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