Staging
v0.7.0
v0.7.0
drm_format_helper.c
// SPDX-License-Identifier: GPL-2.0 or MIT
/*
* Copyright (C) 2016 Noralf Trønnes
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/io.h>
#include <linux/iosys-map.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <drm/drm_device.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_print.h>
#include <drm/drm_rect.h>
static unsigned int clip_offset(const struct drm_rect *clip, unsigned int pitch, unsigned int cpp)
{
return clip->y1 * pitch + clip->x1 * cpp;
}
/**
* drm_fb_clip_offset - Returns the clipping rectangles byte-offset in a framebuffer
* @pitch: Framebuffer line pitch in byte
* @format: Framebuffer format
* @clip: Clip rectangle
*
* Returns:
* The byte offset of the clip rectangle's top-left corner within the framebuffer.
*/
unsigned int drm_fb_clip_offset(unsigned int pitch, const struct drm_format_info *format,
const struct drm_rect *clip)
{
return clip_offset(clip, pitch, format->cpp[0]);
}
EXPORT_SYMBOL(drm_fb_clip_offset);
/* TODO: Make this function work with multi-plane formats. */
static int __drm_fb_xfrm(void *dst, unsigned long dst_pitch, unsigned long dst_pixsize,
const void *vaddr, const struct drm_framebuffer *fb,
const struct drm_rect *clip, bool vaddr_cached_hint,
void (*xfrm_line)(void *dbuf, const void *sbuf, unsigned int npixels))
{
unsigned long linepixels = drm_rect_width(clip);
unsigned long lines = drm_rect_height(clip);
size_t sbuf_len = linepixels * fb->format->cpp[0];
void *stmp = NULL;
unsigned long i;
const void *sbuf;
/*
* Some source buffers, such as DMA memory, use write-combine
* caching, so reads are uncached. Speed up access by fetching
* one line at a time.
*/
if (!vaddr_cached_hint) {
stmp = kmalloc(sbuf_len, GFP_KERNEL);
if (!stmp)
return -ENOMEM;
}
if (!dst_pitch)
dst_pitch = drm_rect_width(clip) * dst_pixsize;
vaddr += clip_offset(clip, fb->pitches[0], fb->format->cpp[0]);
for (i = 0; i < lines; ++i) {
if (stmp)
sbuf = memcpy(stmp, vaddr, sbuf_len);
else
sbuf = vaddr;
xfrm_line(dst, sbuf, linepixels);
vaddr += fb->pitches[0];
dst += dst_pitch;
}
kfree(stmp);
return 0;
}
/* TODO: Make this function work with multi-plane formats. */
static int __drm_fb_xfrm_toio(void __iomem *dst, unsigned long dst_pitch, unsigned long dst_pixsize,
const void *vaddr, const struct drm_framebuffer *fb,
const struct drm_rect *clip, bool vaddr_cached_hint,
void (*xfrm_line)(void *dbuf, const void *sbuf, unsigned int npixels))
{
unsigned long linepixels = drm_rect_width(clip);
unsigned long lines = drm_rect_height(clip);
size_t dbuf_len = linepixels * dst_pixsize;
size_t stmp_off = round_up(dbuf_len, ARCH_KMALLOC_MINALIGN); /* for sbuf alignment */
size_t sbuf_len = linepixels * fb->format->cpp[0];
void *stmp = NULL;
unsigned long i;
const void *sbuf;
void *dbuf;
if (vaddr_cached_hint) {
dbuf = kmalloc(dbuf_len, GFP_KERNEL);
} else {
dbuf = kmalloc(stmp_off + sbuf_len, GFP_KERNEL);
stmp = dbuf + stmp_off;
}
if (!dbuf)
return -ENOMEM;
if (!dst_pitch)
dst_pitch = linepixels * dst_pixsize;
vaddr += clip_offset(clip, fb->pitches[0], fb->format->cpp[0]);
for (i = 0; i < lines; ++i) {
if (stmp)
sbuf = memcpy(stmp, vaddr, sbuf_len);
else
sbuf = vaddr;
xfrm_line(dbuf, sbuf, linepixels);
memcpy_toio(dst, dbuf, dbuf_len);
vaddr += fb->pitches[0];
dst += dst_pitch;
}
