1 // SPDX-License-Identifier: GPL-2.0 or MIT
3 * Copyright (C) 2016 Noralf Trønnes
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
12 #include <linux/iosys-map.h>
13 #include <linux/module.h>
14 #include <linux/slab.h>
16 #include <drm/drm_device.h>
17 #include <drm/drm_format_helper.h>
18 #include <drm/drm_framebuffer.h>
19 #include <drm/drm_fourcc.h>
20 #include <drm/drm_print.h>
21 #include <drm/drm_rect.h>
23 static unsigned int clip_offset(const struct drm_rect *clip, unsigned int pitch, unsigned int cpp)
25 return clip->y1 * pitch + clip->x1 * cpp;
29 * drm_fb_clip_offset - Returns the clipping rectangles byte-offset in a framebuffer
30 * @pitch: Framebuffer line pitch in byte
31 * @format: Framebuffer format
32 * @clip: Clip rectangle
35 * The byte offset of the clip rectangle's top-left corner within the framebuffer.
37 unsigned int drm_fb_clip_offset(unsigned int pitch, const struct drm_format_info *format,
38 const struct drm_rect *clip)
40 return clip_offset(clip, pitch, format->cpp[0]);
42 EXPORT_SYMBOL(drm_fb_clip_offset);
44 /* TODO: Make this function work with multi-plane formats. */
45 static int __drm_fb_xfrm(void *dst, unsigned long dst_pitch, unsigned long dst_pixsize,
46 const void *vaddr, const struct drm_framebuffer *fb,
47 const struct drm_rect *clip, bool vaddr_cached_hint,
48 void (*xfrm_line)(void *dbuf, const void *sbuf, unsigned int npixels))
50 unsigned long linepixels = drm_rect_width(clip);
51 unsigned long lines = drm_rect_height(clip);
52 size_t sbuf_len = linepixels * fb->format->cpp[0];
58 * Some source buffers, such as DMA memory, use write-combine
59 * caching, so reads are uncached. Speed up access by fetching
62 if (!vaddr_cached_hint) {
63 stmp = kmalloc(sbuf_len, GFP_KERNEL);
69 dst_pitch = drm_rect_width(clip) * dst_pixsize;
70 vaddr += clip_offset(clip, fb->pitches[0], fb->format->cpp[0]);
72 for (i = 0; i < lines; ++i) {
74 sbuf = memcpy(stmp, vaddr, sbuf_len);
77 xfrm_line(dst, sbuf, linepixels);
78 vaddr += fb->pitches[0];
87 /* TODO: Make this function work with multi-plane formats. */
88 static int __drm_fb_xfrm_toio(void __iomem *dst, unsigned long dst_pitch, unsigned long dst_pixsize,
89 const void *vaddr, const struct drm_framebuffer *fb,
90 const struct drm_rect *clip, bool vaddr_cached_hint,
91 void (*xfrm_line)(void *dbuf, const void *sbuf, unsigned int npixels))
93 unsigned long linepixels = drm_rect_width(clip);
94 unsigned long lines = drm_rect_height(clip);
95 size_t dbuf_len = linepixels * dst_pixsize;
96 size_t stmp_off = round_up(dbuf_len, ARCH_KMALLOC_MINALIGN); /* for sbuf alignment */
97 size_t sbuf_len = linepixels * fb->format->cpp[0];
103 if (vaddr_cached_hint) {
104 dbuf = kmalloc(dbuf_len, GFP_KERNEL);
106 dbuf = kmalloc(stmp_off + sbuf_len, GFP_KERNEL);
107 stmp = dbuf + stmp_off;
113 dst_pitch = linepixels * dst_pixsize;
114 vaddr += clip_offset(clip, fb->pitches[0], fb->format->cpp[0]);
116 for (i = 0; i < lines; ++i) {
118 sbuf = memcpy(stmp, vaddr, sbuf_len);
121 xfrm_line(dbuf, sbuf, linepixels);
122 memcpy_toio(dst, dbuf, dbuf_len);
123 vaddr += fb->pitches[0];
132 /* TODO: Make this function work with multi-plane formats. */
133 static int drm_fb_xfrm(struct iosys_map *dst,
