djsundog
/
circuitpython
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
circuitpython/shared-module/bitmaptools/__init__.c

1124 lines
40 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

/*
* This file is part of the Micro Python project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Kevin Matocha, Jose David Montoya
*
* 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 "shared/runtime/interrupt_char.h"
#include "shared-bindings/bitmaptools/__init__.h"
#include "shared-bindings/displayio/Bitmap.h"
#include "shared-bindings/displayio/Palette.h"
#include "shared-bindings/displayio/ColorConverter.h"
#include "shared-module/displayio/Bitmap.h"
#include "py/mperrno.h"
#include "py/runtime.h"
#include "py/stream.h"
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#define BITMAP_DEBUG(...) (void)0
// #define BITMAP_DEBUG(...) mp_printf(&mp_plat_print, __VA_ARGS__)
void common_hal_bitmaptools_rotozoom(displayio_bitmap_t *self, int16_t ox, int16_t oy,
int16_t dest_clip0_x, int16_t dest_clip0_y,
int16_t dest_clip1_x, int16_t dest_clip1_y,
displayio_bitmap_t *source, int16_t px, int16_t py,
int16_t source_clip0_x, int16_t source_clip0_y,
int16_t source_clip1_x, int16_t source_clip1_y,
mp_float_t angle,
mp_float_t scale,
uint32_t skip_index, bool skip_index_none) {
// Copies region from source to the destination bitmap, including rotation,
// scaling and clipping of either the source or destination regions
//
// *self: destination bitmap
// ox: the (ox, oy) destination point where the source (px,py) point is placed
// oy:
// dest_clip0: (x,y) is the corner of the clip window on the destination bitmap
// dest_clip1: (x,y) is the other corner of the clip window of the destination bitmap
// *source: the source bitmap
// px: the (px, py) point of rotation of the source bitmap
// py:
// source_clip0: (x,y) is the corner of the clip window on the source bitmap
// source_clip1: (x,y) is the other of the clip window on the source bitmap
// angle: angle of rotation in radians, positive is clockwise
// scale: scale factor
// skip_index: color index that should be ignored (and not copied over)
// skip_index_none: if skip_index_none is True, then all color indexes should be copied
// (that is, no color indexes should be skipped)
// Copy complete "source" bitmap into "self" bitmap at location x,y in the "self"
// Add a boolean to determine if all values are copied, or only if non-zero
// If skip_value is encountered in the source bitmap, it will not be copied.
// If skip_value is `None`, then all pixels are copied.
// # Credit from https://github.com/wernsey/bitmap
// # MIT License from
// # * Copyright (c) 2017 Werner Stoop <wstoop@gmail.com>
// #
// # *
// # * #### `void bm_rotate_blit(Bitmap *dst, int ox, int oy, Bitmap *src, int px, int py, double angle, double scale);`
// # *
// # * Rotates a source bitmap `src` around a pivot point `px,py` and blits it onto a destination bitmap `dst`.
// # *
// # * The bitmap is positioned such that the point `px,py` on the source is at the offset `ox,oy` on the destination.
// # *
// # * The `angle` is clockwise, in radians. The bitmap is also scaled by the factor `scale`.
// #
// # void bm_rotate_blit(Bitmap *dst, int ox, int oy, Bitmap *src, int px, int py, double angle, double scale);
// # /*
// # Reference:
// # "Fast Bitmap Rotation and Scaling" By Steven Mortimer, Dr Dobbs' Journal, July 01, 2001
// # http://www.drdobbs.com/architecture-and-design/fast-bitmap-rotation-and-scaling/184416337
// # See also http://www.efg2.com/Lab/ImageProcessing/RotateScanline.htm
// # */
int16_t x, y;
int16_t minx = dest_clip1_x;
int16_t miny = dest_clip1_y;
int16_t maxx = dest_clip0_x;
int16_t maxy = dest_clip0_y;
mp_float_t sinAngle = MICROPY_FLOAT_C_FUN(sin)(angle);