kfree(dbuf);
return 0;
}
/* TODO: Make this function work with multi-plane formats. */
static int drm_fb_xfrm(struct iosys_map *dst,
const unsigned int *dst_pitch, const u8 *dst_pixsize,
const struct iosys_map *src, const struct drm_framebuffer *fb,
const struct drm_rect *clip, bool vaddr_cached_hint,
void (*xfrm_line)(void *dbuf, const void *sbuf, unsigned int npixels))
{
static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
0, 0, 0, 0
};
if (!dst_pitch)
dst_pitch = default_dst_pitch;
/* TODO: handle src in I/O memory here */
if (dst[0].is_iomem)
return __drm_fb_xfrm_toio(dst[0].vaddr_iomem, dst_pitch[0], dst_pixsize[0],
src[0].vaddr, fb, clip, vaddr_cached_hint, xfrm_line);
else
return __drm_fb_xfrm(dst[0].vaddr, dst_pitch[0], dst_pixsize[0],
src[0].vaddr, fb, clip, vaddr_cached_hint, xfrm_line);
}
/**
* drm_fb_memcpy - Copy clip buffer
* @dst: Array of destination buffers
* @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
* within @dst; can be NULL if scanlines are stored next to each other.
* @src: Array of source buffers
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* This function copies parts of a framebuffer to display memory. Destination and
* framebuffer formats must match. No conversion takes place. The parameters @dst,
* @dst_pitch and @src refer to arrays. Each array must have at least as many entries
* as there are planes in @fb's format. Each entry stores the value for the format's
* respective color plane at the same index.
*
* This function does not apply clipping on @dst (i.e. the destination is at the
* top-left corner).
*/
void drm_fb_memcpy(struct iosys_map *dst, const unsigned int *dst_pitch,
const struct iosys_map *src, const struct drm_framebuffer *fb,
const struct drm_rect *clip)
{
static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
0, 0, 0, 0
};
const struct drm_format_info *format = fb->format;
unsigned int i, y, lines = drm_rect_height(clip);
if (!dst_pitch)
dst_pitch = default_dst_pitch;
for (i = 0; i < format->num_planes; ++i) {
unsigned int bpp_i = drm_format_info_bpp(format, i);
unsigned int cpp_i = DIV_ROUND_UP(bpp_i, 8);
size_t len_i = DIV_ROUND_UP(drm_rect_width(clip) * bpp_i, 8);
unsigned int dst_pitch_i = dst_pitch[i];
struct iosys_map dst_i = dst[i];
struct iosys_map src_i = src[i];
if (!dst_pitch_i)
dst_pitch_i = len_i;
iosys_map_incr(&src_i, clip_offset(clip, fb->pitches[i], cpp_i));
for (y = 0; y < lines; y++) {
/* TODO: handle src_i in I/O memory here */
iosys_map_memcpy_to(&dst_i, 0, src_i.vaddr, len_i);
iosys_map_incr(&src_i, fb->pitches[i]);
iosys_map_incr(&dst_i, dst_pitch_i);
}
}
}
EXPORT_SYMBOL(drm_fb_memcpy);
static void drm_fb_swab16_line(void *dbuf, const void *sbuf, unsigned int pixels)
{
u16 *dbuf16 = dbuf;
const u16 *sbuf16 = sbuf;
const u16 *send16 = sbuf16 + pixels;
while (sbuf16 < send16)
*dbuf16++ = swab16(*sbuf16++);
}
static void drm_fb_swab32_line(void *dbuf, const void *sbuf, unsigned int pixels)
{
u32 *dbuf32 = dbuf;
const u32 *sbuf32 = sbuf;
const u32 *send32 = sbuf32 + pixels;
while (sbuf32 < send32)
*dbuf32++ = swab32(*sbuf32++);
}
/**
* drm_fb_swab - Swap bytes into clip buffer
* @dst: Array of destination buffers
* @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
* within @dst; can be NULL if scanlines are stored next to each other.
