diff options
Diffstat (limited to 'drivers/gpu/drm/vkms/vkms_composer.c')
| -rw-r--r-- | drivers/gpu/drm/vkms/vkms_composer.c | 104 |
1 files changed, 72 insertions, 32 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_composer.c b/drivers/gpu/drm/vkms/vkms_composer.c index 66c6842d70db..e49523866e1d 100644 --- a/drivers/gpu/drm/vkms/vkms_composer.c +++ b/drivers/gpu/drm/vkms/vkms_composer.c @@ -4,6 +4,7 @@ #include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> +#include <drm/drm_fourcc.h> #include <drm/drm_gem_framebuffer_helper.h> #include <drm/drm_gem_shmem_helper.h> #include <drm/drm_vblank.h> @@ -64,7 +65,17 @@ static u8 blend_channel(u8 src, u8 dst, u8 alpha) return new_color; } -static void alpha_blending(const u8 *argb_src, u8 *argb_dst) +/** + * alpha_blend - alpha blending equation + * @argb_src: src pixel on premultiplied alpha mode + * @argb_dst: dst pixel completely opaque + * + * blend pixels using premultiplied blend formula. The current DRM assumption + * is that pixel color values have been already pre-multiplied with the alpha + * channel values. See more drm_plane_create_blend_mode_property(). Also, this + * formula assumes a completely opaque background. + */ +static void alpha_blend(const u8 *argb_src, u8 *argb_dst) { u8 alpha; @@ -72,8 +83,16 @@ static void alpha_blending(const u8 *argb_src, u8 *argb_dst) argb_dst[0] = blend_channel(argb_src[0], argb_dst[0], alpha); argb_dst[1] = blend_channel(argb_src[1], argb_dst[1], alpha); argb_dst[2] = blend_channel(argb_src[2], argb_dst[2], alpha); - /* Opaque primary */ - argb_dst[3] = 0xFF; +} + +/** + * x_blend - blending equation that ignores the pixel alpha + * + * overwrites RGB color value from src pixel to dst pixel. + */ +static void x_blend(const u8 *xrgb_src, u8 *xrgb_dst) +{ + memcpy(xrgb_dst, xrgb_src, sizeof(u8) * 3); } /** @@ -82,16 +101,20 @@ static void alpha_blending(const u8 *argb_src, u8 *argb_dst) * @vaddr_src: source address * @dst_composer: destination framebuffer's metadata * @src_composer: source framebuffer's metadata + * @pixel_blend: blending equation based on plane format * - * Blend the vaddr_src value with the vaddr_dst value using the pre-multiplied - * alpha blending equation, since DRM currently assumes that the pixel color - * values have already been pre-multiplied with the alpha channel values. See - * more drm_plane_create_blend_mode_property(). This function uses buffer's - * metadata to locate the new composite values at vaddr_dst. + * Blend the vaddr_src value with the vaddr_dst value using a pixel blend + * equation according to the supported plane formats DRM_FORMAT_(A/XRGB8888) + * and clearing alpha channel to an completely opaque background. This function + * uses buffer's metadata to locate the new composite values at vaddr_dst. + * + * TODO: completely clear the primary plane (a = 0xff) before starting to blend + * pixel color values */ static void blend(void *vaddr_dst, void *vaddr_src, struct vkms_composer *dst_composer, - struct vkms_composer *src_composer) + struct vkms_composer *src_composer, + void (*pixel_blend)(const u8 *, u8 *)) { int i, j, j_dst, i_dst; int offset_src, offset_dst; @@ -119,36 +142,46 @@ static void blend(void *vaddr_dst, void *vaddr_src, pixel_src = (u8 *)(vaddr_src + offset_src); pixel_dst = (u8 *)(vaddr_dst + offset_dst); - alpha_blending(pixel_src, pixel_dst); + pixel_blend(pixel_src, pixel_dst); + /* clearing alpha channel (0xff)*/ + pixel_dst[3] = 0xff; } i_dst++; } } -static