mp_float_t cosAngle = MICROPY_FLOAT_C_FUN(cos)(angle);
mp_float_t dx, dy;
/* Compute the position of where each corner on the source bitmap
will be on the destination to get a bounding box for scanning */
dx = -cosAngle * px * scale + sinAngle * py * scale + ox;
dy = -sinAngle * px * scale - cosAngle * py * scale + oy;
if (dx < minx) {
minx = (int16_t)dx;
}
if (dx > maxx) {
maxx = (int16_t)dx;
}
if (dy < miny) {
miny = (int16_t)dy;
}
if (dy > maxy) {
maxy = (int16_t)dy;
}
dx = cosAngle * (source->width - px) * scale + sinAngle * py * scale + ox;
dy = sinAngle * (source->width - px) * scale - cosAngle * py * scale + oy;
if (dx < minx) {
minx = (int16_t)dx;
}
if (dx > maxx) {
maxx = (int16_t)dx;
}
if (dy < miny) {
miny = (int16_t)dy;
}
if (dy > maxy) {
maxy = (int16_t)dy;
}
dx = cosAngle * (source->width - px) * scale - sinAngle * (source->height - py) * scale + ox;
dy = sinAngle * (source->width - px) * scale + cosAngle * (source->height - py) * scale + oy;
if (dx < minx) {
minx = (int16_t)dx;
}
if (dx > maxx) {
maxx = (int16_t)dx;
}
if (dy < miny) {
miny = (int16_t)dy;
}
if (dy > maxy) {
maxy = (int16_t)dy;
}
dx = -cosAngle * px * scale - sinAngle * (source->height - py) * scale + ox;
dy = -sinAngle * px * scale + cosAngle * (source->height - py) * scale + oy;
if (dx < minx) {
minx = (int16_t)dx;
}
if (dx > maxx) {
maxx = (int16_t)dx;
}
if (dy < miny) {
miny = (int16_t)dy;
}
if (dy > maxy) {
maxy = (int16_t)dy;
}
/* Clipping */
if (minx < dest_clip0_x) {
minx = dest_clip0_x;
}
if (maxx > dest_clip1_x - 1) {
maxx = dest_clip1_x - 1;
}
if (miny < dest_clip0_y) {
miny = dest_clip0_y;
}
if (maxy > dest_clip1_y - 1) {
maxy = dest_clip1_y - 1;
}
mp_float_t dvCol = cosAngle / scale;
mp_float_t duCol = sinAngle / scale;
mp_float_t duRow = dvCol;
mp_float_t dvRow = -duCol;
mp_float_t startu = px - (ox * dvCol + oy * duCol);
mp_float_t startv = py - (ox * dvRow + oy * duRow);
mp_float_t rowu = startu + miny * duCol;
mp_float_t rowv = startv + miny * dvCol;
displayio_area_t dirty_area = {minx, miny, maxx + 1, maxy + 1, NULL};
displayio_bitmap_set_dirty_area(self, &dirty_area);
for (y = miny; y <= maxy; y++) {
mp_float_t u = rowu + minx * duRow;
mp_float_t v = rowv + minx * dvRow;
for (x = minx; x <= maxx; x++) {
if (u >= source_clip0_x && u < source_clip1_x && v >= source_clip0_y && v < source_clip1_y) {
uint32_t c = common_hal_displayio_bitmap_get_pixel(source, (int)u, (int)v);
if ((skip_index_none) || (c != skip_index)) {
displayio_bitmap_write_pixel(self, x, y, c);
}
}
u += duRow;
v += dvRow;
}
rowu += duCol;
rowv += dvCol;
}
}
void common_hal_bitmaptools_fill_region(displayio_bitmap_t *destination,
int16_t x1, int16_t y1,
int16_t x2, int16_t y2,
uint32_t value) {
// writes the value (a bitmap color index) into a bitmap in the specified rectangular region
//
// input checks should ensure that x1 < x2 and y1 < y2 and are within the bitmap region
displayio_area_t area = { x1, y1, x2, y2, NULL };
displayio_area_canon(&area);
displayio_area_t bitmap_area = { 0, 0, destination->width, destination->height, NULL };
displayio_area_compute_overlap(&area, &bitmap_area, &area);
// update the dirty rectangle
displayio_bitmap_set_dirty_area(destination, &area);
int16_t x, y;
for (x = area.x1; x < area.x2; x++) {
for (y = area.y1; y < area.y2; y++) {
displayio_bitmap_write_pixel(destination, x, y, value);
}
}
}
void common_hal_bitmaptools_boundary_fill(displayio_bitmap_t *destination,
int16_t x, int16_t y,
uint32_t fill_color_value, uint32_t replaced_color_value) {
if (fill_color_value == replaced_color_value) {
// There is nothing to do
return;
}
uint32_t current_point_color_value;
// the list of points that we'll check
mp_obj_t fill_area = mp_obj_new_list(0, NULL);
// first point is the one user passed in