* @src: Array of source buffers
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
* @cached: Source buffer is mapped cached (eg. not write-combined)
*
* This function copies parts of a framebuffer to display memory and swaps per-pixel
* bytes during the process. Destination and framebuffer formats must match. The
* parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
* least as many entries as there are planes in @fb's format. Each entry stores the
* value for the format's respective color plane at the same index. If @cached is
* false a temporary buffer is used to cache one pixel line at a time to speed up
* slow uncached reads.
*
* This function does not apply clipping on @dst (i.e. the destination is at the
* top-left corner).
*/
void drm_fb_swab(struct iosys_map *dst, const unsigned int *dst_pitch,
const struct iosys_map *src, const struct drm_framebuffer *fb,
const struct drm_rect *clip, bool cached)
{
const struct drm_format_info *format = fb->format;
u8 cpp = DIV_ROUND_UP(drm_format_info_bpp(format, 0), 8);
void (*swab_line)(void *dbuf, const void *sbuf, unsigned int npixels);
switch (cpp) {
case 4:
swab_line = drm_fb_swab32_line;
break;
case 2:
swab_line = drm_fb_swab16_line;
break;
default:
drm_warn_once(fb->dev, "Format %p4cc has unsupported pixel size.\n",
&format->format);
return;
}
drm_fb_xfrm(dst, dst_pitch, &cpp, src, fb, clip, cached, swab_line);
}
EXPORT_SYMBOL(drm_fb_swab);
static void drm_fb_xrgb8888_to_rgb332_line(void *dbuf, const void *sbuf, unsigned int pixels)
{
u8 *dbuf8 = dbuf;
const __le32 *sbuf32 = sbuf;
unsigned int x;
u32 pix;
for (x = 0; x < pixels; x++) {
pix = le32_to_cpu(sbuf32[x]);
dbuf8[x] = ((pix & 0x00e00000) >> 16) |
((pix & 0x0000e000) >> 11) |
((pix & 0x000000c0) >> 6);
}
}
/**
* drm_fb_xrgb8888_to_rgb332 - Convert XRGB8888 to RGB332 clip buffer
* @dst: Array of RGB332 destination buffers
* @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
* within @dst; can be NULL if scanlines are stored next to each other.
* @src: Array of XRGB8888 source buffers
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* This function copies parts of a framebuffer to display memory and converts the
* color format during the process. Destination and framebuffer formats must match. The
* parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
* least as many entries as there are planes in @fb's format. Each entry stores the
* value for the format's respective color plane at the same index.
*
* This function does not apply clipping on @dst (i.e. the destination is at the
* top-left corner).
*
* Drivers can use this function for RGB332 devices that don't support XRGB8888 natively.
*/
void drm_fb_xrgb8888_to_rgb332(struct iosys_map *dst, const unsigned int *dst_pitch,
const struct iosys_map *src, const struct drm_framebuffer *fb,
const struct drm_rect *clip)
{
static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
1,
};
drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false,
drm_fb_xrgb8888_to_rgb332_line);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb332);
static void drm_fb_xrgb8888_to_rgb565_line(void *dbuf, const void *sbuf, unsigned int pixels)
{
u16 *dbuf16 = dbuf;
const __le32 *sbuf32 = sbuf;
unsigned int x;
u16 val16;
u32 pix;
for (x = 0; x < pixels; x++) {
pix = le32_to_cpu(sbuf32[x]);
val16 = ((pix & 0x00F80000) >> 8) |
((pix & 0x0000FC00) >> 5) |
((pix & 0x000000F8) >> 3);
dbuf16[x] = val16;
}
}
static void drm_fb_xrgb8888_to_rgb565_swab_line(void *dbuf, const void *sbuf,
unsigned int pixels)
{
u16 *dbuf16 = dbuf;
const __le32 *sbuf32 = sbuf;
unsigned int x;
u16 val16;
u32 pix;
for (x = 0; x < pixels; x++) {
pix = le32_to_cpu(sbuf32[x]);
val16 = ((pix & 0x00F80000) >> 8) |
((pix & 0x0000FC00) >> 5) |
((pix & 0x000000F8) >> 3);
dbuf16[x] = swab16(val16);
}
}
/**
* drm_fb_xrgb8888_to_rgb565 - Convert XRGB8888 to RGB565 clip buffer
* @dst: Array of RGB565 destination buffers
* @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
* within @dst; can be NULL if scanlines are stored next to each other.
