Commit 900d3e4a authored by Thomas Zimmermann's avatar Thomas Zimmermann
Browse files

drm/format-helper: Add blitter functions 



The blitter functions copy a framebuffer to I/O memory using one of
the existing conversion functions.

Signed-off-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: default avatarMaxime Ripard <maxime@cerno.tech>
Tested-by: default avatarnerdopolis <bluescreen_avenger@verizon.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20210430105840.30515-3-tzimmermann@suse.de
parent 5ab7af71

drivers/gpu/drm/drm_format_helper.c

+87 −0
Original line number Diff line number Diff line
@@ -344,3 +344,90 @@ void drm_fb_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb, 
}

EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);



/**

 * drm_fb_blit_rect_dstclip - Copy parts of a framebuffer to display memory

 * @dst:	The display memory to copy to

 * @dst_pitch:	Number of bytes between two consecutive scanlines within dst

 * @dst_format:	FOURCC code of the display's color format

 * @vmap:	The framebuffer memory to copy from

 * @fb:		The framebuffer to copy from

 * @clip:	Clip rectangle area to copy

 *

 * This function copies parts of a framebuffer to display memory. If the

 * formats of the display and the framebuffer mismatch, the blit function

 * will attempt to convert between them.

 *

 * Use drm_fb_blit_dstclip() to copy the full framebuffer.

 *

 * Returns:

 * 0 on success, or

 * -EINVAL if the color-format conversion failed, or

 * a negative error code otherwise.

 */

int drm_fb_blit_rect_dstclip(void __iomem *dst, unsigned int dst_pitch,

			     uint32_t dst_format, void *vmap,

			     struct drm_framebuffer *fb,

			     struct drm_rect *clip)

{

	uint32_t fb_format = fb->format->format;



	/* treat alpha channel like filler bits */

	if (fb_format == DRM_FORMAT_ARGB8888)

		fb_format = DRM_FORMAT_XRGB8888;

	if (dst_format == DRM_FORMAT_ARGB8888)

		dst_format = DRM_FORMAT_XRGB8888;



	if (dst_format == fb_format) {

		drm_fb_memcpy_dstclip(dst, dst_pitch, vmap, fb, clip);

		return 0;



	} else if (dst_format == DRM_FORMAT_RGB565) {

		if (fb_format == DRM_FORMAT_XRGB8888) {

			drm_fb_xrgb8888_to_rgb565_dstclip(dst, dst_pitch,

							  vmap, fb, clip,

							  false);

			return 0;

		}

	} else if (dst_format == DRM_FORMAT_RGB888) {

		if (fb_format == DRM_FORMAT_XRGB8888) {

			drm_fb_xrgb8888_to_rgb888_dstclip(dst, dst_pitch,

							  vmap, fb, clip);

			return 0;

		}

	}



	return -EINVAL;

}

EXPORT_SYMBOL(drm_fb_blit_rect_dstclip);



/**

 * drm_fb_blit_dstclip - Copy framebuffer to display memory

 * @dst:	The display memory to copy to

 * @dst_pitch:	Number of bytes between two consecutive scanlines within dst

 * @dst_format:	FOURCC code of the display's color format

 * @vmap:	The framebuffer memory to copy from

 * @fb:		The framebuffer to copy from

 *

 * This function copies a full framebuffer to display memory. If the formats

 * of the display and the framebuffer mismatch, the copy function will

 * attempt to convert between them.

 *

 * See drm_fb_blit_rect_dstclip() for more inforamtion.

 *

 * Returns:

 * 0 on success, or a negative error code otherwise.

 */

int drm_fb_blit_dstclip(void __iomem *dst, unsigned int dst_pitch,

			uint32_t dst_format, void *vmap,

			struct drm_framebuffer *fb)

{

	struct drm_rect fullscreen = {

		.x1 = 0,

		.x2 = fb->width,

		.y1 = 0,

		.y2 = fb->height,

	};

	return drm_fb_blit_rect_dstclip(dst, dst_pitch, dst_format, vmap, fb,

					&fullscreen);

}

EXPORT_SYMBOL(drm_fb_blit_dstclip);

include/drm/drm_format_helper.h

+8 −0
Original line number Diff line number Diff line
@@ -28,4 +28,12 @@ void drm_fb_xrgb8888_to_rgb888_dstclip(void __iomem *dst, unsigned int dst_pitch 
void drm_fb_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,

			      struct drm_rect *clip);



int drm_fb_blit_rect_dstclip(void __iomem *dst, unsigned int dst_pitch,

			     uint32_t dst_format, void *vmap,

			     struct drm_framebuffer *fb,

			     struct drm_rect *rect);

int drm_fb_blit_dstclip(void __iomem *dst, unsigned int dst_pitch,

			uint32_t dst_format, void *vmap,

			struct drm_framebuffer *fb);



#endif /* __LINUX_DRM_FORMAT_HELPER_H */