262 lines
8.5 KiB
C
262 lines
8.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/minmax.h>
|
|
#include <drm/drm_rect.h>
|
|
#include <drm/drm_fixed.h>
|
|
|
|
#include "vkms_formats.h"
|
|
|
|
static size_t pixel_offset(const struct vkms_frame_info *frame_info, int x, int y)
|
|
{
|
|
return frame_info->offset + (y * frame_info->pitch)
|
|
+ (x * frame_info->cpp);
|
|
}
|
|
|
|
/*
|
|
* packed_pixels_addr - Get the pointer to pixel of a given pair of coordinates
|
|
*
|
|
* @frame_info: Buffer metadata
|
|
* @x: The x(width) coordinate of the 2D buffer
|
|
* @y: The y(Heigth) coordinate of the 2D buffer
|
|
*
|
|
* Takes the information stored in the frame_info, a pair of coordinates, and
|
|
* returns the address of the first color channel.
|
|
* This function assumes the channels are packed together, i.e. a color channel
|
|
* comes immediately after another in the memory. And therefore, this function
|
|
* doesn't work for YUV with chroma subsampling (e.g. YUV420 and NV21).
|
|
*/
|
|
static void *packed_pixels_addr(const struct vkms_frame_info *frame_info,
|
|
int x, int y)
|
|
{
|
|
size_t offset = pixel_offset(frame_info, x, y);
|
|
|
|
return (u8 *)frame_info->map[0].vaddr + offset;
|
|
}
|
|
|
|
static void *get_packed_src_addr(const struct vkms_frame_info *frame_info, int y)
|
|
{
|
|
int x_src = frame_info->src.x1 >> 16;
|
|
int y_src = y - frame_info->dst.y1 + (frame_info->src.y1 >> 16);
|
|
|
|
return packed_pixels_addr(frame_info, x_src, y_src);
|
|
}
|
|
|
|
static void ARGB8888_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
|
|
{
|
|
/*
|
|
* The 257 is the "conversion ratio". This number is obtained by the
|
|
* (2^16 - 1) / (2^8 - 1) division. Which, in this case, tries to get
|
|
* the best color value in a pixel format with more possibilities.
|
|
* A similar idea applies to others RGB color conversions.
|
|
*/
|
|
out_pixel->a = (u16)src_pixels[3] * 257;
|
|
out_pixel->r = (u16)src_pixels[2] * 257;
|
|
out_pixel->g = (u16)src_pixels[1] * 257;
|
|
out_pixel->b = (u16)src_pixels[0] * 257;
|
|
}
|
|
|
|
static void XRGB8888_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
|
|
{
|
|
out_pixel->a = (u16)0xffff;
|
|
out_pixel->r = (u16)src_pixels[2] * 257;
|
|
out_pixel->g = (u16)src_pixels[1] * 257;
|
|
out_pixel->b = (u16)src_pixels[0] * 257;
|
|
}
|
|
|
|
static void ARGB16161616_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
|
|
{
|
|
u16 *pixels = (u16 *)src_pixels;
|
|
|
|
out_pixel->a = le16_to_cpu(pixels[3]);
|
|
out_pixel->r = le16_to_cpu(pixels[2]);
|
|
out_pixel->g = le16_to_cpu(pixels[1]);
|
|
out_pixel->b = le16_to_cpu(pixels[0]);
|
|
}
|
|
|
|
static void XRGB16161616_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
|
|
{
|
|
u16 *pixels = (u16 *)src_pixels;
|
|
|
|
out_pixel->a = (u16)0xffff;
|
|
out_pixel->r = le16_to_cpu(pixels[2]);
|
|
out_pixel->g = le16_to_cpu(pixels[1]);
|
|
out_pixel->b = le16_to_cpu(pixels[0]);
|
|
}
|
|
|
|
static void RGB565_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
|
|
{
|
|
u16 *pixels = (u16 *)src_pixels;
|
|
|
|
s64 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(31));
|
|
s64 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(63));
|
|
|
|
u16 rgb_565 = le16_to_cpu(*pixels);
|
|
s64 fp_r = drm_int2fixp((rgb_565 >> 11) & 0x1f);
|
|
s64 fp_g = drm_int2fixp((rgb_565 >> 5) & 0x3f);
|
|
s64 fp_b = drm_int2fixp(rgb_565 & 0x1f);
|
|
|
|
out_pixel->a = (u16)0xffff;
|
|
out_pixel->r = drm_fixp2int_round(drm_fixp_mul(fp_r, fp_rb_ratio));
|
|
out_pixel->g = drm_fixp2int_round(drm_fixp_mul(fp_g, fp_g_ratio));
|
|
out_pixel->b = drm_fixp2int_round(drm_fixp_mul(fp_b, fp_rb_ratio));
|
|
}
|
|
|
|
void vkms_compose_row(struct line_buffer *stage_buffer, struct vkms_plane_state *plane, int y)
|
|
{
|
|
struct pixel_argb_u16 *out_pixels = stage_buffer->pixels;
|
|
struct vkms_frame_info *frame_info = plane->frame_info;
|
|
u8 *src_pixels = get_packed_src_addr(frame_info, y);
|
|
int limit = min_t(size_t, drm_rect_width(&frame_info->dst), stage_buffer->n_pixels);
|
|
|
|
for (size_t x = 0; x < limit; x++, src_pixels += frame_info->cpp)
|
|
plane->pixel_read(src_pixels, &out_pixels[x]);
|
|
}
|
|
|
|
/*
|
|
* The following functions take an line of argb_u16 pixels from the
|
|
* src_buffer, convert them to a specific format, and store them in the
|
|
* destination.
