mirror of
https://gitlab.freedesktop.org/cairo/cairo.git
synced 2026-05-15 23:08:05 +02:00
543c14a8b1
Add a new surface backend that allocates pixel buffers through GBM (Generic Buffer Manager), allowing Cairo-rendered content to be imported directly by GPU compositors via DMA-BUF file descriptors without an intermediate memory copy. The backend renders on the CPU via pixman (like the image backend) but allocates its buffer through GBM with a linear modifier, making it suitable for zero-copy handoff to GPU-based compositors such as Mutter/Clutter (GNOME) or GSK (GTK 4). New public API (cairo-gbm.h): - cairo_gbm_surface_create() — allocate a new GBM-backed surface - cairo_gbm_surface_create_for_bo() — wrap an existing gbm_bo - cairo_gbm_surface_get_bo() — retrieve the underlying gbm_bo - cairo_gbm_surface_get_dma_buf_fd() — export a DMA-BUF fd for the buffer Build integration: - New 'gbm' meson option (auto-detected via libgbm + libdrm) - CAIRO_HAS_GBM_SURFACE feature flag Test coverage: - Dedicated API + error-path tests (test/gbm-surface.c) - Surface-as-source pattern test (test/gbm-surface-source.c) - GBM boilerplate target for the full test suite - Entries in api-special-cases.c and error-setters.c
74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
/*
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* Copyright © 2026 Red Hat, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of
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* Red Hat, Inc. not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. Red Hat, Inc. makes no representations about the
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* suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Alberto Ruiz <aruiz@redhat.com>
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*/
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#include "cairo-test.h"
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#include <cairo-gbm.h>
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#include <gbm.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "surface-source.c"
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static cairo_surface_t *
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create_source_surface (int size)
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{
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#if CAIRO_HAS_GBM_SURFACE
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int fd;
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struct gbm_device *dev;
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cairo_surface_t *surface;
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fd = open ("/dev/dri/renderD128", O_RDWR);
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if (fd < 0)
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return NULL;
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dev = gbm_create_device (fd);
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if (dev == NULL) {
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close (fd);
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return NULL;
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}
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surface = cairo_gbm_surface_create (dev, CAIRO_FORMAT_ARGB32, size, size);
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if (cairo_surface_status (surface)) {
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cairo_surface_destroy (surface);
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gbm_device_destroy (dev);
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close (fd);
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return NULL;
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}
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return surface;
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#else
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return NULL;
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#endif
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}
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CAIRO_TEST (gbm_surface_source,
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"Test using a GBM surface as the source",
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"source, gbm", /* keywords */
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NULL, /* requirements */
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SIZE, SIZE,
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preamble, draw)
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