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Optimized fake brightness code (#1915)

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Mark Thompson 2024-02-17 18:44:06 -06:00 committed by GitHub
parent 3499d2fa75
commit a1f7010e08
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1 changed files with 19 additions and 33 deletions
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52
firmware/common/portapack_io.hpp
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@ -35,6 +35,21 @@
// #include "portapack_persistent_memory.hpp" // #include "portapack_persistent_memory.hpp"
// Darkened pixel bit mask for each possible shift value.
static const uint16_t darken_mask[4] = {
0b1111111111111111, // RrrrrGgggggBbbbb
0b0111101111101111, // 0Rrrr0Ggggg0Bbbb
0b0011100111100111, // 00Rrr00Gggg00Bbb
0b0001100011100011 // 000Rr000Ggg000Bb
};
// To darken, dividing each color level R/G/B by 2^shift.
#define DARKENED_PIXEL(pixel, shift) ((pixel >> shift) & darken_mask[shift])
// To un-darken, multiply each color level by 2^shift (might still be darker that before since some bits may have been lost above).
// This function will only be called when the pixel has previously been darkened, so no masking is needed.
#define UNDARKENED_PIXEL(pixel, shift) (pixel << shift)
namespace portapack { namespace portapack {
class IO { class IO {
@ -148,7 +163,7 @@ class IO {
void lcd_write_pixel(ui::Color pixel) { void lcd_write_pixel(ui::Color pixel) {
if (get_dark_cover()) { if (get_dark_cover()) {
shift_color(pixel, get_brightness(), false); // Darken the pixel color pixel.v = DARKENED_PIXEL(pixel.v, get_brightness());
} }
lcd_write_data(pixel.v); lcd_write_data(pixel.v);
} }
@ -159,7 +174,7 @@ class IO {
void lcd_write_pixels(ui::Color pixel, size_t n) { void lcd_write_pixels(ui::Color pixel, size_t n) {
if (get_dark_cover()) { if (get_dark_cover()) {
shift_color(pixel, get_brightness(), false); // Darken the pixel color pixel.v = DARKENED_PIXEL(pixel.v, get_brightness());
} }
while (n--) { while (n--) {
lcd_write_data(pixel.v); lcd_write_data(pixel.v);
@ -168,7 +183,7 @@ class IO {
void lcd_write_pixels_unrolled8(ui::Color pixel, size_t n) { void lcd_write_pixels_unrolled8(ui::Color pixel, size_t n) {
if (get_dark_cover()) { if (get_dark_cover()) {
shift_color(pixel, get_brightness(), false); // Darken the pixel color pixel.v = DARKENED_PIXEL(pixel.v, get_brightness());
} }
auto v = pixel.v; auto v = pixel.v;
n >>= 3; n >>= 3;
@ -332,31 +347,6 @@ class IO {
addr(1); /* Set up for data phase (most likely after a command) */ addr(1); /* Set up for data phase (most likely after a command) */
} }
void shift_color(ui::Color& pixel, uint8_t shift_level, bool shift_left) {
// TODO: 1. do we need edge control?
// currently didn't see and issue without edge control
// but maybe hurts screen hardware without one?
// TODO: 2. de-color mode for accessibility
// TODO: 3. high contrast mode for accessibility
uint16_t r = (pixel.v >> 11) & 0x1F; // Extract red
uint16_t g = (pixel.v >> 5) & 0x3F; // Extract green
uint16_t b = pixel.v & 0x1F; // Extract blue
if (shift_left) { // Shfting
r = r << shift_level;
g = g << shift_level;
b = b << shift_level;
} else if (!shift_left) {
r = r >> shift_level;
g = g >> shift_level;
b = b >> shift_level;
}
pixel.v = (r << 11) | (g << 5) | b; // Combine back to color, check UI::color for the color layout
}
// void high_contrast(ui::Color& pixel, size_t contrast_level_shift) { // TODO // void high_contrast(ui::Color& pixel, size_t contrast_level_shift) { // TODO
// uint16_t r = (pixel.v >> 11) & 0x1F; // uint16_t r = (pixel.v >> 11) & 0x1F;
// uint16_t g = (pixel.v >> 5) & 0x3F; // uint16_t g = (pixel.v >> 5) & 0x3F;
@ -427,12 +417,8 @@ class IO {
uint32_t original_value = (value_high << 8) | value_low; uint32_t original_value = (value_high << 8) | value_low;
if (get_dark_cover()) { if (get_dark_cover()) {
ui::Color pixel; original_value = UNDARKENED_PIXEL(original_value, get_brightness());
pixel.v = original_value;
shift_color(pixel, get_brightness(), true);
original_value = pixel.v;
} }
return original_value; return original_value;
} }