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gsk: Handle 2D transforms better

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For 2D transforms, we can read the scale
factors more directly off the matrix.

This should eventually be moved out into a
function to decompose a 2D transform into
scale + rotation + skew + translation.
This commit is contained in:
Matthias Clasen 2021-09-17 09:42:20 -04:00
parent 27d662f1aa
commit 6a60214e8c
1 changed files with 12 additions and 1 deletions
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13
gsk/ngl/gsknglrenderjob.c
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@ -453,10 +453,21 @@ extract_matrix_metadata (GskNglRenderModelview *modelview)
&modelview->dx, &modelview->dy);
break;
case GSK_TRANSFORM_CATEGORY_2D:
{
float xx, xy, yx, yy, dx, dy;
gsk_transform_to_2d (modelview->transform,
&xx, &xy, &yx, &yy, &dx, &dy);
modelview->scale_x = sqrtf (xx * xx + xy * xy);
modelview->scale_y = sqrtf (yx * yx + yy * yy);
}
break;
case GSK_TRANSFORM_CATEGORY_UNKNOWN:
case GSK_TRANSFORM_CATEGORY_ANY:
case GSK_TRANSFORM_CATEGORY_3D:
case GSK_TRANSFORM_CATEGORY_2D:
{
graphene_vec3_t col1;
graphene_vec3_t col2;