134 const unsigned int *dst_pitch, const u8 *dst_pixsize,
135 const struct iosys_map *src, const struct drm_framebuffer *fb,
136 const struct drm_rect *clip, bool vaddr_cached_hint,
137 void (*xfrm_line)(void *dbuf, const void *sbuf, unsigned int npixels))
139 static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
144 dst_pitch = default_dst_pitch;
146 /* TODO: handle src in I/O memory here */
148 return __drm_fb_xfrm_toio(dst[0].vaddr_iomem, dst_pitch[0], dst_pixsize[0],
149 src[0].vaddr, fb, clip, vaddr_cached_hint, xfrm_line);
151 return __drm_fb_xfrm(dst[0].vaddr, dst_pitch[0], dst_pixsize[0],
152 src[0].vaddr, fb, clip, vaddr_cached_hint, xfrm_line);
156 * drm_fb_memcpy - Copy clip buffer
157 * @dst: Array of destination buffers
158 * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
159 * within @dst; can be NULL if scanlines are stored next to each other.
160 * @src: Array of source buffers
161 * @fb: DRM framebuffer
162 * @clip: Clip rectangle area to copy
164 * This function copies parts of a framebuffer to display memory. Destination and
165 * framebuffer formats must match. No conversion takes place. The parameters @dst,
166 * @dst_pitch and @src refer to arrays. Each array must have at least as many entries
167 * as there are planes in @fb's format. Each entry stores the value for the format's
168 * respective color plane at the same index.
170 * This function does not apply clipping on @dst (i.e. the destination is at the
173 void drm_fb_memcpy(struct iosys_map *dst, const unsigned int *dst_pitch,
174 const struct iosys_map *src, const struct drm_framebuffer *fb,
175 const struct drm_rect *clip)
177 static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
181 const struct drm_format_info *format = fb->format;
182 unsigned int i, y, lines = drm_rect_height(clip);
185 dst_pitch = default_dst_pitch;
187 for (i = 0; i < format->num_planes; ++i) {
188 unsigned int bpp_i = drm_format_info_bpp(format, i);
189 unsigned int cpp_i = DIV_ROUND_UP(bpp_i, 8);
190 size_t len_i = DIV_ROUND_UP(drm_rect_width(clip) * bpp_i, 8);
191 unsigned int dst_pitch_i = dst_pitch[i];
192 struct iosys_map dst_i = dst[i];
193 struct iosys_map src_i = src[i];
198 iosys_map_incr(&src_i, clip_offset(clip, fb->pitches[i], cpp_i));
199 for (y = 0; y < lines; y++) {
200 /* TODO: handle src_i in I/O memory here */
201 iosys_map_memcpy_to(&dst_i, 0, src_i.vaddr, len_i);
202 iosys_map_incr(&src_i, fb->pitches[i]);
203 iosys_map_incr(&dst_i, dst_pitch_i);
207 EXPORT_SYMBOL(drm_fb_memcpy);
209 static void drm_fb_swab16_line(void *dbuf, const void *sbuf, unsigned int pixels)
212 const u16 *sbuf16 = sbuf;
213 const u16 *send16 = sbuf16 + pixels;
215 while (sbuf16 < send16)
216 *dbuf16++ = swab16(*sbuf16++);
219 static void drm_fb_swab32_line(void *dbuf, const void *sbuf, unsigned int pixels)
222 const u32 *sbuf32 = sbuf;
223 const u32 *send32 = sbuf32 + pixels;
225 while (sbuf32 < send32)
226 *dbuf32++ = swab32(*sbuf32++);
230 * drm_fb_swab - Swap bytes into clip buffer
231 * @dst: Array of destination buffers
232 * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
233 * within @dst; can be NULL if scanlines are stored next to each other.