mp_obj_t point[] = { mp_obj_new_int(x), mp_obj_new_int(y) };
mp_obj_list_append(
fill_area,
mp_obj_new_tuple(2, point)
);
int16_t minx = x;
int16_t miny = y;
int16_t maxx = x;
int16_t maxy = y;
if (replaced_color_value == INT_MAX) {
current_point_color_value = common_hal_displayio_bitmap_get_pixel(
destination,
mp_obj_get_int(point[0]),
mp_obj_get_int(point[1]));
replaced_color_value = (uint32_t)current_point_color_value;
}
mp_obj_t *fill_points;
size_t list_length = 0;
mp_obj_list_get(fill_area, &list_length, &fill_points);
mp_obj_t current_point;
size_t tuple_len = 0;
mp_obj_t *tuple_items;
int cur_x, cur_y;
// while there are still points to check
while (list_length > 0) {
mp_obj_list_get(fill_area, &list_length, &fill_points);
current_point = mp_obj_list_pop(fill_area, 0);
mp_obj_tuple_get(current_point, &tuple_len, &tuple_items);
current_point_color_value = common_hal_displayio_bitmap_get_pixel(
destination,
mp_obj_get_int(tuple_items[0]),
mp_obj_get_int(tuple_items[1]));
// if the current point is not background color ignore it
if (current_point_color_value != replaced_color_value) {
mp_obj_list_get(fill_area, &list_length, &fill_points);
continue;
}
cur_x = mp_obj_int_get_checked(tuple_items[0]);
cur_y = mp_obj_int_get_checked(tuple_items[1]);
if (cur_x < minx) {
minx = (int16_t)cur_x;
}
if (cur_x > maxx) {
maxx = (int16_t)cur_x;
}
if (cur_y < miny) {
miny = (int16_t)cur_y;
}
if (cur_y > maxy) {
maxy = (int16_t)cur_y;
}
// fill the current point with fill color
displayio_bitmap_write_pixel(
destination,
mp_obj_get_int(tuple_items[0]),
mp_obj_get_int(tuple_items[1]),
fill_color_value);
// add all 4 surrounding points to the list to check
// ignore points outside of the bitmap
if (mp_obj_int_get_checked(tuple_items[1]) - 1 >= 0) {
mp_obj_t above_point[] = {
tuple_items[0],
MP_OBJ_NEW_SMALL_INT(mp_obj_int_get_checked(tuple_items[1]) - 1)
};
mp_obj_list_append(
fill_area,
mp_obj_new_tuple(2, above_point));
}
// ignore points outside of the bitmap
if (mp_obj_int_get_checked(tuple_items[0]) - 1 >= 0) {
mp_obj_t left_point[] = {
MP_OBJ_NEW_SMALL_INT(mp_obj_int_get_checked(tuple_items[0]) - 1),
tuple_items[1]
};
mp_obj_list_append(
fill_area,
mp_obj_new_tuple(2, left_point));
}
// ignore points outside of the bitmap
if (mp_obj_int_get_checked(tuple_items[0]) + 1 < destination->width) {
mp_obj_t right_point[] = {
MP_OBJ_NEW_SMALL_INT(mp_obj_int_get_checked(tuple_items[0]) + 1),
tuple_items[1]
};
mp_obj_list_append(
fill_area,
mp_obj_new_tuple(2, right_point));
}
// ignore points outside of the bitmap
if (mp_obj_int_get_checked(tuple_items[1]) + 1 < destination->height) {
mp_obj_t below_point[] = {
tuple_items[0],
MP_OBJ_NEW_SMALL_INT(mp_obj_int_get_checked(tuple_items[1]) + 1)
};
mp_obj_list_append(
fill_area,
mp_obj_new_tuple(2, below_point));
}
mp_obj_list_get(fill_area, &list_length, &fill_points);
RUN_BACKGROUND_TASKS;
if (mp_hal_is_interrupted()) {
return;
}
}
// set dirty the area so displayio will draw
displayio_area_t area = { minx, miny, maxx + 1, maxy + 1, NULL};
displayio_bitmap_set_dirty_area(destination, &area);
}
STATIC void draw_line(displayio_bitmap_t *destination,
int16_t x0, int16_t y0,
int16_t x1, int16_t y1,
uint32_t value) {
int16_t temp, x, y;
if (x0 == x1) { // vertical line
if (y0 > y1) { // ensure y1 > y0
temp = y0;
y0 = y1;
y1 = temp;
}
y0 = MAX(0, y0); // only draw inside bitmap
y1 = MIN(y1, destination->height - 1);
for (y = y0; y < (y1 + 1); y++) { // write a horizontal line
displayio_bitmap_write_pixel(destination, x0, y, value);
}
} else if (y0 == y1) { // horizontal line
if (x0 > x1) { // ensure y1 > y0
temp = x0;
x0 = x1;
x1 = temp;
}
x0 = MAX(0, x0); // only draw inside bitmap
x1 = MIN(x1, destination->width - 1);
for (x = x0; x < (x1 + 1); x++) { // write a horizontal line