void compose_cursor(struct vkms_composer *cursor_composer, - struct vkms_composer *primary_composer, - void *vaddr_out) +static void compose_plane(struct vkms_composer *primary_composer, + struct vkms_composer *plane_composer, + void *vaddr_out) { - struct drm_gem_object *cursor_obj; - struct drm_gem_shmem_object *cursor_shmem_obj; + struct drm_gem_object *plane_obj; + struct drm_gem_shmem_object *plane_shmem_obj; + struct drm_framebuffer *fb = &plane_composer->fb; + void (*pixel_blend)(const u8 *p_src, u8 *p_dst); - cursor_obj = drm_gem_fb_get_obj(&cursor_composer->fb, 0); - cursor_shmem_obj = to_drm_gem_shmem_obj(cursor_obj); + plane_obj = drm_gem_fb_get_obj(&plane_composer->fb, 0); + plane_shmem_obj = to_drm_gem_shmem_obj(plane_obj); - if (WARN_ON(!cursor_shmem_obj->vaddr)) + if (WARN_ON(!plane_shmem_obj->vaddr)) return; - blend(vaddr_out, cursor_shmem_obj->vaddr, - primary_composer, cursor_composer); + if (fb->format->format == DRM_FORMAT_ARGB8888) + pixel_blend = &alpha_blend; + else + pixel_blend = &x_blend; + + blend(vaddr_out, plane_shmem_obj->vaddr, primary_composer, + plane_composer, pixel_blend); } -static int compose_planes(void **vaddr_out, - struct vkms_composer *primary_composer, - struct vkms_composer *cursor_composer) +static int compose_active_planes(void **vaddr_out, + struct vkms_composer *primary_composer, + struct vkms_crtc_state *crtc_state) { struct drm_framebuffer *fb = &primary_composer->fb; struct drm_gem_object *gem_obj = drm_gem_fb_get_obj(fb, 0); struct drm_gem_shmem_object *shmem_obj = to_drm_gem_shmem_obj(gem_obj); + int i; if (!*vaddr_out) { *vaddr_out = kzalloc(shmem_obj->base.size, GFP_KERNEL); @@ -163,8 +196,14 @@ static int compose_planes(void **vaddr_out, memcpy(*vaddr_out, shmem_obj->vaddr, shmem_obj->base.size); - if (cursor_composer) - compose_cursor(cursor_composer, primary_composer, *vaddr_out); + /* If there are other planes besides primary, we consider the active + * planes should be in z-order and compose them associatively: + * ((primary <- overlay) <- cursor) + */ + for (i = 1; i < crtc_state->num_active_planes; i++) + compose_plane(primary_composer, + crtc_state->active_planes[i]->composer, + *vaddr_out); return 0; } @@ -186,7 +225,7 @@ void vkms_composer_worker(struct work_struct *work) struct drm_crtc *crtc = crtc_state->base.crtc; struct vkms_output *out = drm_crtc_to_vkms_output(crtc); struct vkms_composer *primary_composer = NULL; - struct vkms_composer *cursor_composer = NULL; + struct vkms_plane_state *act_plane = NULL; bool crc_pending, wb_pending; void *vaddr_out = NULL; u32 crc32 = 0; @@ -210,11 +249,11 @@ void vkms_composer_worker(struct work_struct *work) if (!crc_pending) return; - if (crtc_state->num_active_planes >= 1) - primary_composer = crtc_state->active_planes[0]->composer; - - if (crtc_state->num_active_planes == 2) - cursor_composer = crtc_state->active_planes[1]->composer; + if (crtc_state->num_active_planes >= 1) { + act_plane = crtc_state->active_planes[0]; + if (act_plane->base.plane->type == DRM_PLANE_TYPE_PRIMARY) + primary_composer = act_plane->composer; + } if (!primary_composer) return; @@ -222,7 +261,8 @@ void vkms_composer_worker(struct work_struct *work) if (wb_pending) vaddr_out = crtc_state->active_writeback; - ret = compose_planes(&vaddr_out, primary_composer, cursor_composer); + ret = compose_active_planes(&vaddr_out, primary_composer, + crtc_state); if (ret) { if (ret == -EINVAL && !wb_pending) kfree(vaddr_out); |