|
|
*
|
|
* They are used in the `compose_active_planes` to convert and store a line
|
|
* from the src_buffer to the writeback buffer.
|
|
*/
|
|
static void argb_u16_to_ARGB8888(struct vkms_frame_info *frame_info,
|
|
const struct line_buffer *src_buffer, int y)
|
|
{
|
|
int x_dst = frame_info->dst.x1;
|
|
u8 *dst_pixels = packed_pixels_addr(frame_info, x_dst, y);
|
|
struct pixel_argb_u16 *in_pixels = src_buffer->pixels;
|
|
int x_limit = min_t(size_t, drm_rect_width(&frame_info->dst),
|
|
src_buffer->n_pixels);
|
|
|
|
for (size_t x = 0; x < x_limit; x++, dst_pixels += 4) {
|
|
/*
|
|
* This sequence below is important because the format's byte order is
|
|
* in little-endian. In the case of the ARGB8888 the memory is
|
|
* organized this way:
|
|
*
|
|
* | Addr | = blue channel
|
|
* | Addr + 1 | = green channel
|
|
* | Addr + 2 | = Red channel
|
|
* | Addr + 3 | = Alpha channel
|
|
*/
|
|
dst_pixels[3] = DIV_ROUND_CLOSEST(in_pixels[x].a, 257);
|
|
dst_pixels[2] = DIV_ROUND_CLOSEST(in_pixels[x].r, 257);
|
|
dst_pixels[1] = DIV_ROUND_CLOSEST(in_pixels[x].g, 257);
|
|
dst_pixels[0] = DIV_ROUND_CLOSEST(in_pixels[x].b, 257);
|
|
}
|
|
}
|
|
|
|
static void argb_u16_to_XRGB8888(struct vkms_frame_info *frame_info,
|
|
const struct line_buffer *src_buffer, int y)
|
|
{
|
|
int x_dst = frame_info->dst.x1;
|
|
u8 *dst_pixels = packed_pixels_addr(frame_info, x_dst, y);
|
|
struct pixel_argb_u16 *in_pixels = src_buffer->pixels;
|
|
int x_limit = min_t(size_t, drm_rect_width(&frame_info->dst),
|
|
src_buffer->n_pixels);
|
|
|
|
for (size_t x = 0; x < x_limit; x++, dst_pixels += 4) {
|
|
dst_pixels[3] = 0xff;
|
|
dst_pixels[2] = DIV_ROUND_CLOSEST(in_pixels[x].r, 257);
|
|
dst_pixels[1] = DIV_ROUND_CLOSEST(in_pixels[x].g, 257);
|
|
dst_pixels[0] = DIV_ROUND_CLOSEST(in_pixels[x].b, 257);
|
|
}
|
|
}
|
|
|
|
static void argb_u16_to_ARGB16161616(struct vkms_frame_info *frame_info,
|
|
const struct line_buffer *src_buffer, int y)
|
|
{
|
|
int x_dst = frame_info->dst.x1;
|
|
u16 *dst_pixels = packed_pixels_addr(frame_info, x_dst, y);
|
|
struct pixel_argb_u16 *in_pixels = src_buffer->pixels;
|
|
int x_limit = min_t(size_t, drm_rect_width(&frame_info->dst),
|
|
src_buffer->n_pixels);
|
|
|
|
for (size_t x = 0; x < x_limit; x++, dst_pixels += 4) {
|
|
dst_pixels[3] = cpu_to_le16(in_pixels[x].a);
|
|
dst_pixels[2] = cpu_to_le16(in_pixels[x].r);
|
|
dst_pixels[1] = cpu_to_le16(in_pixels[x].g);
|
|
dst_pixels[0] = cpu_to_le16(in_pixels[x].b);
|
|
}
|
|
}
|
|
|
|