displayio_bitmap_write_pixel(destination, x, y0, value);
}
} else {
bool steep;
steep = (abs(y1 - y0) > abs(x1 - x0));
if (steep) { // flip x0<->y0 and x1<->y1
temp = x0;
x0 = y0;
y0 = temp;
temp = x1;
x1 = y1;
y1 = temp;
}
if (x0 > x1) { // flip x0<->x1 and y0<->y1
temp = x0;
x0 = x1;
x1 = temp;
temp = y0;
y0 = y1;
y1 = temp;
}
int16_t dx, dy, ystep;
dx = x1 - x0;
dy = abs(y1 - y0);
mp_float_t err = dx / 2;
if (y0 < y1) {
ystep = 1;
} else {
ystep = -1;
}
for (x = x0; x < (x1 + 1); x++) {
if (steep) {
displayio_bitmap_write_pixel(destination, y0, x, value);
} else {
displayio_bitmap_write_pixel(destination, x, y0, value);
}
err -= dy;
if (err < 0) {
y0 += ystep;
err += dx;
}
}
}
}
void common_hal_bitmaptools_draw_line(displayio_bitmap_t *destination,
int16_t x0, int16_t y0,
int16_t x1, int16_t y1,
uint32_t value) {
//
// adapted from Adafruit_CircuitPython_Display_Shapes.Polygon._line
//
// update the dirty rectangle
int16_t xbb0, xbb1, ybb0, ybb1;
if (x0 < x1) {
xbb0 = x0;
xbb1 = x1 + 1;
} else {
xbb0 = x1;
xbb1 = x0 + 1;
}
if (y0 < y1) {
ybb0 = y0;
ybb1 = y1 + 1;
} else {
ybb0 = y1;
ybb1 = y0 + 1;
}
displayio_area_t area = { xbb0, ybb0, xbb1, ybb1, NULL };
displayio_area_t bitmap_area = { 0, 0, destination->width, destination->height, NULL };
displayio_area_compute_overlap(&area, &bitmap_area, &area);
displayio_bitmap_set_dirty_area(destination, &area);
draw_line(destination, x0, y0, x1, y1, value);
}
STATIC int32_t ith(void *data, size_t i, int element_size) {
switch (element_size) {
default:
case 1:
return *((int8_t *)data + i);
case 2:
return *((int16_t *)data + i);
case 4:
return *((int32_t *)data + i);
}
}
void common_hal_bitmaptools_draw_polygon(displayio_bitmap_t *destination, void *xs, void *ys, size_t points_len, int point_size, uint32_t value, bool close) {
int16_t x0, y0, xmin, xmax, ymin, ymax, xprev, yprev, x, y;
x0 = ith(xs, 0, point_size);
xmin = x0;
xmax = x0;
xprev = x0;
y0 = ith(ys, 0, point_size);
ymin = y0;
ymax = y0;
yprev = y0;
for (size_t i = 1; i < points_len; i++) {
x = ith(xs, i, point_size);
y = ith(ys, i, point_size);
draw_line(destination, xprev, yprev, x, y, value);
xprev = x;
yprev = y;
xmin = MIN(xmin, x);
xmax = MAX(xmax, x);
ymin = MIN(ymin, y);
ymax = MAX(ymax, y);
}
if (close) {
draw_line(destination, xprev, yprev, x0, y0, value);
}
displayio_area_t area = { xmin, ymin, xmax, ymax, NULL };
displayio_area_t bitmap_area = { 0, 0, destination->width, destination->height, NULL };
displayio_area_compute_overlap(&area, &bitmap_area, &area);
displayio_bitmap_set_dirty_area(destination, &area);
}
void common_hal_bitmaptools_arrayblit(displayio_bitmap_t *self, void *data, int element_size, int x1, int y1, int x2, int y2, bool skip_specified, uint32_t skip_value) {
uint32_t mask = (1 << common_hal_displayio_bitmap_get_bits_per_value(self)) - 1;
for (int y = y1; y < y2; y++) {
for (int x = x1; x < x2; x++) {
uint32_t value;
switch (element_size) {
default:
case 1:
value = *(uint8_t *)data;
data = (void *)((uint8_t *)data + 1);
break;
case 2:
value = *(uint16_t *)data;
data = (void *)((uint16_t *)data + 1);
break;
case 4:
value = *(uint32_t *)data;
data = (void *)((uint32_t *)data + 1);
break;
}
if (!skip_specified || value != skip_value) {
displayio_bitmap_write_pixel(self, x, y, value & mask);
}
}
}
displayio_area_t area = { x1, y1, x2, y2, NULL };
displayio_bitmap_set_dirty_area(self, &area);
}
void common_hal_bitmaptools_readinto(displayio_bitmap_t *self, mp_obj_t *file, int element_size, int bits_per_pixel, bool reverse_pixels_in_element, bool swap_bytes, bool reverse_rows) {
uint32_t mask = (1 << common_hal_displayio_bitmap_get_bits_per_value(self)) - 1;
const mp_stream_p_t *file_proto = mp_get_stream_raise(file, MP_STREAM_OP_READ);
displayio_area_t a = {0, 0, self->width, self->height, NULL};