* @src: Array of XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
* @swab: Swap bytes
*
* This function copies parts of a framebuffer to display memory and converts the
* color format during the process. Destination and framebuffer formats must match. The
* parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
* least as many entries as there are planes in @fb's format. Each entry stores the
* value for the format's respective color plane at the same index.
*
* This function does not apply clipping on @dst (i.e. the destination is at the
* top-left corner).
*
* Drivers can use this function for RGB565 devices that don't support XRGB8888 natively.
*/
void drm_fb_xrgb8888_to_rgb565(struct iosys_map *dst, const unsigned int *dst_pitch,
const struct iosys_map *src, const struct drm_framebuffer *fb,
const struct drm_rect *clip, bool swab)
{
static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
2,
};
void (*xfrm_line)(void *dbuf, const void *sbuf, unsigned int npixels);
if (swab)
xfrm_line = drm_fb_xrgb8888_to_rgb565_swab_line;
else
xfrm_line = drm_fb_xrgb8888_to_rgb565_line;
drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false, xfrm_line);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);
static void drm_fb_xrgb8888_to_rgb888_line(void *dbuf, const void *sbuf, unsigned int pixels)
{
u8 *dbuf8 = dbuf;
const __le32 *sbuf32 = sbuf;
unsigned int x;
u32 pix;
for (x = 0; x < pixels; x++) {
pix = le32_to_cpu(sbuf32[x]);
*dbuf8++ = (pix & 0x000000FF) >> 0;
*dbuf8++ = (pix & 0x0000FF00) >> 8;
*dbuf8++ = (pix & 0x00FF0000) >> 16;
}
}
/**
* drm_fb_xrgb8888_to_rgb888 - Convert XRGB8888 to RGB888 clip buffer
* @dst: Array of RGB888 destination buffers
* @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
* within @dst; can be NULL if scanlines are stored next to each other.
* @src: Array of XRGB8888 source buffers
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* This function copies parts of a framebuffer to display memory and converts the
* color format during the process. Destination and framebuffer formats must match. The
* parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
* least as many entries as there are planes in @fb's format. Each entry stores the
* value for the format's respective color plane at the same index.
*
* This function does not apply clipping on @dst (i.e. the destination is at the
* top-left corner).
*
* Drivers can use this function for RGB888 devices that don't natively
* support XRGB8888.
*/
void drm_fb_xrgb8888_to_rgb888(struct iosys_map *dst, const unsigned int *dst_pitch,
const struct iosys_map *src, const struct drm_framebuffer *fb,
const struct drm_rect *clip)
{
static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
3,
};
drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false,
drm_fb_xrgb8888_to_rgb888_line);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888);
static void drm_fb_rgb565_to_xrgb8888_line(void *dbuf, const void *sbuf, unsigned int pixels)
{
__le32 *dbuf32 = dbuf;
const __le16 *sbuf16 = sbuf;
unsigned int x;
for (x = 0; x < pixels; x++) {
u16 val16 = le16_to_cpu(sbuf16[x]);
u32 val32 = ((val16 & 0xf800) << 8) |
((val16 & 0x07e0) << 5) |
((val16 & 0x001f) << 3);
val32 = 0xff000000 | val32 |
((val32 >> 3) & 0x00070007) |
((val32 >> 2) & 0x00000300);
dbuf32[x] = cpu_to_le32(val32);
}
}
static void drm_fb_rgb565_to_xrgb8888(struct iosys_map *dst, const unsigned int *dst_pitch,
const struct iosys_map *src,
const struct drm_framebuffer *fb,
const struct drm_rect *clip)
{
static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
4,
};
drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false,
drm_fb_rgb565_to_xrgb8888_line);
}
static void drm_fb_rgb888_to_xrgb8888_line(void *dbuf, const void *sbuf, unsigned int pixels)
{
__le32 *dbuf32 = dbuf;
const u8 *sbuf8 = sbuf;
unsigned int x;
for (x = 0; x < pixels; x++) {
u8 r = *sbuf8++;
u8 g = *sbuf8++;
