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PNGdec: Add palette offset arg. 

Allow index colour PNGs to be copied with a palette offset.

EG: a 4bit PNG could be offset 16 times for as many colour variations.
pull/919/head
Phil Howard 2024-03-28 14:54:28 +00:00
rodzic c386b3e9cf
commit c7b788cd1d
1 zmienionych plików z 15 dodań i 13 usunięć
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28
micropython/modules/pngdec/pngdec.cpp
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@ -25,6 +25,7 @@ typedef struct _PNG_decode_target {
Rect source = {0, 0, 0, 0};
Point scale = {1, 1};
int rotation = 0;
uint8_t palette_offset = 0;
} _PNG_decode_target;
typedef struct _PNG_obj_t {
@ -126,6 +127,7 @@ mp_event_handle_nowait();
PicoGraphics *current_graphics = (PicoGraphics *)target->target;
Point current_position = target->position;
uint8_t current_mode = target->mode;
uint8_t current_palette_offset = target->palette_offset;
Point scale = target->scale;
int rotation = target->rotation;
Point step = {0, 0};
@ -161,22 +163,15 @@ mp_event_handle_nowait();
//mp_printf(&mp_plat_print, "Drawing scanline at %d, %dbpp, type: %d, width: %d pitch: %d alpha: %d\n", pDraw->y , pDraw->iBpp, pDraw->iPixelType, pDraw->iWidth, pDraw->iPitch, pDraw->iHasAlpha);
uint8_t *pixel = (uint8_t *)pDraw->pPixels;
if(pDraw->iPixelType == PNG_PIXEL_TRUECOLOR ) {
if(pDraw->iPixelType == PNG_PIXEL_TRUECOLOR || pDraw->iPixelType == PNG_PIXEL_TRUECOLOR_ALPHA) {
for(int x = 0; x < pDraw->iWidth; x++) {
uint8_t r = *pixel++;
uint8_t g = *pixel++;
uint8_t b = *pixel++;
if(x < target->source.x || x >= target->source.x + target->source.w) continue;
current_graphics->set_pen(r, g, b);
current_graphics->rectangle({current_position.x, current_position.y, scale.x, scale.y});
current_position += step;
}
} else if (pDraw->iPixelType == PNG_PIXEL_TRUECOLOR_ALPHA) {
for(int x = 0; x < pDraw->iWidth; x++) {
uint8_t r = *pixel++;
uint8_t g = *pixel++;
uint8_t b = *pixel++;
uint8_t a = *pixel++;
uint8_t a = 1;
if (pDraw->iHasAlpha) {
a = *pixel++;
}
if(x < target->source.x || x >= target->source.x + target->source.w) continue;
if (a) {
current_graphics->set_pen(r, g, b);
@ -194,6 +189,7 @@ mp_event_handle_nowait();
i >>= (x & 0b1) ? 0 : 4;
i &= 0xf;
if (x & 1) pixel++;
// Just copy the colour into the upper and lower nibble
i = (i << 4) | i;
} else if (pDraw->iBpp == 2) { // 2bpp
i = *pixel;
@ -269,6 +265,9 @@ mp_event_handle_nowait();
// Copy raw palette indexes over
if(current_mode == MODE_COPY) {
if(current_palette_offset > 0) {
i += ((int16_t)(i) + current_palette_offset) & 0xff;
}
current_graphics->set_pen(i);
current_graphics->rectangle({current_position.x, current_position.y, scale.x, scale.y});
// Posterized output to the available palete
@ -364,7 +363,7 @@ mp_obj_t _PNG_openRAM(mp_obj_t self_in, mp_obj_t buffer) {
// decode
mp_obj_t _PNG_decode(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
enum { ARG_self, ARG_x, ARG_y, ARG_scale, ARG_mode, ARG_source, ARG_rotate };
enum { ARG_self, ARG_x, ARG_y, ARG_scale, ARG_mode, ARG_source, ARG_rotate, ARG_palette_offset };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_x, MP_ARG_INT, {.u_int = 0} },
@ -373,6 +372,7 @@ mp_obj_t _PNG_decode(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args)
{ MP_QSTR_mode, MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_source, MP_ARG_OBJ, {.u_obj = nullptr} },
{ MP_QSTR_rotate, MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_palette_offset, MP_ARG_INT, {.u_int = 0} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
@ -432,6 +432,8 @@ mp_obj_t _PNG_decode(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args)
self->decode_target->position = {args[ARG_x].u_int, args[ARG_y].u_int};
self->decode_target->palette_offset = args[ARG_palette_offset].u_int;
// Just-in-time open of the filename/buffer we stored in self->file via open_RAM or open_file
// Source is a filename