static void argb_u16_to_XRGB16161616(struct vkms_frame_info *frame_info,
|
|
const struct line_buffer *src_buffer, int y)
|
|
{
|
|
int x_dst = frame_info->dst.x1;
|
|
u16 *dst_pixels = packed_pixels_addr(frame_info, x_dst, y);
|
|
struct pixel_argb_u16 *in_pixels = src_buffer->pixels;
|
|
int x_limit = min_t(size_t, drm_rect_width(&frame_info->dst),
|
|
src_buffer->n_pixels);
|
|
|
|
for (size_t x = 0; x < x_limit; x++, dst_pixels += 4) {
|
|
dst_pixels[3] = 0xffff;
|
|
dst_pixels[2] = cpu_to_le16(in_pixels[x].r);
|
|
dst_pixels[1] = cpu_to_le16(in_pixels[x].g);
|
|
dst_pixels[0] = cpu_to_le16(in_pixels[x].b);
|
|
}
|
|
}
|
|
|
|
static void argb_u16_to_RGB565(struct vkms_frame_info *frame_info,
|
|
const struct line_buffer *src_buffer, int y)
|
|
{
|
|
int x_dst = frame_info->dst.x1;
|
|
u16 *dst_pixels = packed_pixels_addr(frame_info, x_dst, y);
|
|
struct pixel_argb_u16 *in_pixels = src_buffer->pixels;
|
|
int x_limit = min_t(size_t, drm_rect_width(&frame_info->dst),
|
|
src_buffer->n_pixels);
|
|
|
|
s64 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(31));
|
|
s64 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(63));
|
|
|
|
for (size_t x = 0; x < x_limit; x++, dst_pixels++) {
|
|
s64 fp_r = drm_int2fixp(in_pixels[x].r);
|
|
s64 fp_g = drm_int2fixp(in_pixels[x].g);
|
|
s64 fp_b = drm_int2fixp(in_pixels[x].b);
|
|
|
|
u16 r = drm_fixp2int_round(drm_fixp_div(fp_r, fp_rb_ratio));
|
|
u16 g = drm_fixp2int_round(drm_fixp_div(fp_g, fp_g_ratio));
|
|
u16 b = drm_fixp2int_round(drm_fixp_div(fp_b, fp_rb_ratio));
|
|
|
|
*dst_pixels = cpu_to_le16(r << 11 | g << 5 | b);
|
|
}
|
|
}
|
|
|
|
void *get_pixel_conversion_function(u32 format)
|
|
{
|
|
switch (format) {
|
|
case DRM_FORMAT_ARGB8888:
|
|
return &ARGB8888_to_argb_u16;
|
|
case DRM_FORMAT_XRGB8888:
|
|
return &XRGB8888_to_argb_u16;
|
|
case DRM_FORMAT_ARGB16161616:
|
|
return &ARGB16161616_to_argb_u16;
|
|
case DRM_FORMAT_XRGB16161616:
|
|
return &XRGB16161616_to_argb_u16;
|
|
case DRM_FORMAT_RGB565:
|
|
return &RGB565_to_argb_u16;
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
void *get_line_to_frame_function(u32 format)
|
|
{
|
|
switch (format) {
|
|
case DRM_FORMAT_ARGB8888:
|
|
return &argb_u16_to_ARGB8888;
|
|
case DRM_FORMAT_XRGB8888:
|
|
return &argb_u16_to_XRGB8888;
|
|
case DRM_FORMAT_ARGB16161616:
|
|
return &argb_u16_to_ARGB16161616;
|
|
case DRM_FORMAT_XRGB16161616:
|
|
return &argb_u16_to_XRGB16161616;
|
|
case DRM_FORMAT_RGB565:
|
|
return &argb_u16_to_RGB565;
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|