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ngl: Avoid huge intermediate textures

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Instead of rendering the unclipped child to a texture
(and risking blowing the texture size limit, and bad
downscaling), just render the clipped region, and live
with the fact that we can't cache the rendered texture.

This avoid bad artifacts when scrolling long textviews
in rounded clips.
This commit is contained in:
Matthias Clasen 2021-04-02 19:33:44 -04:00
parent 1b81af591d
commit 8bb1b8da57
1 changed files with 4 additions and 11 deletions
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15
gsk/ngl/gsknglrenderjob.c
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@ -1498,21 +1498,14 @@ gsk_ngl_render_job_visit_clipped_child (GskNglRenderJob *job,
}
else
{
GskRoundedRect scaled_clip;
GskNglRenderOffscreen offscreen = {0};
offscreen.bounds = &child->bounds;
offscreen.bounds = clip;
offscreen.force_offscreen = TRUE;
offscreen.reset_clip = FALSE;
offscreen.reset_clip = TRUE;
offscreen.do_not_cache = TRUE;
scaled_clip = GSK_ROUNDED_RECT_INIT ((job->offset_x + clip->origin.x) * job->scale_x,
(job->offset_y + clip->origin.y) * job->scale_y,
clip->size.width * job->scale_x,
clip->size.height * job->scale_y);
gsk_ngl_render_job_push_clip (job, &scaled_clip);
gsk_ngl_render_job_visit_node_with_offscreen (job, child, &offscreen);
gsk_ngl_render_job_pop_clip (job);
g_assert (offscreen.texture_id);
@ -1522,7 +1515,7 @@ gsk_ngl_render_job_visit_clipped_child (GskNglRenderJob *job,
GL_TEXTURE_2D,
GL_TEXTURE0,
offscreen.texture_id);
gsk_ngl_render_job_draw_offscreen_rect (job, &child->bounds);
gsk_ngl_render_job_draw_offscreen_rect (job, clip);
gsk_ngl_render_job_end_draw (job);
}
}