drm: add drm_fb_xrgb8888_to_rgb888_dstclip() (ec3de7a4) · Commits · 戴 / test

drivers/gpu/drm/drm_format_helper.c

+60 −0

Original line number	Diff line number	Diff line
		@@ -210,6 +210,66 @@ void drm_fb_xrgb8888_to_rgb565_dstclip(void *dst, unsigned int dst_pitch,
		}
		EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565_dstclip);

		static void drm_fb_xrgb8888_to_rgb888_lines(void *dst, unsigned int dst_pitch,
		void *src, unsigned int src_pitch,
		unsigned int src_linelength,
		unsigned int lines)
		{
		unsigned int linepixels = src_linelength / 3;
		unsigned int x, y;
		u32 *sbuf;
		u8 *dbuf;

		sbuf = kmalloc(src_linelength, GFP_KERNEL);
		if (!sbuf)
		return;

		for (y = 0; y < lines; y++) {
		memcpy(sbuf, src, src_linelength);
		dbuf = dst;
		for (x = 0; x < linepixels; x++) {
		*dbuf++ = (sbuf[x] & 0x000000FF) >> 0;
		*dbuf++ = (sbuf[x] & 0x0000FF00) >> 8;
		*dbuf++ = (sbuf[x] & 0x00FF0000) >> 16;
		}
		src += src_pitch;
		dst += dst_pitch;
		}

		kfree(sbuf);
		}

		/**
		* drm_fb_xrgb8888_to_rgb888_dstclip - Convert XRGB8888 to RGB888 clip buffer
		* @dst: RGB565 destination buffer
		* @dst_pitch: destination buffer pitch
		* @vaddr: XRGB8888 source buffer
		* @fb: DRM framebuffer
		* @clip: Clip rectangle area to copy
		* @dstclip: Clip destination too.
		*
		* Drivers can use this function for RGB888 devices that don't natively
		* support XRGB8888.
		*
		* This function applies clipping on dst, i.e. the destination is a
		* full framebuffer but only the clip rect content is copied over.
		*/
		void drm_fb_xrgb8888_to_rgb888_dstclip(void *dst, unsigned int dst_pitch,
		void vaddr, struct drm_framebuffer fb,
		struct drm_rect *clip)
		{
		unsigned int src_offset = (clip->y1 * fb->pitches[0])
		+ (clip->x1 * sizeof(u32));
		unsigned int dst_offset = (clip->y1 * dst_pitch)
		+ (clip->x1 * 3);
		size_t src_len = (clip->x2 - clip->x1) * sizeof(u32);

		drm_fb_xrgb8888_to_rgb888_lines(dst + dst_offset, dst_pitch,
		vaddr + src_offset, fb->pitches[0],
		src_len, clip->y2 - clip->y1);
		}
		EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_dstclip);

		/**
		* drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
		* @dst: 8-bit grayscale destination buffer

include/drm/drm_format_helper.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -25,6 +25,9 @@ void drm_fb_xrgb8888_to_rgb565(void dst, void vaddr,
		void drm_fb_xrgb8888_to_rgb565_dstclip(void *dst, unsigned int dst_pitch,
		void vaddr, struct drm_framebuffer fb,
		struct drm_rect *clip, bool swap);
		void drm_fb_xrgb8888_to_rgb888_dstclip(void *dst, unsigned int dst_pitch,
		void vaddr, struct drm_framebuffer fb,
		struct drm_rect *clip);
		void drm_fb_xrgb8888_to_gray8(u8 dst, void vaddr, struct drm_framebuffer *fb,
		struct drm_rect *clip);

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