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circuitpython/extmod/modframebuf.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include <string.h>
#include "py/nlr.h"
#include "py/obj.h"
#include "py/runtime.h"
#if MICROPY_PY_FRAMEBUF
#include "stmhal/font_petme128_8x8.h"
typedef struct _mp_obj_framebuf_t {
mp_obj_base_t base;
mp_obj_t buf_obj; // need to store this to prevent GC from reclaiming buf
void *buf;
uint16_t width, height, stride;
uint8_t format;
} mp_obj_framebuf_t;
typedef void (*setpixel_t)(const mp_obj_framebuf_t*, int, int, uint32_t);
typedef uint32_t (*getpixel_t)(const mp_obj_framebuf_t*, int, int);
typedef void (*fill_rect_t)(const mp_obj_framebuf_t *, int, int, int, int, uint32_t);
typedef struct _mp_framebuf_p_t {
setpixel_t setpixel;
getpixel_t getpixel;
fill_rect_t fill_rect;
} mp_framebuf_p_t;
// Functions for MVLSB format
STATIC void mvlsb_setpixel(const mp_obj_framebuf_t *fb, int x, int y, uint32_t color) {
size_t index = (y >> 3) * fb->stride + x;
uint8_t offset = y & 0x07;
((uint8_t*)fb->buf)[index] = (((uint8_t*)fb->buf)[index] & ~(0x01 << offset)) | ((color != 0) << offset);
}
STATIC uint32_t mvlsb_getpixel(const mp_obj_framebuf_t *fb, int x, int y) {
return (((uint8_t*)fb->buf)[(y >> 3) * fb->stride + x] >> (y & 0x07)) & 0x01;
}
STATIC void mvlsb_fill_rect(const mp_obj_framebuf_t *fb, int x, int y, int w, int h, uint32_t col) {
while (h--) {
uint8_t *b = &((uint8_t*)fb->buf)[(y >> 3) * fb->stride + x];
uint8_t offset = y & 0x07;
for (int ww = w; ww; --ww) {
*b = (*b & ~(0x01 << offset)) | ((col != 0) << offset);
++b;
}
++y;
}
}
// Functions for RGB565 format
STATIC void rgb565_setpixel(const mp_obj_framebuf_t *fb, int x, int y, uint32_t color) {
((uint16_t*)fb->buf)[x + y * fb->stride] = color;
}
STATIC uint32_t rgb565_getpixel(const mp_obj_framebuf_t *fb, int x, int y) {
return ((uint16_t*)fb->buf)[x + y * fb->stride];
}
STATIC void rgb565_fill_rect(const mp_obj_framebuf_t *fb, int x, int y, int w, int h, uint32_t colour) {
uint16_t *b = &((uint16_t*)fb->buf)[x + y * fb->stride];
while (h--) {
for (int ww = w; ww; --ww) {
*b++ = colour;
}
b += fb->stride - w;
}
}
// constants for formats
#define FRAMEBUF_MVLSB (0)
#define FRAMEBUF_RGB565 (1)
STATIC mp_framebuf_p_t formats[] = {
[FRAMEBUF_MVLSB] = {mvlsb_setpixel, mvlsb_getpixel, mvlsb_fill_rect},
[FRAMEBUF_RGB565] = {rgb565_setpixel, rgb565_getpixel, rgb565_fill_rect},
};
static inline void setpixel(const mp_obj_framebuf_t *fb, int x, int y, uint32_t color) {
formats[fb->format].setpixel(fb, x, y, color);
}
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 (h < 1 || w < 1 || 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);