234 * @src: Array of source buffers
235 * @fb: DRM framebuffer
236 * @clip: Clip rectangle area to copy
237 * @cached: Source buffer is mapped cached (eg. not write-combined)
239 * This function copies parts of a framebuffer to display memory and swaps per-pixel
240 * bytes during the process. Destination and framebuffer formats must match. The
241 * parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
242 * least as many entries as there are planes in @fb's format. Each entry stores the
243 * value for the format's respective color plane at the same index. If @cached is
244 * false a temporary buffer is used to cache one pixel line at a time to speed up
245 * slow uncached reads.
247 * This function does not apply clipping on @dst (i.e. the destination is at the
250 void drm_fb_swab(struct iosys_map *dst, const unsigned int *dst_pitch,
251 const struct iosys_map *src, const struct drm_framebuffer *fb,
252 const struct drm_rect *clip, bool cached)
254 const struct drm_format_info *format = fb->format;
255 u8 cpp = DIV_ROUND_UP(drm_format_info_bpp(format, 0), 8);
256 void (*swab_line)(void *dbuf, const void *sbuf, unsigned int npixels);
260 swab_line = drm_fb_swab32_line;
263 swab_line = drm_fb_swab16_line;
266 drm_warn_once(fb->dev, "Format %p4cc has unsupported pixel size.\n",
271 drm_fb_xfrm(dst, dst_pitch, &cpp, src, fb, clip, cached, swab_line);
273 EXPORT_SYMBOL(drm_fb_swab);
275 static void drm_fb_xrgb8888_to_rgb332_line(void *dbuf, const void *sbuf, unsigned int pixels)
278 const __le32 *sbuf32 = sbuf;
282 for (x = 0; x < pixels; x++) {
283 pix = le32_to_cpu(sbuf32[x]);
284 dbuf8[x] = ((pix & 0x00e00000) >> 16) |
285 ((pix & 0x0000e000) >> 11) |
286 ((pix & 0x000000c0) >> 6);
291 * drm_fb_xrgb8888_to_rgb332 - Convert XRGB8888 to RGB332 clip buffer
292 * @dst: Array of RGB332 destination buffers
293 * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
294 * within @dst; can be NULL if scanlines are stored next to each other.
295 * @src: Array of XRGB8888 source buffers
296 * @fb: DRM framebuffer
297 * @clip: Clip rectangle area to copy
299 * This function copies parts of a framebuffer to display memory and converts the
300 * color format during the process. Destination and framebuffer formats must match. The
301 * parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
302 * least as many entries as there are planes in @fb's format. Each entry stores the
303 * value for the format's respective color plane at the same index.
305 * This function does not apply clipping on @dst (i.e. the destination is at the
308 * Drivers can use this function for RGB332 devices that don't support XRGB8888 natively.
310 void drm_fb_xrgb8888_to_rgb332(struct iosys_map *dst, const unsigned int *dst_pitch,
311 const struct iosys_map *src, const struct drm_framebuffer *fb,
312 const struct drm_rect *clip)
314 static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
318 drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false,
319 drm_fb_xrgb8888_to_rgb332_line);
321 EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb332);
323 static void drm_fb_xrgb8888_to_rgb565_line(void *dbuf, const void *sbuf, unsigned int pixels)
326 const __le32 *sbuf32 = sbuf;
331 for (x = 0; x < pixels; x++) {
332 pix = le32_to_cpu(sbuf32[x]);
333 val16 = ((pix & 0x00F80000) >> 8) |
334 ((pix & 0x0000FC00) >> 5) |
335 ((pix & 0x000000F8) >> 3);
340 static void drm_fb_xrgb8888_to_rgb565_swab_line(void *dbuf, const void *sbuf,
344 const __le32 *sbuf32 = sbuf;
349 for (x = 0; x < pixels; x++) {
350 pix = le32_to_cpu(sbuf32[x]);
351 val16 = ((pix & 0x00F80000) >> 8) |
352 ((pix & 0x0000FC00) >> 5) |
353 ((pix & 0x000000F8) >> 3);
354 dbuf16[x] = swab16(val16);
359 * drm_fb_xrgb8888_to_rgb565 - Convert XRGB8888 to RGB565 clip buffer
360 * @dst: Array of RGB565 destination buffers
361 * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
362 * within @dst; can be NULL if scanlines are stored next to each other.
