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extmod/modframebuf: Enable blit between different formats via a palette.

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This achieves a substantial performance improvement when rendering glyphs
to color displays, the benefit increasing proportional to the number of
pixels in the glyph.
This commit is contained in:
Peter Hinch
2021-08-18 20:05:25 +01:00
committed by Damien George
parent 996f703166
commit 2296df0a32
4 changed files with 59 additions and 5 deletions
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9
extmod/modframebuf.c
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@@ -491,6 +491,10 @@ STATIC mp_obj_t framebuf_blit(size_t n_args, const mp_obj_t *args) {
if (n_args > 4) {
key = mp_obj_get_int(args[4]);
}
mp_obj_framebuf_t *palette = NULL;
if (n_args > 5 && args[5] != mp_const_none) {
palette = MP_OBJ_TO_PTR(mp_obj_cast_to_native_base(args[5], MP_OBJ_FROM_PTR(&mp_type_framebuf)));
}
if (
(x >= self->width) ||
@@ -514,6 +518,9 @@ STATIC mp_obj_t framebuf_blit(size_t n_args, const mp_obj_t *args) {
int cx1 = x1;
for (int cx0 = x0; cx0 < x0end; ++cx0) {
uint32_t col = getpixel(source, cx1, y1);
if (palette) {
col = getpixel(palette, col, 0);
}
if (col != (uint32_t)key) {
setpixel(self, cx0, y0, col);
}
@@ -523,7 +530,7 @@ STATIC mp_obj_t framebuf_blit(size_t n_args, const mp_obj_t *args) {
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_blit_obj, 4, 5, framebuf_blit);
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_blit_obj, 4, 6, framebuf_blit);
STATIC mp_obj_t framebuf_scroll(mp_obj_t self_in, mp_obj_t xstep_in, mp_obj_t ystep_in) {
mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(self_in);