u8 b = *sbuf8++;
u32 pix = 0xff000000 | (r << 16) | (g << 8) | b;
dbuf32[x] = cpu_to_le32(pix);
}
}
static void drm_fb_rgb888_to_xrgb8888(struct iosys_map *dst, const unsigned int *dst_pitch,
const struct iosys_map *src,
const struct drm_framebuffer *fb,
const struct drm_rect *clip)
{
static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
4,
};
drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false,
drm_fb_rgb888_to_xrgb8888_line);
}
static void drm_fb_xrgb8888_to_xrgb2101010_line(void *dbuf, const void *sbuf, unsigned int pixels)
{
__le32 *dbuf32 = dbuf;
const __le32 *sbuf32 = sbuf;
unsigned int x;
u32 val32;
u32 pix;
for (x = 0; x < pixels; x++) {
pix = le32_to_cpu(sbuf32[x]);
val32 = ((pix & 0x000000FF) << 2) |
((pix & 0x0000FF00) << 4) |
((pix & 0x00FF0000) << 6);
pix = val32 | ((val32 >> 8) & 0x00300C03);
*dbuf32++ = cpu_to_le32(pix);
}
}
/**
* drm_fb_xrgb8888_to_xrgb2101010 - Convert XRGB8888 to XRGB2101010 clip buffer
* @dst: Array of XRGB2101010 destination buffers
* @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
* within @dst; can be NULL if scanlines are stored next to each other.
* @src: Array of XRGB8888 source buffers
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* This function copies parts of a framebuffer to display memory and converts the
* color format during the process. Destination and framebuffer formats must match. The
* parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
* least as many entries as there are planes in @fb's format. Each entry stores the
* value for the format's respective color plane at the same index.
*
* This function does not apply clipping on @dst (i.e. the destination is at the
* top-left corner).
*
* Drivers can use this function for XRGB2101010 devices that don't support XRGB8888
* natively.
*/
void drm_fb_xrgb8888_to_xrgb2101010(struct iosys_map *dst, const unsigned int *dst_pitch,
const struct iosys_map *src, const struct drm_framebuffer *fb,
const struct drm_rect *clip)
{
static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
4,
};
drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false,
drm_fb_xrgb8888_to_xrgb2101010_line);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_xrgb2101010);
static void drm_fb_xrgb8888_to_gray8_line(void *dbuf, const void *sbuf, unsigned int pixels)
{
u8 *dbuf8 = dbuf;
const __le32 *sbuf32 = sbuf;
unsigned int x;
for (x = 0; x < pixels; x++) {
u32 pix = le32_to_cpu(sbuf32[x]);
u8 r = (pix & 0x00ff0000) >> 16;
u8 g = (pix & 0x0000ff00) >> 8;
u8 b = pix & 0x000000ff;
/* ITU BT.601: Y = 0.299 R + 0.587 G + 0.114 B */
*dbuf8++ = (3 * r + 6 * g + b) / 10;
}
}
/**
* drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
* @dst: Array of 8-bit grayscale destination buffers
* @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
* within @dst; can be NULL if scanlines are stored next to each other.
* @src: Array of XRGB8888 source buffers
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* This function copies parts of a framebuffer to display memory and converts the
* color format during the process. Destination and framebuffer formats must match. The
* parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
* least as many entries as there are planes in @fb's format. Each entry stores the
* value for the format's respective color plane at the same index.
*
* This function does not apply clipping on @dst (i.e. the destination is at the
* top-left corner).
*
* DRM doesn't have native monochrome or grayscale support. Drivers can use this
* function for grayscale devices that don't support XRGB8888 natively.Such
* drivers can announce the commonly supported XR24 format to userspace and use
* this function to convert to the native format. Monochrome drivers will use the
* most significant bit, where 1 means foreground color and 0 background color.
* ITU BT.601 is being used for the RGB -> luma (brightness) conversion.