363 * @src: Array of XRGB8888 source buffer
364 * @fb: DRM framebuffer
365 * @clip: Clip rectangle area to copy
368 * This function copies parts of a framebuffer to display memory and converts the
369 * color format during the process. Destination and framebuffer formats must match. The
370 * parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
371 * least as many entries as there are planes in @fb's format. Each entry stores the
372 * value for the format's respective color plane at the same index.
374 * This function does not apply clipping on @dst (i.e. the destination is at the
377 * Drivers can use this function for RGB565 devices that don't support XRGB8888 natively.
379 void drm_fb_xrgb8888_to_rgb565(struct iosys_map *dst, const unsigned int *dst_pitch,
380 const struct iosys_map *src, const struct drm_framebuffer *fb,
381 const struct drm_rect *clip, bool swab)
383 static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
387 void (*xfrm_line)(void *dbuf, const void *sbuf, unsigned int npixels);
390 xfrm_line = drm_fb_xrgb8888_to_rgb565_swab_line;
392 xfrm_line = drm_fb_xrgb8888_to_rgb565_line;
394 drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false, xfrm_line);
396 EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);
398 static void drm_fb_xrgb8888_to_rgb888_line(void *dbuf, const void *sbuf, unsigned int pixels)
401 const __le32 *sbuf32 = sbuf;
405 for (x = 0; x < pixels; x++) {
406 pix = le32_to_cpu(sbuf32[x]);
407 *dbuf8++ = (pix & 0x000000FF) >> 0;
408 *dbuf8++ = (pix & 0x0000FF00) >> 8;
409 *dbuf8++ = (pix & 0x00FF0000) >> 16;
414 * drm_fb_xrgb8888_to_rgb888 - Convert XRGB8888 to RGB888 clip buffer
415 * @dst: Array of RGB888 destination buffers
416 * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
417 * within @dst; can be NULL if scanlines are stored next to each other.
418 * @src: Array of XRGB8888 source buffers
419 * @fb: DRM framebuffer
420 * @clip: Clip rectangle area to copy
422 * This function copies parts of a framebuffer to display memory and converts the
423 * color format during the process. Destination and framebuffer formats must match. The
424 * parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
425 * least as many entries as there are planes in @fb's format. Each entry stores the
426 * value for the format's respective color plane at the same index.
428 * This function does not apply clipping on @dst (i.e. the destination is at the
431 * Drivers can use this function for RGB888 devices that don't natively
434 void drm_fb_xrgb8888_to_rgb888(struct iosys_map *dst, const unsigned int *dst_pitch,
435 const struct iosys_map *src, const struct drm_framebuffer *fb,
436 const struct drm_rect *clip)
438 static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
442 drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false,
443 drm_fb_xrgb8888_to_rgb888_line);
445 EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888);
447 static void drm_fb_rgb565_to_xrgb8888_line(void *dbuf, const void *sbuf, unsigned int pixels)
449 __le32 *dbuf32 = dbuf;
450 const __le16 *sbuf16 = sbuf;
453 for (x = 0; x < pixels; x++) {
454 u16 val16 = le16_to_cpu(sbuf16[x]);
455 u32 val32 = ((val16 & 0xf800) << 8) |
456 ((val16 & 0x07e0) << 5) |
457 ((val16 & 0x001f) << 3);
458 val32 = 0xff000000 | val32 |
459 ((val32 >> 3) & 0x00070007) |
460 ((val32 >> 2) & 0x00000300);
461 dbuf32[x] = cpu_to_le32(val32);
465 static void drm_fb_rgb565_to_xrgb8888(struct iosys_map *dst, const unsigned int *dst_pitch,
466 const struct iosys_map *src,
467 const struct drm_framebuffer *fb,
468 const struct drm_rect *clip)
470 static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
