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color: add from sRGB to blending color transformation

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This is needed when the compositor produces any content internally:
- the lines in triangle fan debug
- the censoring color fill (unmet HDCP requirements)

Solid color surfaces do not need this special-casing because
weston_surface is supposed to carry color space information, which will
get used in gl_shader_config_init_for_view().

This makes sure the internally produced graphics fit in, e.g on a
monitor in HDR mode.

For now, just ensure there is an identity transformation. Actual
implementations in GL-renderer will follow later.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
This commit is contained in:
Pekka Paalanen
2021-03-23 13:40:43 +02:00
committed by Pekka Paalanen
parent cda3951a9a
commit 8fb23ed110
5 changed files with 39 additions and 0 deletions
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include/libweston/libweston.h
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@@ -375,6 +375,7 @@ struct weston_output {
bool use_renderer_shadow_buffer;
struct weston_color_transform *from_sRGB_to_output;
struct weston_color_transform *from_sRGB_to_blend;
struct weston_color_transform *from_blend_to_output;
bool from_blend_to_output_by_backend;