScale;\n"
" vec2 extrude = a_vertex.xy + invScale * (2.0 * a_vertex.xy - "
"1.0);\n"
" vec2 extrude = a_vertex.xy +\n"
" invScale * (2.0 * a_vertex.xy - 1.0);\n"
" vec2 vertex = u_transform[0] * extrude.x +\n"
" u_transform[1] * extrude.y +\n"
" u_transform[2];\n"
@ -1313,7 +1314,8 @@ bool SharedContextWebgl::CreateShaders() {
" v_texcoord = u_texmatrix[0] * extrude.x +\n"
" u_texmatrix[1] * extrude.y +\n"
" u_texmatrix[2];\n"
" v_dist = vec4(extrude, 1.0 - extrude) * scale.xyxy + 1.5 - u_aa;\n"
" v_dist = vec4(extrude, 1.0 - extrude) * scale.xyxy +\n"
" 0.5 * min(scale.xyxy, 1.0) + (1.0 - u_aa);\n"
" v_alpha = a_vertex.z;\n"
"}\n";
auto fsSource =