mp_obj_framebuf_t *o = m_new_obj(mp_obj_framebuf_t);
o->base.type = type;
o->buf_obj = args[0];
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_WRITE);
o->buf = bufinfo.buf;
o->width = mp_obj_get_int(args[1]);
o->height = mp_obj_get_int(args[2]);
o->format = mp_obj_get_int(args[3]);
if (n_args >= 5) {
o->stride = mp_obj_get_int(args[4]);
} else {
o->stride = o->width;
}
switch (o->format) {
case FRAMEBUF_MVLSB:
case FRAMEBUF_RGB565:
break;
default:
nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError,
"invalid format"));
}
return MP_OBJ_FROM_PTR(o);
}
STATIC mp_int_t framebuf_get_buffer(mp_obj_t self_in, mp_buffer_info_t *bufinfo, mp_uint_t flags) {
(void)flags;
mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(self_in);
bufinfo->buf = self->buf;
bufinfo->len = self->stride * self->height * (self->format == FRAMEBUF_RGB565 ? 2 : 1);
bufinfo->typecode = 'B'; // view framebuf as bytes
return 0;
}
STATIC mp_obj_t framebuf_fill(mp_obj_t self_in, mp_obj_t col_in) {
mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(self_in);
mp_int_t col = mp_obj_get_int(col_in);
formats[self->format].fill_rect(self, 0, 0, self->width, self->height, col);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(framebuf_fill_obj, framebuf_fill);
STATIC mp_obj_t framebuf_fill_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 width = mp_obj_get_int(args[3]);
mp_int_t height = mp_obj_get_int(args[4]);
mp_int_t color = mp_obj_get_int(args[5]);
fill_rect(self, x, y, width, height, color);
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_fill_rect_obj, 6, 6, framebuf_fill_rect);
STATIC mp_obj_t framebuf_pixel(size_t n_args, const mp_obj_t *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]);
if (0 <= x && x < self->width && 0 <= y && y < self->height) {
if (n_args == 3) {
// get
return MP_OBJ_NEW_SMALL_INT(getpixel(self, x, y));
} else {
// set
setpixel(self, x, y, mp_obj_get_int(args[3]));
}
}
return mp_const_none;
}
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) {
if (0 <= y1 && y1 < self->width && 0 <= x1 && x1 < self->height) {
setpixel(self, y1, x1, col);
}
} else {
if (0 <= x1 && x1 < self->width && 0 <= y1 && y1 < self->height) {
setpixel(self, x1, y1, col);
}
}
while (e >= 0) {
y1 += sy;
e -= 2 * dx;
}
x1 += sx;
e += 2 * dy;
}
if (0 <= x2 && x2 < self->width && 0 <= y2 && y2 < self->height) {
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]);
mp_int_t x = mp_obj_get_int(args[2]);
mp_int_t y = mp_obj_get_int(args[3]);
mp_int_t key = -1;
if (n_args > 4) {
key = mp_obj_get_int(args[4]);
}
if (
(x >= self->width) ||
(y >= self->height) ||
(-x >= source->width) ||
(-y >= source->height)
) {
// Out of bounds, no-op.
return mp_const_none;
}
// Clip.