*/
void drm_fb_xrgb8888_to_gray8(struct iosys_map *dst, const unsigned int *dst_pitch,
const struct iosys_map *src, const struct drm_framebuffer *fb,
const struct drm_rect *clip)
{
static const u8 dst_pixsize[DRM_FORMAT_MAX_PLANES] = {
1,
};
drm_fb_xfrm(dst, dst_pitch, dst_pixsize, src, fb, clip, false,
drm_fb_xrgb8888_to_gray8_line);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);
/**
* drm_fb_blit - Copy parts of a framebuffer to display memory
* @dst: Array of display-memory addresses to copy to
* @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
* within @dst; can be NULL if scanlines are stored next to each other.
* @dst_format: FOURCC code of the display's color format
* @src: 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 during the process. The parameters @dst,
* @dst_pitch and @src refer to arrays. Each array must have at least as many
* entries as there are planes in @dst_format's format. Each entry stores the
* value for the format's respective color plane at the same index.
*
* This function does not apply clipping on @dst (i.e. the destination is at the
* top-left corner).
*
* Returns:
* 0 on success, or
* -EINVAL if the color-format conversion failed, or
* a negative error code otherwise.
*/
int drm_fb_blit(struct iosys_map *dst, const unsigned int *dst_pitch, uint32_t dst_format,
const struct iosys_map *src, const struct drm_framebuffer *fb,
const 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 (fb_format == DRM_FORMAT_ARGB2101010)
fb_format = DRM_FORMAT_XRGB2101010;
if (dst_format == DRM_FORMAT_ARGB2101010)
dst_format = DRM_FORMAT_XRGB2101010;
if (dst_format == fb_format) {
drm_fb_memcpy(dst, dst_pitch, src, fb, clip);
return 0;
} else if (dst_format == DRM_FORMAT_RGB565) {
if (fb_format == DRM_FORMAT_XRGB8888) {
drm_fb_xrgb8888_to_rgb565(dst, dst_pitch, src, fb, clip, false);
return 0;
}
} else if (dst_format == (DRM_FORMAT_RGB565 | DRM_FORMAT_BIG_ENDIAN)) {
if (fb_format == DRM_FORMAT_RGB565) {
drm_fb_swab(dst, dst_pitch, src, fb, clip, false);
return 0;
}
} else if (dst_format == DRM_FORMAT_RGB888) {
if (fb_format == DRM_FORMAT_XRGB8888) {
drm_fb_xrgb8888_to_rgb888(dst, dst_pitch, src, fb, clip);
return 0;
}
} else if (dst_format == DRM_FORMAT_XRGB8888) {
if (fb_format == DRM_FORMAT_RGB888) {
drm_fb_rgb888_to_xrgb8888(dst, dst_pitch, src, fb, clip);
return 0;
} else if (fb_format == DRM_FORMAT_RGB565) {
drm_fb_rgb565_to_xrgb8888(dst, dst_pitch, src, fb, clip);
return 0;
}
} else if (dst_format == DRM_FORMAT_XRGB2101010) {
if (fb_format == DRM_FORMAT_XRGB8888) {
drm_fb_xrgb8888_to_xrgb2101010(dst, dst_pitch, src, fb, clip);
return 0;
}
} else if (dst_format == DRM_FORMAT_BGRX8888) {
if (fb_format == DRM_FORMAT_XRGB8888) {
drm_fb_swab(dst, dst_pitch, src, fb, clip, false);
return 0;
}
}
drm_warn_once(fb->dev, "No conversion helper from %p4cc to %p4cc found.\n",
&fb_format, &dst_format);
return -EINVAL;
}
EXPORT_SYMBOL(drm_fb_blit);
static void drm_fb_gray8_to_mono_line(void *dbuf, const void *sbuf, unsigned int pixels)
{
u8 *dbuf8 = dbuf;
const u8 *sbuf8 = sbuf;
while (pixels) {
unsigned int i, bits = min(pixels, 8U);
u8 byte = 0;
for (i = 0; i < bits; i++, pixels--) {
if (*sbuf8++ >= 128)
byte |= BIT(i);
}
*dbuf8++ = byte;
}
}
/**
* drm_fb_xrgb8888_to_mono - Convert XRGB8888 to monochrome
* @dst: Array of monochrome destination buffers (0=black, 1=white)
* @dst_pitch: Array of numbers of bytes between the start of two consecutive scanlines
* within @dst; can be NULL if scanlines are stored next to each other.
