diff options
Diffstat (limited to 'drivers/gpu/drm/vkms/vkms_formats.c')
-rw-r--r-- | drivers/gpu/drm/vkms/vkms_formats.c | 53 |
1 files changed, 19 insertions, 34 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_formats.c b/drivers/gpu/drm/vkms/vkms_formats.c index 300abb4d1dfe..d4950688b3f1 100644 --- a/drivers/gpu/drm/vkms/vkms_formats.c +++ b/drivers/gpu/drm/vkms/vkms_formats.c @@ -1,27 +1,12 @@ // SPDX-License-Identifier: GPL-2.0+ -#include <drm/drm_rect.h> +#include <linux/kernel.h> #include <linux/minmax.h> +#include <drm/drm_rect.h> +#include <drm/drm_fixed.h> #include "vkms_formats.h" -/* The following macros help doing fixed point arithmetic. */ -/* - * With Fixed-Point scale 15 we have 17 and 15 bits of integer and fractional - * parts respectively. - * | 0000 0000 0000 0000 0.000 0000 0000 0000 | - * 31 0 - */ -#define SHIFT 15 - -#define INT_TO_FIXED(a) ((a) << SHIFT) -#define FIXED_MUL(a, b) ((s32)(((s64)(a) * (b)) >> SHIFT)) -#define FIXED_DIV(a, b) ((s32)(((s64)(a) << SHIFT) / (b))) -/* This macro converts a fixed point number to int, and round half up it */ -#define FIXED_TO_INT_ROUND(a) (((a) + (1 << (SHIFT - 1))) >> SHIFT) -#define INT_TO_FIXED_DIV(a, b) (FIXED_DIV(INT_TO_FIXED(a), INT_TO_FIXED(b))) -#define INT_TO_FIXED_DIV(a, b) (FIXED_DIV(INT_TO_FIXED(a), INT_TO_FIXED(b))) - static size_t pixel_offset(const struct vkms_frame_info *frame_info, int x, int y) { return frame_info->offset + (y * frame_info->pitch) @@ -137,19 +122,19 @@ static void RGB565_to_argb_u16(struct line_buffer *stage_buffer, int x_limit = min_t(size_t, drm_rect_width(&frame_info->dst), stage_buffer->n_pixels); - s32 fp_rb_ratio = INT_TO_FIXED_DIV(65535, 31); - s32 fp_g_ratio = INT_TO_FIXED_DIV(65535, 63); + 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++, src_pixels++) { u16 rgb_565 = le16_to_cpu(*src_pixels); - s32 fp_r = INT_TO_FIXED((rgb_565 >> 11) & 0x1f); - s32 fp_g = INT_TO_FIXED((rgb_565 >> 5) & 0x3f); - s32 fp_b = INT_TO_FIXED(rgb_565 & 0x1f); + 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_pixels[x].a = (u16)0xffff; - out_pixels[x].r = FIXED_TO_INT_ROUND(FIXED_MUL(fp_r, fp_rb_ratio)); - out_pixels[x].g = FIXED_TO_INT_ROUND(FIXED_MUL(fp_g, fp_g_ratio)); - out_pixels[x].b = FIXED_TO_INT_ROUND(FIXED_MUL(fp_b, fp_rb_ratio)); + out_pixels[x].r = drm_fixp2int(drm_fixp_mul(fp_r, fp_rb_ratio)); + out_pixels[x].g = drm_fixp2int(drm_fixp_mul(fp_g, fp_g_ratio)); + out_pixels[x].b = drm_fixp2int(drm_fixp_mul(fp_b, fp_rb_ratio)); } } @@ -248,17 +233,17 @@ static void argb_u16_to_RGB565(struct vkms_frame_info *frame_info, int x_limit = min_t(size_t, drm_rect_width(&frame_info->dst), src_buffer->n_pixels); - s32 fp_rb_ratio = INT_TO_FIXED_DIV(65535, 31); - s32 fp_g_ratio = INT_TO_FIXED_DIV(65535, 63); + 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++) { - s32 fp_r = INT_TO_FIXED(in_pixels[x].r); - s32 fp_g = INT_TO_FIXED(in_pixels[x].g); - s32 fp_b = INT_TO_FIXED(in_pixels[x].b); + 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 = FIXED_TO_INT_ROUND(FIXED_DIV(fp_r, fp_rb_ratio)); - u16 g = FIXED_TO_INT_ROUND(FIXED_DIV(fp_g, fp_g_ratio)); - u16 b = FIXED_TO_INT_ROUND(FIXED_DIV(fp_b, fp_rb_ratio)); + u16 r = drm_fixp2int(drm_fixp_div(fp_r, fp_rb_ratio)); + u16 g = drm_fixp2int(drm_fixp_div(fp_g, fp_g_ratio)); + u16 b = drm_fixp2int(drm_fixp_div(fp_b, fp_rb_ratio)); *dst_pixels = cpu_to_le16(r << 11 | g << 5 | b); } |