displayio_bitmap_set_dirty_area(self, &a);
size_t elements_per_row = (self->width * bits_per_pixel + element_size * 8 - 1) / (element_size * 8);
size_t rowsize = element_size * elements_per_row;
size_t rowsize_in_u32 = (rowsize + sizeof(uint32_t) - 1) / sizeof(uint32_t);
size_t rowsize_in_u16 = (rowsize + sizeof(uint16_t) - 1) / sizeof(uint16_t);
for (int y = 0; y < self->height; y++) {
uint32_t rowdata32[rowsize_in_u32];
uint16_t *rowdata16 = (uint16_t *)rowdata32;
uint8_t *rowdata8 = (uint8_t *)rowdata32;
const int y_draw = reverse_rows ? (self->height) - 1 - y : y;
int error = 0;
mp_uint_t bytes_read = file_proto->read(file, rowdata32, rowsize, &error);
if (error) {
mp_raise_OSError(error);
}
if (bytes_read != rowsize) {
mp_raise_msg(&mp_type_EOFError, NULL);
}
if (swap_bytes) {
switch (element_size) {
case 2:
for (size_t i = 0; i < rowsize_in_u16; i++) {
rowdata16[i] = __builtin_bswap16(rowdata16[i]);
}
break;
case 4:
for (size_t i = 0; i < rowsize_in_u32; i++) {
rowdata32[i] = __builtin_bswap32(rowdata32[i]);
}
default:
break;
}
}
for (int x = 0; x < self->width; x++) {
int value = 0;
switch (bits_per_pixel) {
case 1: {
int byte_offset = x / 8;
int bit_offset = reverse_pixels_in_element ? (7 - x % 8) : x % 8;
value = (rowdata8[byte_offset] >> bit_offset) & 1;
break;
}
case 2: {
int byte_offset = x / 4;
int bit_offset = 2 * (reverse_pixels_in_element ? (3 - x % 4) : x % 4);
value = (rowdata8[byte_offset] >> bit_offset) & 3;
break;
}
case 4: {
int byte_offset = x / 2;
int bit_offset = 4 * (reverse_pixels_in_element ? (1 - x % 2) : x % 2);
value = (rowdata8[byte_offset] >> bit_offset) & 0xf;
break;
}
case 8:
value = rowdata8[x];
break;
case 16:
value = rowdata16[x];
break;
case 24:
value = (rowdata8[x * 3] << 16) | (rowdata8[x * 3 + 1] << 8) | rowdata8[x * 3 + 2];
break;
case 32:
value = rowdata32[x];
break;
}
displayio_bitmap_write_pixel(self, x, y_draw, value & mask);
}
}
}
typedef struct {
uint8_t count; // The number of items in terms[]
uint8_t mx; // the maximum of the absolute value of the dx values
uint8_t dl; // the scaled dither value applied to the pixel at distance [1,0]
struct { // dl is the scaled dither values applied to the pixel at [dx,dy]
int8_t dx, dy, dl;
} terms[];
} bitmaptools_dither_algorithm_info_t;
static bitmaptools_dither_algorithm_info_t atkinson = {
4, 2, 256 / 8, {
{2, 0, 256 / 8},
{-1, 1, 256 / 8},
{0, 1, 256 / 8},
{0, 2, 256 / 8},
}
};
static bitmaptools_dither_algorithm_info_t floyd_stenberg = {
3, 1, 7 * 256 / 16,
{
{-1, 1, 3 * 256 / 16},
{0, 1, 5 * 256 / 16},
{1, 1, 1 * 256 / 16},
}
};
bitmaptools_dither_algorithm_info_t *algorithms[] = {
[DITHER_ALGORITHM_ATKINSON] = &atkinson,
[DITHER_ALGORITHM_FLOYD_STENBERG] = &floyd_stenberg,
};
enum {
SWAP_BYTES = 1 << 0,
SWAP_RB = 1 << 1,
};
STATIC void fill_row(displayio_bitmap_t *bitmap, int swap, int16_t *luminance_data, int y, int mx) {
if (y >= bitmap->height) {
return;
}
// zero out padding area
for (int i = 0; i < mx; i++) {
luminance_data[-mx + i] = 0;
luminance_data[bitmap->width + i] = 0;
}
if (bitmap->bits_per_value == 8) {
uint8_t *pixel_data = (uint8_t *)(bitmap->data + bitmap->stride * y);
for (int x = 0; x < bitmap->width; x++) {
*luminance_data++ = *pixel_data++;
}
} else {
uint16_t *pixel_data = (uint16_t *)(bitmap->data + bitmap->stride * y);
for (int x = 0; x < bitmap->width; x++) {
uint16_t pixel = *pixel_data++;
if (swap & SWAP_BYTES) {
pixel = __builtin_bswap16(pixel);
}
int r = (pixel >> 8) & 0xf8;
int g = (pixel >> 3) & 0xfc;
int b = (pixel << 3) & 0xf8;
if (swap & SWAP_RB) {
uint8_t tmp = r;
r = b;
b = tmp;
}
// ideal coefficients are around .299, .587, .114 (according to
// ppmtopnm), this differs from the 'other' luma-converting
// function in circuitpython (why?)
