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extmod/modframebuf: Add hline, vline, rect and line methods.

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These are basic drawing primitives.  They work in a generic way on all
framebuf formats by calling the underlying setpixel or fill_rect C-level
primitives.
This commit is contained in:
Damien George 2016-12-05 11:52:51 +11:00
parent 0db3a41f02
commit 374ed317c5
1 changed files with 129 additions and 12 deletions
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141
extmod/modframebuf.c
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@ -113,6 +113,21 @@ static inline uint32_t getpixel(const mp_obj_framebuf_t *fb, int x, int y) {
return formats[fb->format].getpixel(fb, x, y);
}
STATIC void fill_rect(const mp_obj_framebuf_t *fb, int x, int y, int w, int h, uint32_t col) {
if (x + w <= 0 || y + h <= 0 || y >= fb->height || x >= fb->width) {
// No operation needed.
return;
}
// clip to the framebuffer
int xend = MIN(fb->width, x + w);
int yend = MIN(fb->height, y + h);
x = MAX(x, 0);
y = MAX(y, 0);
formats[fb->format].fill_rect(fb, x, y, xend - x, yend - y, col);
}
STATIC mp_obj_t framebuf_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
mp_arg_check_num(n_args, n_kw, 4, 5, false);
@ -162,18 +177,7 @@ STATIC mp_obj_t framebuf_fill_rect(size_t n_args, const mp_obj_t *args) {
mp_int_t height = mp_obj_get_int(args[4]);
mp_int_t color = mp_obj_get_int(args[5]);
if (x + width <= 0 || y + height <= 0 || y >= self->height || x >= self->width) {
// No operation needed.
return mp_const_none;
}
// clip to the framebuffer
int xend = MIN(self->width, x + width);
int yend = MIN(self->height, y + height);
x = MAX(MIN(x, self->width), 0);
y = MAX(MIN(y, self->height), 0);
formats[self->format].fill_rect(self, x, y, xend - x, yend - y, color);
fill_rect(self, x, y, width, height, color);
return mp_const_none;
}
@ -196,6 +200,115 @@ STATIC mp_obj_t framebuf_pixel(size_t n_args, const mp_obj_t *args) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_pixel_obj, 3, 4, framebuf_pixel);
STATIC mp_obj_t framebuf_hline(size_t n_args, const mp_obj_t *args) {
(void)n_args;
mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
mp_int_t x = mp_obj_get_int(args[1]);
mp_int_t y = mp_obj_get_int(args[2]);
mp_int_t w = mp_obj_get_int(args[3]);
mp_int_t col = mp_obj_get_int(args[4]);
fill_rect(self, x, y, w, 1, col);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_hline_obj, 5, 5, framebuf_hline);
STATIC mp_obj_t framebuf_vline(size_t n_args, const mp_obj_t *args) {
(void)n_args;
mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
mp_int_t x = mp_obj_get_int(args[1]);
mp_int_t y = mp_obj_get_int(args[2]);
mp_int_t h = mp_obj_get_int(args[3]);
mp_int_t col = mp_obj_get_int(args[4]);
fill_rect(self, x, y, 1, h, col);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_vline_obj, 5, 5, framebuf_vline);
STATIC mp_obj_t framebuf_rect(size_t n_args, const mp_obj_t *args) {
(void)n_args;
mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
mp_int_t x = mp_obj_get_int(args[1]);
mp_int_t y = mp_obj_get_int(args[2]);
mp_int_t w = mp_obj_get_int(args[3]);
mp_int_t h = mp_obj_get_int(args[4]);
mp_int_t col = mp_obj_get_int(args[5]);
fill_rect(self, x, y, w, 1, col);
fill_rect(self, x, y + h- 1, w, 1, col);
fill_rect(self, x, y, 1, h, col);
fill_rect(self, x + w- 1, y, 1, h, col);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_rect_obj, 6, 6, framebuf_rect);
STATIC mp_obj_t framebuf_line(size_t n_args, const mp_obj_t *args) {
(void)n_args;
mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
mp_int_t x1 = mp_obj_get_int(args[1]);
mp_int_t y1 = mp_obj_get_int(args[2]);
mp_int_t x2 = mp_obj_get_int(args[3]);
mp_int_t y2 = mp_obj_get_int(args[4]);
mp_int_t col = mp_obj_get_int(args[5]);
mp_int_t dx = x2 - x1;
mp_int_t sx;
if (dx > 0) {
sx = 1;
} else {
dx = -dx;
sx = -1;
}
mp_int_t dy = y2 - y1;
mp_int_t sy;
if (dy > 0) {
sy = 1;
} else {
dy = -dy;
sy = -1;
}
bool steep;
if (dy > dx) {
mp_int_t temp;
temp = x1; x1 = y1; y1 = temp;
temp = dx; dx = dy; dy = temp;
temp = sx; sx = sy; sy = temp;
steep = true;
} else {
steep = false;
}
mp_int_t e = 2 * dy - dx;
for (mp_int_t i = 0; i < dx; ++i) {
if (steep) {
setpixel(self, y1, x1, col);
} else {
setpixel(self, x1, y1, col);
}
while (e >= 0) {
y1 += sy;
e -= 2 * dx;
}
x1 += sx;
e += 2 * dy;
}
setpixel(self, x2, y2, col);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_line_obj, 6, 6, framebuf_line);
STATIC mp_obj_t framebuf_blit(size_t n_args, const mp_obj_t *args) {
mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
mp_obj_framebuf_t *source = MP_OBJ_TO_PTR(args[1]);
@ -314,6 +427,10 @@ STATIC const mp_rom_map_elem_t framebuf_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_fill), MP_ROM_PTR(&framebuf_fill_obj) },
{ MP_ROM_QSTR(MP_QSTR_fill_rect), MP_ROM_PTR(&framebuf_fill_rect_obj) },
{ MP_ROM_QSTR(MP_QSTR_pixel), MP_ROM_PTR(&framebuf_pixel_obj) },
{ MP_ROM_QSTR(MP_QSTR_hline), MP_ROM_PTR(&framebuf_hline_obj) },
{ MP_ROM_QSTR(MP_QSTR_vline), MP_ROM_PTR(&framebuf_vline_obj) },
{ MP_ROM_QSTR(MP_QSTR_rect), MP_ROM_PTR(&framebuf_rect_obj) },
{ MP_ROM_QSTR(MP_QSTR_line), MP_ROM_PTR(&framebuf_line_obj) },
{ MP_ROM_QSTR(MP_QSTR_blit), MP_ROM_PTR(&framebuf_blit_obj) },
{ MP_ROM_QSTR(MP_QSTR_scroll), MP_ROM_PTR(&framebuf_scroll_obj) },
{ MP_ROM_QSTR(MP_QSTR_text), MP_ROM_PTR(&framebuf_text_obj) },