gsk/vulkan/renderpass: Update scales from transform node

Retrieve the scale from the transform node, and store it as long
as the transform node is being visited. This applies the proper
scale to text nodes.

1 files changed, 78 insertions, 6 deletions

diff --git a/gsk/vulkan/gskvulkanrenderpass.c b/gsk/vulkan/gskvulkanrenderpass.c
index cd412e7df3..458d2b1fa4 100644
--- a/gsk/vulkan/gskvulkanrenderpass.c
+++ b/gsk/vulkan/gskvulkanrenderpass.c
@@ -503,28 +503,100 @@ gsk_vulkan_render_pass_add_transform_node (GskVulkanRenderPass          *self,
   GskVulkanOp op = {
     .render.node = node
   };
-  graphene_matrix_t transform, mv;
+  graphene_matrix_t old_mv;
   GskRenderNode *child;
+  GskTransform *next_transform;
+  GskTransform *transform;
+  float new_scale_x = self->scale_x;
+  float new_scale_y = self->scale_x;
+  float old_scale_x;
+  float old_scale_y;
 
 #if 0
  if (!gsk_vulkan_clip_contains_rect (clip, &node->bounds))
     FALLBACK ("Transform nodes can't deal with clip type %u\n", clip->type);
 #endif
 
+  transform = gsk_transform_node_get_transform (node);
+
+  switch (gsk_transform_get_category (transform))
+    {
+    case GSK_TRANSFORM_CATEGORY_IDENTITY:
+    case GSK_TRANSFORM_CATEGORY_2D_TRANSLATE:
+      break;
+
+    case GSK_TRANSFORM_CATEGORY_2D_AFFINE:
+      {
+        float dx, dy;
+        gsk_transform_to_affine (transform, &new_scale_x, &new_scale_y, &dx, &dy);
+      }
+      break;
+
+    case GSK_TRANSFORM_CATEGORY_2D:
+      {
+        float xx, xy, yx, yy, dx, dy;
+
+        gsk_transform_to_2d (transform,
+                             &xx, &xy, &yx, &yy, &dx, &dy);
+
+        new_scale_x = sqrtf (xx * xx + xy * xy);
+        new_scale_y = sqrtf (yx * yx + yy * yy);
+      }
+      break;
+
+    case GSK_TRANSFORM_CATEGORY_UNKNOWN:
+    case GSK_TRANSFORM_CATEGORY_ANY:
+    case GSK_TRANSFORM_CATEGORY_3D:
+      {
+        graphene_quaternion_t rotation;
+        graphene_matrix_t matrix;
+        graphene_vec4_t perspective;
+        graphene_vec3_t translation;
+        graphene_vec3_t scale;
+        graphene_vec3_t shear;
+
+        gsk_transform_to_matrix (transform, &matrix);
+        graphene_matrix_decompose (&matrix,
+                                   &translation,
+                                   &scale,
+                                   &rotation,
+                                   &shear,
+                                   &perspective);
+
+        new_scale_x = graphene_vec3_get_x (&scale);
+        new_scale_y = graphene_vec3_get_y (&scale);
+      }
+      break;
+
+    default:
+      break;
+    }
+
+  old_mv = self->mv;
+  old_scale_x = self->scale_x;
+  old_scale_y = self->scale_y;
+
+  self->scale_x = new_scale_x;
+  self->scale_y = new_scale_y;
+
+  next_transform = gsk_transform_matrix (gsk_transform_ref (transform), &self->mv);
+  gsk_transform_to_matrix (next_transform, &self->mv);
+
   child = gsk_transform_node_get_child (node);
-  gsk_transform_to_matrix (gsk_transform_node_get_transform (node), &transform);
-  graphene_matrix_init_from_matrix (&mv, &self->mv);
-  graphene_matrix_multiply (&transform, &mv, &self->mv);
-  if (!gsk_vulkan_push_constants_transform (&op.constants.constants, constants, gsk_transform_node_get_transform (node), &child->bounds))
+  if (!gsk_vulkan_push_constants_transform (&op.constants.constants, constants, transform, &child->bounds))
     FALLBACK ("Transform nodes can't deal with clip type %u", constants->clip.type);
   op.type = GSK_VULKAN_OP_PUSH_VERTEX_CONSTANTS;
   g_array_append_val (self->render_ops, op);
 
   gsk_vulkan_render_pass_add_node (self, render, &op.constants.constants, child);
+
   gsk_vulkan_push_constants_init_copy (&op.constants.constants, constants);
-  graphene_matrix_init_from_matrix (&self->mv, &mv);
   g_array_append_val (self->render_ops, op);
 
+  self->scale_x = old_scale_x;
+  self->scale_y = old_scale_y;
+  self->mv = old_mv;
+
   return TRUE;
 }