// we correct for the fact that the input ranges are 0..0xf8 (or
// 0xfc) rather than 0x00..0xff
// Check: (0xf8 * 78 + 0xfc * 154 + 0xf8 * 29) // 256 == 255
*luminance_data++ = (r * 78 + g * 154 + b * 29) / 256;
}
}
}
static void write_pixels(displayio_bitmap_t *bitmap, int y, bool *data) {
if (bitmap->bits_per_value == 1) {
uint32_t *pixel_data = (uint32_t *)(bitmap->data + bitmap->stride * y);
for (int i = 0; i < bitmap->width; i++) {
uint32_t p = 0;
for (int j = 0; j < 32; j++) {
p = (p << 1);
if (*data++) {
p |= 1;
}
}
*pixel_data++ = p;
}
} else {
uint16_t *pixel_data = (uint16_t *)(bitmap->data + bitmap->stride * y);
for (int i = 0; i < bitmap->width; i++) {
*pixel_data++ = *data++ ? 65535 : 0;
}
}
}
void common_hal_bitmaptools_dither(displayio_bitmap_t *dest_bitmap, displayio_bitmap_t *source_bitmap, displayio_colorspace_t colorspace, bitmaptools_dither_algorithm_t algorithm) {
int height = dest_bitmap->height, width = dest_bitmap->width;
int swap = 0;
if (colorspace == DISPLAYIO_COLORSPACE_RGB565_SWAPPED || colorspace == DISPLAYIO_COLORSPACE_BGR565_SWAPPED) {
swap |= SWAP_BYTES;
}
if (colorspace == DISPLAYIO_COLORSPACE_BGR565 || colorspace == DISPLAYIO_COLORSPACE_BGR565_SWAPPED) {
swap |= SWAP_RB;
}
bitmaptools_dither_algorithm_info_t *info = algorithms[algorithm];
// rowdata holds 3 rows of data. Each one is larger than the input
// bitmap's width, because `mx` extra pixels are allocated at the start and
// end of the row so that no conditionals are needed when storing the error data.
int16_t rowdata[(width + 2 * info->mx) * 3];
int16_t *rows[3] = {
rowdata + info->mx, rowdata + width + info->mx * 3, rowdata + 2 * width + info->mx * 5
};
// out holds one output row of pixels, and is padded to be a multiple of 32 so that the 1bpp storage loop can be simplified
bool out[(width + 31) / 32 * 32];
fill_row(source_bitmap, swap, rows[0], 0, info->mx);
fill_row(source_bitmap, swap, rows[1], 1, info->mx);
fill_row(source_bitmap, swap, rows[2], 2, info->mx);
int16_t err = 0;
for (int y = 0; y < height; y++) {
// Serpentine dither. Going left-to-right...
for (int x = 0; x < width; x++) {
int32_t pixel_in = rows[0][x] + err;
bool pixel_out = pixel_in >= 128;
out[x] = pixel_out;
err = pixel_in - (pixel_out ? 255 : 0);
for (int i = 0; i < info->count; i++) {
int x1 = x + info->terms[i].dx;
int dy = info->terms[i].dy;
rows[dy][x1] = ((info->terms[i].dl * err) / 256) + rows[dy][x1];
}
err = (err * info->dl) / 256;
}
write_pixels(dest_bitmap, y, out);
// Cycle the rows by shuffling pointers, this is faster than copying the data.
int16_t *tmp = rows[0];
rows[0] = rows[1];
rows[1] = rows[2];
rows[2] = tmp;
y++;
if (y == height) {
break;
}
fill_row(source_bitmap, swap, rows[2], y + 2, info->mx);
// Serpentine dither. Going right-to-left...
for (int x = width; x--;) {
int16_t pixel_in = rows[0][x] + err;
bool pixel_out = pixel_in >= 128;
out[x] = pixel_out;
err = pixel_in - (pixel_out ? 255 : 0);
for (int i = 0; i < info->count; i++) {
int x1 = x - info->terms[i].dx;
int dy = info->terms[i].dy;
rows[dy][x1] = ((info->terms[i].dl * err) / 256) + rows[dy][x1];
}
err = (err * info->dl) / 256;
}
write_pixels(dest_bitmap, y, out);
tmp = rows[0];
rows[0] = rows[1];
rows[1] = rows[2];
rows[2] = tmp;
fill_row(source_bitmap, swap, rows[2], y + 3, info->mx);
}
displayio_area_t a = { 0, 0, width, height, NULL };
displayio_bitmap_set_dirty_area(dest_bitmap, &a);
}
void common_hal_bitmaptools_alphablend(displayio_bitmap_t *dest, displayio_bitmap_t *source1, displayio_bitmap_t *source2, displayio_colorspace_t colorspace, mp_float_t factor1, mp_float_t factor2,
bitmaptools_blendmode_t blendmode, uint32_t skip_source1_index, bool skip_source1_index_none, uint32_t skip_source2_index, bool skip_source2_index_none) {
displayio_area_t a = {0, 0, dest->width, dest->height, NULL};
displayio_bitmap_set_dirty_area(dest, &a);
int ifactor1 = (int)(factor1 * 256);
int ifactor2 = (int)(factor2 * 256);
bool blend_source1, blend_source2;
if (colorspace == DISPLAYIO_COLORSPACE_L8) {
for (int y = 0; y < dest->height; y++) {
uint8_t *dptr = (uint8_t *)(dest->data + y * dest->stride);