474 drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false,
475 drm_fb_rgb565_to_xrgb8888_line);
478 static void drm_fb_rgb888_to_xrgb8888_line(void *dbuf, const void *sbuf, unsigned int pixels)
480 __le32 *dbuf32 = dbuf;
481 const u8 *sbuf8 = sbuf;
484 for (x = 0; x < pixels; x++) {
488 u32 pix = 0xff000000 | (r << 16) | (g << 8) | b;
489 dbuf32[x] = cpu_to_le32(pix);
493 static void drm_fb_rgb888_to_xrgb8888(struct iosys_map *dst, const unsigned int *dst_pitch,
494 const struct iosys_map *src,
495 const struct drm_framebuffer *fb,
496 const struct drm_rect *clip)
498 static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
502 drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false,
503 drm_fb_rgb888_to_xrgb8888_line);
506 static void drm_fb_xrgb8888_to_xrgb2101010_line(void *dbuf, const void *sbuf, unsigned int pixels)
508 __le32 *dbuf32 = dbuf;
509 const __le32 *sbuf32 = sbuf;
514 for (x = 0; x < pixels; x++) {
515 pix = le32_to_cpu(sbuf32[x]);
516 val32 = ((pix & 0x000000FF) << 2) |
517 ((pix & 0x0000FF00) << 4) |
518 ((pix & 0x00FF0000) << 6);
519 pix = val32 | ((val32 >> 8) & 0x00300C03);
520 *dbuf32++ = cpu_to_le32(pix);
525 * drm_fb_xrgb8888_to_xrgb2101010 - Convert XRGB8888 to XRGB2101010 clip buffer
526 * @dst: Array of XRGB2101010 destination buffers
527 * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
528 * within @dst; can be NULL if scanlines are stored next to each other.
529 * @src: Array of XRGB8888 source buffers
530 * @fb: DRM framebuffer
531 * @clip: Clip rectangle area to copy
533 * This function copies parts of a framebuffer to display memory and converts the
534 * color format during the process. Destination and framebuffer formats must match. The
535 * parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
536 * least as many entries as there are planes in @fb's format. Each entry stores the
537 * value for the format's respective color plane at the same index.
539 * This function does not apply clipping on @dst (i.e. the destination is at the
542 * Drivers can use this function for XRGB2101010 devices that don't support XRGB8888
545 void drm_fb_xrgb8888_to_xrgb2101010(struct iosys_map *dst, const unsigned int *dst_pitch,
546 const struct iosys_map *src, const struct drm_framebuffer *fb,
547 const struct drm_rect *clip)
549 static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
553 drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false,
554 drm_fb_xrgb8888_to_xrgb2101010_line);
557 static void drm_fb_xrgb8888_to_gray8_line(void *dbuf, const void *sbuf, unsigned int pixels)
560 const __le32 *sbuf32 = sbuf;
563 for (x = 0; x < pixels; x++) {
564 u32 pix = le32_to_cpu(sbuf32[x]);
565 u8 r = (pix & 0x00ff0000) >> 16;
566 u8 g = (pix & 0x0000ff00) >> 8;
567 u8 b = pix & 0x000000ff;
569 /* ITU BT.601: Y = 0.299 R + 0.587 G + 0.114 B */
570 *dbuf8++ = (3 * r + 6 * g + b) / 10;
575 * drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
576 * @dst: Array of 8-bit grayscale destination buffers
577 * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
578 * within @dst; can be NULL if scanlines are stored next to each other.
579 * @src: Array of XRGB8888 source buffers
580 * @fb: DRM framebuffer
581 * @clip: Clip rectangle area to copy
583 * This function copies parts of a framebuffer to display memory and converts the
584 * color format during the process. Destination and framebuffer formats must match. The
585 * parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
586 * least as many entries as there are planes in @fb's format. Each entry stores the
587 * value for the format's respective color plane at the same index.