* @src: Array of XRGB8888 source buffers
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* This function copies parts of a framebuffer to display memory and converts the
* color format during the process. Destination and framebuffer formats must match. The
* parameters @dst, @dst_pitch and @src refer to arrays. Each array must have at
* least as many entries as there are planes in @fb's format. Each entry stores the
* value for the format's respective color plane at the same index.
*
* This function does not apply clipping on @dst (i.e. the destination is at the
* top-left corner). The first pixel (upper left corner of the clip rectangle) will
* be converted and copied to the first bit (LSB) in the first byte of the monochrome
* destination buffer. If the caller requires that the first pixel in a byte must
* be located at an x-coordinate that is a multiple of 8, then the caller must take
* care itself of supplying a suitable clip rectangle.
*
* DRM doesn't have native monochrome support. Drivers can use this function for
* monochrome devices that don't support XRGB8888 natively. Such drivers can
* announce the commonly supported XR24 format to userspace and use this function
* to convert to the native format.
*
* This function uses drm_fb_xrgb8888_to_gray8() to convert to grayscale and
* then the result is converted from grayscale to monochrome.
*/
void drm_fb_xrgb8888_to_mono(struct iosys_map *dst, const unsigned int *dst_pitch,
const struct iosys_map *src, const struct drm_framebuffer *fb,
const struct drm_rect *clip)
{
static const unsigned int default_dst_pitch[DRM_FORMAT_MAX_PLANES] = {
0, 0, 0, 0
};
unsigned int linepixels = drm_rect_width(clip);
unsigned int lines = drm_rect_height(clip);
unsigned int cpp = fb->format->cpp[0];
unsigned int len_src32 = linepixels * cpp;
struct drm_device *dev = fb->dev;
void *vaddr = src[0].vaddr;
unsigned int dst_pitch_0;
unsigned int y;
u8 *mono = dst[0].vaddr, *gray8;
u32 *src32;
if (drm_WARN_ON(dev, fb->format->format != DRM_FORMAT_XRGB8888))
return;
if (!dst_pitch)
dst_pitch = default_dst_pitch;
dst_pitch_0 = dst_pitch[0];
/*
* The mono destination buffer contains 1 bit per pixel
*/
if (!dst_pitch_0)
dst_pitch_0 = DIV_ROUND_UP(linepixels, 8);
/*
* The dma memory is write-combined so reads are uncached.
* Speed up by fetching one line at a time.
*
* Also, format conversion from XR24 to monochrome are done
* line-by-line but are converted to 8-bit grayscale as an
* intermediate step.
*
* Allocate a buffer to be used for both copying from the cma
* memory and to store the intermediate grayscale line pixels.
*/
src32 = kmalloc(len_src32 + linepixels, GFP_KERNEL);
if (!src32)
return;
gray8 = (u8 *)src32 + len_src32;
vaddr += clip_offset(clip, fb->pitches[0], cpp);
for (y = 0; y < lines; y++) {
src32 = memcpy(src32, vaddr, len_src32);
drm_fb_xrgb8888_to_gray8_line(gray8, src32, linepixels);
drm_fb_gray8_to_mono_line(mono, gray8, linepixels);
vaddr += fb->pitches[0];
mono += dst_pitch_0;
}
kfree(src32);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_mono);
static bool is_listed_fourcc(const uint32_t *fourccs, size_t nfourccs, uint32_t fourcc)
{
const uint32_t *fourccs_end = fourccs + nfourccs;
while (fourccs < fourccs_end) {
if (*fourccs == fourcc)
return true;
++fourccs;
}
return false;
}
static const uint32_t conv_from_xrgb8888[] = {
DRM_FORMAT_XRGB8888,
DRM_FORMAT_ARGB8888,
DRM_FORMAT_XRGB2101010,
DRM_FORMAT_ARGB2101010,
DRM_FORMAT_RGB565,
DRM_FORMAT_RGB888,
};
static const uint32_t conv_from_rgb565_888[] = {
DRM_FORMAT_XRGB8888,
DRM_FORMAT_ARGB8888,
};
static bool is_conversion_supported(uint32_t from, uint32_t to)
{
switch (from) {