int x0 = MAX(0, x);
int y0 = MAX(0, y);
int x1 = MAX(0, -x);
int y1 = MAX(0, -y);
int x0end = MIN(self->width, x + source->width);
int y0end = MIN(self->height, y + source->height);
uint32_t color;
for (; y0 < y0end; ++y0) {
int cx1 = x1;
for (int cx0 = x0; cx0 < x0end; ++cx0) {
color = getpixel(source, cx1, y1);
if (color != key) {
setpixel(self, cx0, y0, color);
}
++cx1;
}
++y1;
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_blit_obj, 4, 5, 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);
mp_int_t xstep = mp_obj_get_int(xstep_in);
mp_int_t ystep = mp_obj_get_int(ystep_in);
int sx, y, xend, yend, dx, dy;
if (xstep < 0) {
sx = 0;
xend = self->width + xstep;
dx = 1;
} else {
sx = self->width - 1;
xend = xstep - 1;
dx = -1;
}
if (ystep < 0) {
y = 0;
yend = self->height + ystep;
dy = 1;
} else {
y = self->height - 1;
yend = ystep - 1;
dy = -1;
}
for (; y != yend; y += dy) {
for (int x = sx; x != xend; x += dx) {
setpixel(self, x, y, getpixel(self, x - xstep, y - ystep));
}
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(framebuf_scroll_obj, framebuf_scroll);
STATIC mp_obj_t framebuf_text(size_t n_args, const mp_obj_t *args) {
// extract arguments
mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
const char *str = mp_obj_str_get_str(args[1]);
mp_int_t x0 = mp_obj_get_int(args[2]);
mp_int_t y0 = mp_obj_get_int(args[3]);
mp_int_t col = 1;
if (n_args >= 5) {
col = mp_obj_get_int(args[4]);
}
// loop over chars
for (; *str; ++str) {
// get char and make sure its in range of font
int chr = *(uint8_t*)str;
if (chr < 32 || chr > 127) {
chr = 127;
}
// get char data
const uint8_t *chr_data = &font_petme128_8x8[(chr - 32) * 8];
// loop over char data
for (int j = 0; j < 8; j++, x0++) {
if (0 <= x0 && x0 < self->width) { // clip x
uint vline_data = chr_data[j]; // each byte is a column of 8 pixels, LSB at top
for (int y = y0; vline_data; vline_data >>= 1, y++) { // scan over vertical column
if (vline_data & 1) { // only draw if pixel set
if (0 <= y && y < self->height) { // clip y
setpixel(self, x0, y, col);
}
}
}
}
}
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_text_obj, 4, 5, framebuf_text);
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) },
};
STATIC MP_DEFINE_CONST_DICT(framebuf_locals_dict, framebuf_locals_dict_table);
STATIC const mp_obj_type_t mp_type_framebuf = {
{ &mp_type_type },
.name = MP_QSTR_FrameBuffer,
.make_new = framebuf_make_new,
.buffer_p = { .get_buffer = framebuf_get_buffer },
.locals_dict = (mp_obj_t)&framebuf_locals_dict,
};
// this factory function is provided for backwards compatibility with old FrameBuffer1 class
STATIC mp_obj_t legacy_framebuffer1(size_t n_args, const mp_obj_t *args) {
mp_obj_framebuf_t *o = m_new_obj(mp_obj_framebuf_t);
o->base.type = &mp_type_framebuf;
mp_buffer_info_t bufinfo;
mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_WRITE);
o->buf = bufinfo.buf;
o->width = mp_obj_get_int(args[1]);
o->height = mp_obj_get_int(args[2]);
o->format = FRAMEBUF_MVLSB;
if (n_args >= 4) {
o->stride = mp_obj_get_int(args[3]);
} else {
o->stride = o->width;
}
return MP_OBJ_FROM_PTR(o);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(legacy_framebuffer1_obj, 3, 4, legacy_framebuffer1);
STATIC const mp_rom_map_elem_t framebuf_module_globals_table[] = {
{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_framebuf) },
{ MP_ROM_QSTR(MP_QSTR_FrameBuffer), MP_ROM_PTR(&mp_type_framebuf) },
{ MP_ROM_QSTR(MP_QSTR_FrameBuffer1), MP_ROM_PTR(&legacy_framebuffer1_obj) },
{ MP_ROM_QSTR(MP_QSTR_MVLSB), MP_OBJ_NEW_SMALL_INT(FRAMEBUF_MVLSB) },
{ MP_ROM_QSTR(MP_QSTR_RGB565), MP_OBJ_NEW_SMALL_INT(FRAMEBUF_RGB565) },
};
STATIC MP_DEFINE_CONST_DICT(framebuf_module_globals, framebuf_module_globals_table);
const mp_obj_module_t mp_module_framebuf = {
.base = { &mp_type_module },
.globals = (mp_obj_dict_t*)&framebuf_module_globals,
};
#endif // MICROPY_PY_FRAMEBUF
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