589 * This function does not apply clipping on @dst (i.e. the destination is at the
592 * DRM doesn't have native monochrome or grayscale support. Drivers can use this
593 * function for grayscale devices that don't support XRGB8888 natively.Such
594 * drivers can announce the commonly supported XR24 format to userspace and use
595 * this function to convert to the native format. Monochrome drivers will use the
596 * most significant bit, where 1 means foreground color and 0 background color.
597 * ITU BT.601 is being used for the RGB -> luma (brightness) conversion.
599 void drm_fb_xrgb8888_to_gray8(struct iosys_map *dst, const unsigned int *dst_pitch,
600 const struct iosys_map *src, const struct drm_framebuffer *fb,
601 const struct drm_rect *clip)
603 static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
607 drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false,
608 drm_fb_xrgb8888_to_gray8_line);
610 EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);
613 * drm_fb_blit - Copy parts of a framebuffer to display memory
614 * @dst: Array of display-memory addresses to copy to
615 * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
616 * within @dst; can be NULL if scanlines are stored next to each other.
617 * @dst_format: FOURCC code of the display's color format
618 * @src: The framebuffer memory to copy from
619 * @fb: The framebuffer to copy from
620 * @clip: Clip rectangle area to copy
622 * This function copies parts of a framebuffer to display memory. If the
623 * formats of the display and the framebuffer mismatch, the blit function
624 * will attempt to convert between them during the process. The parameters @dst,
625 * @dst_pitch and @src refer to arrays. Each array must have at least as many
626 * entries as there are planes in @dst_format's format. Each entry stores the
627 * value for the format's respective color plane at the same index.
629 * This function does not apply clipping on @dst (i.e. the destination is at the
634 * -EINVAL if the color-format conversion failed, or
635 * a negative error code otherwise.
637 int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t dst_format,
638 const struct iosys_map *src, const struct drm_framebuffer *fb,
639 const struct drm_rect *clip)
641 uint32_t fb_format = fb->format->format;
643 /* treat alpha channel like filler bits */
644 if (fb_format == DRM_FORMAT_ARGB8888)
645 fb_format = DRM_FORMAT_XRGB8888;
646 if (dst_format == DRM_FORMAT_ARGB8888)
647 dst_format = DRM_FORMAT_XRGB8888;
648 if (fb_format == DRM_FORMAT_ARGB2101010)
649 fb_format = DRM_FORMAT_XRGB2101010;
650 if (dst_format == DRM_FORMAT_ARGB2101010)
651 dst_format = DRM_FORMAT_XRGB2101010;
653 if (dst_format == fb_format) {
654 drm_fb_memcpy(dst, dst_pitch, src, fb, clip);
657 } else if (dst_format == DRM_FORMAT_RGB565) {
658 if (fb_format == DRM_FORMAT_XRGB8888) {
659 drm_fb_xrgb8888_to_rgb565(dst, dst_pitch, src, fb, clip, false);
662 } else if (dst_format == DRM_FORMAT_RGB888) {
663 if (fb_format == DRM_FORMAT_XRGB8888) {
664 drm_fb_xrgb8888_to_rgb888(dst, dst_pitch, src, fb, clip);
667 } else if (dst_format == DRM_FORMAT_XRGB8888) {
668 if (fb_format == DRM_FORMAT_RGB888) {
669 drm_fb_rgb888_to_xrgb8888(dst, dst_pitch, src, fb, clip);
671 } else if (fb_format == DRM_FORMAT_RGB565) {
672 drm_fb_rgb565_to_xrgb8888(dst, dst_pitch, src, fb, clip);
675 } else if (dst_format == DRM_FORMAT_XRGB2101010) {
676 if (fb_format == DRM_FORMAT_XRGB8888) {
677 drm_fb_xrgb8888_to_xrgb2101010(dst, dst_pitch, src, fb, clip);
682 drm_warn_once(fb->dev, "No conversion helper from %p4cc to %p4cc found.\n",
683 &fb_format, &dst_format);
687 EXPORT_SYMBOL(drm_fb_blit);
689 static void drm_fb_gray8_to_mono_line(void *dbuf, const void *sbuf, unsigned int pixels)
692 const u8 *sbuf8 = sbuf;
695 unsigned int i, bits = min(pixels, 8U);
698 for (i = 0; i < bits; i++, pixels--) {
707 * drm_fb_xrgb8888_to_mono - Convert XRGB8888 to monochrome
708 * @dst: Array of monochrome destination buffers (0=black, 1=white)
709 * @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
710 * within @dst; can be NULL if scanlines are stored next to each other.