uint8_t *sptr1 = (uint8_t *)(source1->data + y * source1->stride);
uint8_t *sptr2 = (uint8_t *)(source2->data + y * source2->stride);
int pixel;
for (int x = 0; x < dest->width; x++) {
blend_source1 = skip_source1_index_none || *sptr1 != (uint8_t)skip_source1_index;
blend_source2 = skip_source2_index_none || *sptr2 != (uint8_t)skip_source2_index;
if (blend_source1 && blend_source2) {
// Premultiply by the alpha factor
int sda = *sptr1++ *ifactor1;
int sca = *sptr2++ *ifactor2;
// Blend
int blend;
if (blendmode == BITMAPTOOLS_BLENDMODE_SCREEN) {
blend = sca + sda - (sca * sda / 65536);
} else {
blend = sca + sda * (256 - ifactor2) / 256;
}
// Divide by the alpha factor
pixel = (blend / (ifactor1 + ifactor2 - ifactor1 * ifactor2 / 256));
} else if (blend_source1) {
// Apply iFactor1 to source1 only
pixel = *sptr1++ *ifactor1 / 256;
} else if (blend_source2) {
// Apply iFactor2 to source1 only
pixel = *sptr2++ *ifactor2 / 256;
} else {
// Use the destination value
pixel = *dptr;
}
*dptr++ = MIN(255, MAX(0, pixel));
}
}
} else {
bool swap = (colorspace == DISPLAYIO_COLORSPACE_RGB565_SWAPPED) || (colorspace == DISPLAYIO_COLORSPACE_BGR565_SWAPPED);
uint16_t pixel;
for (int y = 0; y < dest->height; y++) {
uint16_t *dptr = (uint16_t *)(dest->data + y * dest->stride);
uint16_t *sptr1 = (uint16_t *)(source1->data + y * source1->stride);
uint16_t *sptr2 = (uint16_t *)(source2->data + y * source2->stride);
for (int x = 0; x < dest->width; x++) {
int spix1 = *sptr1++;
int spix2 = *sptr2++;
if (swap) {
spix1 = __builtin_bswap16(spix1);
spix2 = __builtin_bswap16(spix2);
}
const int r_mask = 0xf800; // (or b mask, if BGR)
const int g_mask = 0x07e0;
const int b_mask = 0x001f; // (or r mask, if BGR)
blend_source1 = skip_source1_index_none || spix1 != (int)skip_source1_index;
blend_source2 = skip_source2_index_none || spix2 != (int)skip_source2_index;
if (blend_source1 && blend_source2) {
// Blend based on the SVG alpha compositing specs
// https://dev.w3.org/SVG/modules/compositing/master/#alphaCompositing
int ifactor_blend = ifactor1 + ifactor2 - ifactor1 * ifactor2 / 256;
// Premultiply the colors by the alpha factor
int red_dca = ((spix1 & r_mask) >> 8) * ifactor1;
int grn_dca = ((spix1 & g_mask) >> 3) * ifactor1;
int blu_dca = ((spix1 & b_mask) << 3) * ifactor1;
int red_sca = ((spix2 & r_mask) >> 8) * ifactor2;
int grn_sca = ((spix2 & g_mask) >> 3) * ifactor2;
int blu_sca = ((spix2 & b_mask) << 3) * ifactor2;
int red_blend, grn_blend, blu_blend;
if (blendmode == BITMAPTOOLS_BLENDMODE_SCREEN) {
// Perform a screen blend Sca + Dca - Sca × Dca
red_blend = red_sca + red_dca - (red_sca * red_dca / 65536);
grn_blend = grn_sca + grn_dca - (grn_sca * grn_dca / 65536);
blu_blend = blu_sca + blu_dca - (blu_sca * blu_dca / 65536);
} else {
// Perform a normal (src-over) blend
red_blend = red_sca + red_dca * (256 - ifactor2) / 256;
grn_blend = grn_sca + grn_dca * (256 - ifactor2) / 256;
blu_blend = blu_sca + blu_dca * (256 - ifactor2) / 256;
}
// Divide by the alpha factor
int r = ((red_blend / ifactor_blend) << 8) & r_mask;
int g = ((grn_blend / ifactor_blend) << 3) & g_mask;
int b = ((blu_blend / ifactor_blend) >> 3) & b_mask;
// Clamp to the appropriate range
r = MIN(r_mask, MAX(0, r)) & r_mask;
g = MIN(g_mask, MAX(0, g)) & g_mask;
b = MIN(b_mask, MAX(0, b)) & b_mask;
pixel = r | g | b;
if (swap) {
pixel = __builtin_bswap16(pixel);
}
} else if (blend_source1) {
// Apply iFactor1 to source1 only
int r = (spix1 & r_mask) * ifactor1 / 256;
int g = (spix1 & g_mask) * ifactor1 / 256;
int b = (spix1 & b_mask) * ifactor1 / 256;
pixel = r | g | b;
} else if (blend_source2) {
// Apply iFactor2 to source1 only
int r = (spix2 & r_mask) * ifactor2 / 256;
int g = (spix2 & g_mask) * ifactor2 / 256;
int b = (spix2 & b_mask) * ifactor2 / 256;
pixel = r | g | b;
} else {
// Use the destination value
pixel = *dptr;
}
*dptr++ = pixel;
}
}
}
}
STATIC void draw_circle(displayio_bitmap_t *destination,
int16_t x, int16_t y,
int16_t radius, uint32_t value) {
int16_t d, yb;
mp_arg_validate_int_range(x, SHRT_MIN, SHRT_MAX, MP_QSTR_x);
mp_arg_validate_int_range(y, SHRT_MIN, SHRT_MAX, MP_QSTR_y);
x = MIN(x, destination->width);