case DRM_FORMAT_XRGB8888:
case DRM_FORMAT_ARGB8888:
return is_listed_fourcc(conv_from_xrgb8888, ARRAY_SIZE(conv_from_xrgb8888), to);
case DRM_FORMAT_RGB565:
case DRM_FORMAT_RGB888:
return is_listed_fourcc(conv_from_rgb565_888, ARRAY_SIZE(conv_from_rgb565_888), to);
case DRM_FORMAT_XRGB2101010:
return to == DRM_FORMAT_ARGB2101010;
case DRM_FORMAT_ARGB2101010:
return to == DRM_FORMAT_XRGB2101010;
default:
return false;
}
}
/**
* drm_fb_build_fourcc_list - Filters a list of supported color formats against
* the device's native formats
* @dev: DRM device
* @native_fourccs: 4CC codes of natively supported color formats
* @native_nfourccs: The number of entries in @native_fourccs
* @driver_fourccs: 4CC codes of all driver-supported color formats
* @driver_nfourccs: The number of entries in @driver_fourccs
* @fourccs_out: Returns 4CC codes of supported color formats
* @nfourccs_out: The number of available entries in @fourccs_out
*
* This function create a list of supported color format from natively
* supported formats and the emulated formats.
* At a minimum, most userspace programs expect at least support for
* XRGB8888 on the primary plane. Devices that have to emulate the
* format, and possibly others, can use drm_fb_build_fourcc_list() to
* create a list of supported color formats. The returned list can
* be handed over to drm_universal_plane_init() et al. Native formats
* will go before emulated formats. Other heuristics might be applied
* to optimize the order. Formats near the beginning of the list are
* usually preferred over formats near the end of the list. Formats
* without conversion helpers will be skipped. New drivers should only
* pass in XRGB8888 and avoid exposing additional emulated formats.
*
* Returns:
* The number of color-formats 4CC codes returned in @fourccs_out.
*/
size_t drm_fb_build_fourcc_list(struct drm_device *dev,
const u32 *native_fourccs, size_t native_nfourccs,
const u32 *driver_fourccs, size_t driver_nfourccs,
u32 *fourccs_out, size_t nfourccs_out)
{
u32 *fourccs = fourccs_out;
const u32 *fourccs_end = fourccs_out + nfourccs_out;
uint32_t native_format = 0;
size_t i;
/*
* The device's native formats go first.
*/
for (i = 0; i < native_nfourccs; ++i) {
u32 fourcc = native_fourccs[i];
if (is_listed_fourcc(fourccs_out, fourccs - fourccs_out, fourcc)) {
continue; /* skip duplicate entries */
} else if (fourccs == fourccs_end) {
drm_warn(dev, "Ignoring native format %p4cc\n", &fourcc);
continue; /* end of available output buffer */
}
drm_dbg_kms(dev, "adding native format %p4cc\n", &fourcc);
/*
* There should only be one native format with the current API.
* This API needs to be refactored to correctly support arbitrary
* sets of native formats, since it needs to report which native
* format to use for each emulated format.
*/
if (!native_format)
native_format = fourcc;
*fourccs = fourcc;
++fourccs;
}
/*
* The extra formats, emulated by the driver, go second.
*/
for (i = 0; (i < driver_nfourccs) && (fourccs < fourccs_end); ++i) {
u32 fourcc = driver_fourccs[i];
if (is_listed_fourcc(fourccs_out, fourccs - fourccs_out, fourcc)) {
continue; /* skip duplicate and native entries */
} else if (fourccs == fourccs_end) {
drm_warn(dev, "Ignoring emulated format %p4cc\n", &fourcc);
continue; /* end of available output buffer */
} else if (!is_conversion_supported(fourcc, native_format)) {
drm_dbg_kms(dev, "Unsupported emulated format %p4cc\n", &fourcc);
continue; /* format is not supported for conversion */
}
drm_dbg_kms(dev, "adding emulated format %p4cc\n", &fourcc);
*fourccs = fourcc;
++fourccs;
}
return fourccs - fourccs_out;
}
EXPORT_SYMBOL(drm_fb_build_fourcc_list);