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PNGdec: Add copy support and offset to greyscale.

patch-pngdec-palette-offset
Phil Howard 2024-03-28 14:59:02 +00:00
rodzic c7b788cd1d
commit 27b913124c
1 zmienionych plików z 14 dodań i 1 usunięć
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15
micropython/modules/pngdec/pngdec.cpp
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@ -209,7 +209,20 @@ mp_event_handle_nowait();
//mp_printf(&mp_plat_print, "Drawing pixel at %dx%d, %dbpp, value %d\n", current_position.x, current_position.y, pDraw->iBpp, i);
if (current_mode != MODE_PEN) {
current_graphics->set_pen(i, i, i);
// Allow greyscale PNGs to be copied just like an indexed PNG
// since we might want to offset and recolour them.
if(current_mode == MODE_COPY
&& (current_graphics->pen_type == PicoGraphics::PEN_P8
|| current_graphics->pen_type == PicoGraphics::PEN_P4
|| current_graphics->pen_type == PicoGraphics::PEN_3BIT
|| current_graphics->pen_type == PicoGraphics::PEN_INKY7)) {
if(current_palette_offset > 0) {
i += ((int16_t)(i) + current_palette_offset) & 0xff;
}
current_graphics->set_pen(i);
} else {
current_graphics->set_pen(i, i, i);
}
}
if (current_mode != MODE_PEN || i == 0) {
current_graphics->rectangle({current_position.x, current_position.y, scale.x, scale.y});