x = MAX(0, x);
y = MIN(y, destination->height);
y = MAX(0, y);
BITMAP_DEBUG("x, y, radius (%4d, %4d, %4d)\n", x, y, radius);
yb = radius;
d = 3 - 2 * radius;
// Bresenham's circle algorithm
for (int xb = 0; xb <= yb; xb++) {
displayio_bitmap_write_pixel(destination, xb + x, yb + y, value);
displayio_bitmap_write_pixel(destination, -xb + x, -yb + y, value);
displayio_bitmap_write_pixel(destination, -xb + x, yb + y, value);
displayio_bitmap_write_pixel(destination, xb + x, -yb + y, value);
displayio_bitmap_write_pixel(destination, yb + x, xb + y, value);
displayio_bitmap_write_pixel(destination, -yb + x, xb + y, value);
displayio_bitmap_write_pixel(destination, -yb + x, -xb + y, value);
displayio_bitmap_write_pixel(destination, yb + x, -xb + y, value);
if (d <= 0) {
d = d + (4 * xb) + 6;
} else {
d = d + 4 * (xb - yb) + 10;
yb = yb - 1;
}
}
}
void common_hal_bitmaptools_draw_circle(displayio_bitmap_t *destination,
int16_t x, int16_t y,
int16_t radius,
uint32_t value) {
// update the dirty area
int16_t xbb0, xbb1, ybb0, ybb1;
xbb0 = x - radius;
xbb1 = x + radius;
ybb0 = y - radius;
ybb1 = y + radius;
displayio_area_t area = { xbb0, ybb0, xbb1, ybb1, NULL };
displayio_area_t bitmap_area = { 0, 0, destination->width, destination->height, NULL };
displayio_area_compute_overlap(&area, &bitmap_area, &area);
displayio_bitmap_set_dirty_area(destination, &area);
draw_circle(destination, x, y, radius, value);
}
void common_hal_bitmaptools_blit(displayio_bitmap_t *destination, displayio_bitmap_t *source, int16_t x, int16_t y,
int16_t x1, int16_t y1, int16_t x2, int16_t y2, uint32_t skip_source_index, bool skip_source_index_none, uint32_t skip_dest_index,
bool skip_dest_index_none) {
if (destination->read_only) {
mp_raise_RuntimeError(MP_ERROR_TEXT("Read-only"));
}
// Copy region of "source" bitmap into "destination" bitmap at location x,y in the "destination"
// If skip_value is encountered in the source bitmap, it will not be copied.
// If skip_value is `None`, then all pixels are copied.
// This function assumes input checks were performed for pixel index entries.
// Update the dirty area
int16_t dirty_x_max = (x + (x2 - x1));
if (dirty_x_max > destination->width) {
dirty_x_max = destination->width;
}
int16_t dirty_y_max = y + (y2 - y1);
if (dirty_y_max > destination->height) {
dirty_y_max = destination->height;
}
displayio_area_t a = { x, y, dirty_x_max, dirty_y_max, NULL};
displayio_bitmap_set_dirty_area(destination, &a);
bool x_reverse = false;
bool y_reverse = false;
// Add reverse direction option to protect blitting of destination bitmap back into destination bitmap
if (x > x1) {
x_reverse = true;
}
if (y > y1) {
y_reverse = true;
}
// simplest version - use internal functions for get/set pixels
for (int16_t i = 0; i < (x2 - x1); i++) {
const int xs_index = x_reverse ? ((x2) - i - 1) : x1 + i; // x-index into the source bitmap
const int xd_index = x_reverse ? ((x + (x2 - x1)) - i - 1) : x + i; // x-index into the destination bitmap
if ((xd_index >= 0) && (xd_index < destination->width)) {
for (int16_t j = 0; j < (y2 - y1); j++) {
const int ys_index = y_reverse ? ((y2) - j - 1) : y1 + j; // y-index into the source bitmap
const int yd_index = y_reverse ? ((y + (y2 - y1)) - j - 1) : y + j; // y-index into the destination bitmap
if ((yd_index >= 0) && (yd_index < destination->height)) {
uint32_t value = common_hal_displayio_bitmap_get_pixel(source, xs_index, ys_index);
if (skip_dest_index_none) { // if skip_dest_index is none, then only check source skip
if ((skip_source_index_none) || (value != skip_source_index)) { // write if skip_value_none is True
displayio_bitmap_write_pixel(destination, xd_index, yd_index, value);
}
} else { // check dest_value index against skip_dest_index and skip if they match
uint32_t dest_value = common_hal_displayio_bitmap_get_pixel(destination, xd_index, yd_index);
if (dest_value != skip_dest_index) {
if ((skip_source_index_none) || (value != skip_source_index)) { // write if skip_value_none is True
displayio_bitmap_write_pixel(destination, xd_index, yd_index, value);
}
}
}
}
}
}
}
}
Reference in New Issue View Git Blame Copy Permalink