711 * @src: Array of XRGB8888 source buffers
712 * @fb: DRM framebuffer
713 * @clip: Clip rectangle area to copy
715 * This function copies parts of a framebuffer to display memory and converts the
716 * color format during the process. Destination and framebuffer formats must match. The
717 * parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
718 * least as many entries as there are planes in @fb's format. Each entry stores the
719 * value for the format's respective color plane at the same index.
721 * This function does not apply clipping on @dst (i.e. the destination is at the
722 * top-left corner). The first pixel (upper left corner of the clip rectangle) will
723 * be converted and copied to the first bit (LSB) in the first byte of the monochrome
724 * destination buffer. If the caller requires that the first pixel in a byte must
725 * be located at an x-coordinate that is a multiple of 8, then the caller must take
726 * care itself of supplying a suitable clip rectangle.
728 * DRM doesn't have native monochrome support. Drivers can use this function for
729 * monochrome devices that don't support XRGB8888 natively. Such drivers can
730 * announce the commonly supported XR24 format to userspace and use this function
731 * to convert to the native format.
733 * This function uses drm_fb_xrgb8888_to_gray8() to convert to grayscale and
734 * then the result is converted from grayscale to monochrome.
736 void drm_fb_xrgb8888_to_mono(struct iosys_map *dst, const unsigned int *dst_pitch,
737 const struct iosys_map *src, const struct drm_framebuffer *fb,
738 const struct drm_rect *clip)
740 static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
743 unsigned int linepixels = drm_rect_width(clip);
744 unsigned int lines = drm_rect_height(clip);
745 unsigned int cpp = fb->format->cpp[0];
746 unsigned int len_src32 = linepixels * cpp;
747 struct drm_device *dev = fb->dev;
748 void *vaddr = src[0].vaddr;
749 unsigned int dst_pitch_0;
751 u8 *mono = dst[0].vaddr, *gray8;
754 if (drm_WARN_ON(dev, fb->format->format != DRM_FORMAT_XRGB8888))
758 dst_pitch = default_dst_pitch;
759 dst_pitch_0 = dst_pitch[0];
762 * The mono destination buffer contains 1 bit per pixel
765 dst_pitch_0 = DIV_ROUND_UP(linepixels, 8);
768 * The dma memory is write-combined so reads are uncached.
769 * Speed up by fetching one line at a time.
771 * Also, format conversion from XR24 to monochrome are done
772 * line-by-line but are converted to 8-bit grayscale as an
775 * Allocate a buffer to be used for both copying from the cma
776 * memory and to store the intermediate grayscale line pixels.
778 src32 = kmalloc(len_src32 + linepixels, GFP_KERNEL);
782 gray8 = (u8 *)src32 + len_src32;
784 vaddr += clip_offset(clip, fb->pitches[0], cpp);
785 for (y = 0; y < lines; y++) {
786 src32 = memcpy(src32, vaddr, len_src32);
787 drm_fb_xrgb8888_to_gray8_line(gray8, src32, linepixels);
788 drm_fb_gray8_to_mono_line(mono, gray8, linepixels);
789 vaddr += fb->pitches[0];
795 EXPORT_SYMBOL(drm_fb_xrgb8888_to_mono);