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feat(core): perform 0.55 gamma correction on emulator display

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grdddj 2023-03-20 19:22:07 +01:00 committed by Jiří Musil
parent 3f54b84aef
commit a1974f6953
1 changed files with 26 additions and 0 deletions
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26
core/embed/unix/display-unix.c
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@ -20,6 +20,7 @@
#include <SDL.h> #include <SDL.h>
#include <SDL_image.h> #include <SDL_image.h>
#include <math.h>
#include <stdarg.h> #include <stdarg.h>
#include <stdbool.h> #include <stdbool.h>
#include <stddef.h> #include <stddef.h>
@ -69,6 +70,7 @@ static SDL_Surface *PREV_SAVED;
static int DISPLAY_BACKLIGHT = -1; static int DISPLAY_BACKLIGHT = -1;
static int DISPLAY_ORIENTATION = -1; static int DISPLAY_ORIENTATION = -1;
static float DISPLAY_GAMMA = 0.55f;
int sdl_display_res_x = DISPLAY_RESX, sdl_display_res_y = DISPLAY_RESY; int sdl_display_res_x = DISPLAY_RESX, sdl_display_res_y = DISPLAY_RESY;
int sdl_touch_offset_x, sdl_touch_offset_y; int sdl_touch_offset_x, sdl_touch_offset_y;
@ -87,12 +89,36 @@ static struct {
} pos; } pos;
} PIXELWINDOW; } PIXELWINDOW;
uint16_t gamma_correct(uint16_t c) {
// NOTE: 0x1f/31 and 0x3f/63 are maximum values of RGB components
// given the color is 16-bit (5 bits for R, 6 bits for G, 5 bits for B).
int r = (c >> 11) & 0x1f;
int g = (c >> 5) & 0x3f;
int b = c & 0x1f;
float fr = r / 31.0;
float fg = g / 63.0;
float fb = b / 31.0;
fr = pow(fr, DISPLAY_GAMMA);
fg = pow(fg, DISPLAY_GAMMA);
fb = pow(fb, DISPLAY_GAMMA);
r = (int)round(fr * 31.0);
g = (int)round(fg * 63.0);
b = (int)round(fb * 31.0);
return (r << 11) | (g << 5) | b;
}
void display_pixeldata(uint16_t c) { void display_pixeldata(uint16_t c) {
#if defined TREZOR_MODEL_1 || defined TREZOR_MODEL_R #if defined TREZOR_MODEL_1 || defined TREZOR_MODEL_R
// set to white if highest bits of all R, G, B values are set to 1 // set to white if highest bits of all R, G, B values are set to 1
// bin(10000 100000 10000) = hex(0x8410) // bin(10000 100000 10000) = hex(0x8410)
// otherwise set to black // otherwise set to black
c = (c & 0x8410) ? 0xFFFF : 0x0000; c = (c & 0x8410) ? 0xFFFF : 0x0000;
#elif defined TREZOR_MODEL_T
c = gamma_correct(c);
#endif #endif
if (!RENDERER) { if (!RENDERER) {
display_init(); display_init();