[cairo] [PATCH v2 1/3] gl: Convert images to rgba or a8 formats when uploading with GLESv2

[Bill Spitzak]

Apparently GL_EXT_texture_format_BGRA8888 is very often supported, not
sure if that would help at all however.



On Wed, Jun 14, 2017 at 4:37 PM, Bryce Harrington <bryce at osg.samsung.com> wrote:
> From: Bryce Harrington <bryce at bryceharrington.org>
>
> The GLESv2 backend supports only GL_RGBA and GL_ALPHA as supported
> texture formats.  So, make _cairo_gl_get_image_format_and_type_gles2
> force conversion of other image formats to either of these two as
> appropriate when uploading images.
>
> Patch originally from Henry Song <henry.song at samsung.com>
>
> Signed-off-by: Bryce Harrington <bryce at osg.samsung.com>
> ---
>  src/cairo-gl-surface.c          | 45 +++++++++++++++++++++++++++++++++++++++++
>  src/cairo-gl-traps-compositor.c | 30 ---------------------------
>  2 files changed, 45 insertions(+), 30 deletions(-)
>
> diff --git a/src/cairo-gl-surface.c b/src/cairo-gl-surface.c
> index e5e8205..8ecc3a9 100644
> --- a/src/cairo-gl-surface.c
> +++ b/src/cairo-gl-surface.c
> @@ -868,12 +868,54 @@ _cairo_gl_surface_draw_image (cairo_gl_surface_t *dst,
>      cairo_image_surface_t *clone = NULL;
>      cairo_gl_context_t *ctx;
>      int cpp;
> +    cairo_image_surface_t *rgba_clone = NULL;
>      cairo_int_status_t status = CAIRO_INT_STATUS_SUCCESS;
>
>      status = _cairo_gl_context_acquire (dst->base.device, &ctx);
>      if (unlikely (status))
>         return status;
>
> +    if (_cairo_gl_get_flavor () == CAIRO_GL_FLAVOR_ES2) {
> +       pixman_format_code_t pixman_format;
> +       cairo_surface_pattern_t pattern;
> +       cairo_bool_t require_conversion = FALSE;
> +       pixman_format = _cairo_is_little_endian () ? PIXMAN_a8b8g8r8 : PIXMAN_r8g8b8a8;
> +
> +       if (src->base.content != CAIRO_CONTENT_ALPHA) {
> +           if (src->pixman_format != pixman_format)
> +               require_conversion = TRUE;
> +       }
> +       else if (dst->base.content != CAIRO_CONTENT_ALPHA)
> +           require_conversion = TRUE;
> +       else {
> +           if (src->pixman_format == PIXMAN_a1) {
> +               pixman_format = PIXMAN_a8;
> +               require_conversion = TRUE;
> +           }
> +       }
> +
> +       if (require_conversion) {
> +           rgba_clone = (cairo_image_surface_t *)
> +               _cairo_image_surface_create_with_pixman_format (NULL,
> +                                                               pixman_format,
> +                                                               src->width,
> +                                                               src->height,
> +                                                               0);
> +           if (unlikely (rgba_clone->base.status))
> +               goto FAIL;
> +
> +           _cairo_pattern_init_for_surface (&pattern, &src->base);
> +           status = _cairo_surface_paint (&rgba_clone->base,
> +                                          CAIRO_OPERATOR_SOURCE,
> +                                          &pattern.base, NULL);
> +           _cairo_pattern_fini (&pattern.base);
> +           if (unlikely (status))
> +               goto FAIL;
> +
> +           src = rgba_clone;
> +       }
> +    }
> +
>      if (! _cairo_gl_get_image_format_and_type (ctx->gl_flavor,
>                                                src->pixman_format,
>                                                &internal_format,
> @@ -1008,6 +1050,9 @@ FAIL:
>      if (clone)
>          cairo_surface_destroy (&clone->base);
>
> +    if (rgba_clone)
> +       cairo_surface_destroy (&rgba_clone->base);
> +
>      return status;
>  }
>
> diff --git a/src/cairo-gl-traps-compositor.c b/src/cairo-gl-traps-compositor.c
> index 664a27a..1e11006 100644
> --- a/src/cairo-gl-traps-compositor.c
> +++ b/src/cairo-gl-traps-compositor.c
> @@ -303,36 +303,6 @@ traps_to_operand (void *_dst,
>         return image->status;
>      }
>
> -    /* GLES2 only supports RGB/RGBA when uploading */
> -    if (_cairo_gl_get_flavor () == CAIRO_GL_FLAVOR_ES2) {
> -       cairo_surface_pattern_t pattern;
> -       cairo_surface_t *rgba_image;
> -
> -       /* XXX perform this fixup inside _cairo_gl_draw_image() */
> -
> -       rgba_image =
> -           _cairo_image_surface_create_with_pixman_format (NULL,
> -                                                           _cairo_is_little_endian () ?  PIXMAN_a8b8g8r8 : PIXMAN_r8g8b8a8,
> -                                                           extents->width,
> -                                                           extents->height,
> -                                                           0);
> -       if (unlikely (rgba_image->status))
> -           return rgba_image->status;
> -
> -       _cairo_pattern_init_for_surface (&pattern, image);
> -       status = _cairo_surface_paint (rgba_image, CAIRO_OPERATOR_SOURCE,
> -                                      &pattern.base, NULL);
> -       _cairo_pattern_fini (&pattern.base);
> -
> -       cairo_surface_destroy (image);
> -       image = rgba_image;
> -
> -       if (unlikely (status)) {
> -           cairo_surface_destroy (image);
> -           return status;
> -       }
> -    }
> -
>      mask = _cairo_surface_create_scratch (_dst,
>                                           CAIRO_CONTENT_COLOR_ALPHA,
>                                           extents->width,
> --
> 2.7.4
>
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