cogl/scanout: Allow blitting to framebuffer
This will be used when screencasting monitors so that if there's scanout in place, it'll still be possible to blit it to a PipeWire-owned framebuffer, and stream it. Add a new 'blit_to_framebuffer' vfunc to CoglScanout, and implement it in MetaDrmBufferGbm. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1421
This commit is contained in:
Georges Basile Stavracas Neto
parent
661fe7769d
commit
21a21e7f68
@ -25,3 +25,22 @@ static void
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cogl_scanout_default_init (CoglScanoutInterface *iface)
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{
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}
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gboolean
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cogl_scanout_blit_to_framebuffer (CoglScanout *scanout,
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CoglFramebuffer *framebuffer,
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int x,
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int y,
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GError **error)
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{
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CoglScanoutInterface *iface;
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g_return_val_if_fail (COGL_IS_SCANOUT (scanout), FALSE);
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iface = COGL_SCANOUT_GET_IFACE (scanout);
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if (iface->blit_to_framebuffer)
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return iface->blit_to_framebuffer (scanout, framebuffer, x, y, error);
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else
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return FALSE;
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}
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@ -19,6 +19,7 @@
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#define COGL_SCANOUT_H
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#include "cogl/cogl-types.h"
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#include "cogl/cogl-framebuffer.h"
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#include <glib-object.h>
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@ -30,6 +31,19 @@ G_DECLARE_INTERFACE (CoglScanout, cogl_scanout,
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struct _CoglScanoutInterface
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{
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GTypeInterface parent_iface;
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gboolean (*blit_to_framebuffer) (CoglScanout *scanout,
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CoglFramebuffer *framebuffer,
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int x,
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int y,
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GError **error);
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};
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COGL_EXPORT
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gboolean cogl_scanout_blit_to_framebuffer (CoglScanout *scanout,
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CoglFramebuffer *framebuffer,
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int x,
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int y,
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GError **error);
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#endif /* COGL_SCANOUT_H */
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@ -23,6 +23,7 @@
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#include "config.h"
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#include "backends/native/meta-cogl-utils.h"
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#include "backends/native/meta-drm-buffer-gbm.h"
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#include <drm_fourcc.h>
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@ -166,9 +167,140 @@ meta_drm_buffer_gbm_get_fb_id (MetaDrmBuffer *buffer)
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return META_DRM_BUFFER_GBM (buffer)->fb_id;
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}
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static gboolean
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meta_drm_buffer_gbm_blit_to_framebuffer (CoglScanout *scanout,
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CoglFramebuffer *framebuffer,
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int x,
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int y,
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GError **error)
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{
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MetaDrmBufferGbm *buffer_gbm = META_DRM_BUFFER_GBM (scanout);
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MetaBackend *backend = meta_get_backend ();
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MetaEgl *egl = meta_backend_get_egl (backend);
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ClutterBackend *clutter_backend =
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meta_backend_get_clutter_backend (backend);
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CoglContext *cogl_context =
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clutter_backend_get_cogl_context (clutter_backend);
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CoglDisplay *cogl_display = cogl_context->display;
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CoglRenderer *cogl_renderer = cogl_display->renderer;
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CoglRendererEGL *cogl_renderer_egl = cogl_renderer->winsys;
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EGLDisplay egl_display = cogl_renderer_egl->edpy;
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EGLImageKHR egl_image;
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CoglPixelFormat cogl_format;
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CoglEglImageFlags flags;
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CoglOffscreen *cogl_fbo = NULL;
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CoglTexture2D *cogl_tex;
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uint32_t n_planes;
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uint64_t *modifiers;
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uint32_t *strides;
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uint32_t *offsets;
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uint32_t width;
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uint32_t height;
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uint32_t drm_format;
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int *fds;
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gboolean result;
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int dmabuf_fd = -1;
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uint32_t i;
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if (!buffer_gbm->bo)
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{
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_NOT_FOUND,
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"No gbm_bo available");
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return FALSE;
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}
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dmabuf_fd = gbm_bo_get_fd (buffer_gbm->bo);
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if (dmabuf_fd == -1)
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{
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g_set_error (error, G_IO_ERROR, G_IO_ERROR_EXISTS,
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"Failed to export buffer's DMA fd: %s",
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g_strerror (errno));
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return FALSE;
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}
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drm_format = gbm_bo_get_format (buffer_gbm->bo);
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result = meta_cogl_pixel_format_from_drm_format (drm_format,
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&cogl_format,
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NULL);
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g_assert (result);
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width = gbm_bo_get_width (buffer_gbm->bo);
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height = gbm_bo_get_height (buffer_gbm->bo);
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n_planes = gbm_bo_get_plane_count (buffer_gbm->bo);
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fds = g_alloca (sizeof (int) * n_planes);
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strides = g_alloca (sizeof (uint32_t) * n_planes);
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offsets = g_alloca (sizeof (uint32_t) * n_planes);
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modifiers = g_alloca (sizeof (uint64_t) * n_planes);
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for (i = 0; i < n_planes; i++)
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{
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fds[i] = dmabuf_fd;
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strides[i] = gbm_bo_get_stride_for_plane (buffer_gbm->bo, i);
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offsets[i] = gbm_bo_get_offset (buffer_gbm->bo, i);
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modifiers[i] = gbm_bo_get_modifier (buffer_gbm->bo);
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}
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egl_image = meta_egl_create_dmabuf_image (egl,
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egl_display,
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width,
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height,
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drm_format,
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n_planes,
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fds,
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strides,
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offsets,
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modifiers,
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error);
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if (egl_image == EGL_NO_IMAGE_KHR)
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{
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result = FALSE;
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goto out;
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}
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flags = COGL_EGL_IMAGE_FLAG_NO_GET_DATA;
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cogl_tex = cogl_egl_texture_2d_new_from_image (cogl_context,
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width,
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height,
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cogl_format,
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egl_image,
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flags,
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error);
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meta_egl_destroy_image (egl, egl_display, egl_image, NULL);
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if (!cogl_tex)
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{
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result = FALSE;
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goto out;
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}
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cogl_fbo = cogl_offscreen_new_with_texture (COGL_TEXTURE (cogl_tex));
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cogl_object_unref (cogl_tex);
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if (!cogl_framebuffer_allocate (COGL_FRAMEBUFFER (cogl_fbo), error))
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{
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result = FALSE;
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goto out;
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}
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result = cogl_blit_framebuffer (COGL_FRAMEBUFFER (cogl_fbo),
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framebuffer,
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0, 0,
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x, y,
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width, height,
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error);
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out:
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cogl_clear_object (&cogl_fbo);
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close (dmabuf_fd);
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return result;
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}
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static void
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cogl_scanout_iface_init (CoglScanoutInterface *iface)
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{
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iface->blit_to_framebuffer = meta_drm_buffer_gbm_blit_to_framebuffer;
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}
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static void
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