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circuitpython/shared-module/gifio/GifWriter.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2021 Jeff Epler for Adafruit Industries
* Copyright (c) 2013-2021 Ibrahim Abdelkader <iabdalkader@openmv.io>
* Copyright (c) 2013-2021 Kwabena W. Agyeman <kwagyeman@openmv.io>
*
* 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 <string.h>
#include "py/gc.h"
#include "py/runtime.h"
#include "shared-module/gifio/GifWriter.h"
#include "shared-bindings/gifio/GifWriter.h"
#include "shared-bindings/displayio/ColorConverter.h"
#include "shared-bindings/util.h"
#define BLOCK_SIZE (126) // (2^7) - 2 // (DO NOT CHANGE!)
static void handle_error(gifio_gifwriter_t *self) {
if (self->error != 0) {
mp_raise_OSError(self->error);
}
}
static void flush_data(gifio_gifwriter_t *self) {
if (self->cur == 0) {
return;
}
int error = 0;
self->file_proto->write(self->file, self->data, self->cur, &error);
self->cur = 0;
if (error != 0) {
self->error = error;
}
}
// These "write" calls _MUST_ have enough buffer space available! This is
// ensured by allocating the proper buffer size in construct.
static void write_data(gifio_gifwriter_t *self, const void *data, size_t size) {
assert(self->cur + size <= self->size);
memcpy(self->data + self->cur, data, size);
self->cur += size;
}
static void write_byte(gifio_gifwriter_t *self, uint8_t value) {
write_data(self, &value, sizeof(value));
}
static void write_long(gifio_gifwriter_t *self, uint32_t value) {
write_data(self, &value, sizeof(value));
}
static void write_word(gifio_gifwriter_t *self, uint16_t value) {
write_data(self, &value, sizeof(value));
}
void shared_module_gifio_gifwriter_construct(gifio_gifwriter_t *self, mp_obj_t *file, int width, int height, displayio_colorspace_t colorspace, bool loop, bool dither, bool own_file) {
self->file = file;
self->file_proto = mp_get_stream_raise(file, MP_STREAM_OP_WRITE | MP_STREAM_OP_IOCTL);
if (self->file_proto->is_text) {
mp_raise_TypeError(MP_ERROR_TEXT("file must be a file opened in byte mode"));
}
self->width = width;
self->height = height;
self->colorspace = colorspace;
self->dither = dither;
self->own_file = own_file;
size_t nblocks = (width * height + 125) / 126;
self->size = nblocks * 128 + 4;
self->data = m_malloc(self->size);
self->cur = 0;
self->error = 0;
write_data(self, "GIF89a", 6);
write_word(self, width);
write_word(self, height);
write_data(self, (uint8_t []) {0xF6, 0x00, 0x00}, 3);
switch (colorspace) {
case DISPLAYIO_COLORSPACE_RGB565:
case DISPLAYIO_COLORSPACE_RGB565_SWAPPED:
case DISPLAYIO_COLORSPACE_BGR565:
case DISPLAYIO_COLORSPACE_BGR565_SWAPPED:
case DISPLAYIO_COLORSPACE_L8:
break;
default:
mp_raise_TypeError(MP_ERROR_TEXT("unsupported colorspace for GifWriter"));
}
bool color = (colorspace != DISPLAYIO_COLORSPACE_L8);
bool bgr = (colorspace == DISPLAYIO_COLORSPACE_BGR565 || colorspace == DISPLAYIO_COLORSPACE_BGR565_SWAPPED);
self->byteswap = (colorspace == DISPLAYIO_COLORSPACE_RGB565_SWAPPED || colorspace == DISPLAYIO_COLORSPACE_BGR565_SWAPPED);
if (color) {
for (int i = 0; i < 128; i++) {
int red = (int)(((((i & 0x60) >> 5) * 255) + 1.5) / 3);
int green = (int)(((((i & 0x1C) >> 2) * 255) + 3.5) / 7);
int blue = (int)((((i & 0x3) * 255) + 1.5) / 3);
if (bgr) {
write_data(self, (uint8_t []) {blue, red, green}, 3);
} else {
write_data(self, (uint8_t []) {red, green, blue}, 3);
}
}
} else {
for (int i = 0; i < 128; i++) {
int gray = (int)(((i * 255) + 63.5) / 127);
write_data(self, (uint8_t []) {gray, gray, gray}, 3);
}
}
if (loop) {
write_data(self, (uint8_t []) {'!', 0xFF, 0x0B}, 3);
write_data(self, "NETSCAPE2.0", 11);
write_data(self, (uint8_t []) {0x03, 0x01, 0x00, 0x00, 0x00}, 5);
}
flush_data(self);
handle_error(self);
}
bool shared_module_gifio_gifwriter_deinited(gifio_gifwriter_t *self) {
return !self->file;
}
void shared_module_gifio_gifwriter_check_for_deinit(gifio_gifwriter_t *self) {
if (shared_module_gifio_gifwriter_deinited(self)) {
raise_deinited_error();
}
}
void shared_module_gifio_gifwriter_deinit(gifio_gifwriter_t *self) {
if (!shared_module_gifio_gifwriter_deinited(self)) {
shared_module_gifio_gifwriter_close(self);
}
}
static const uint8_t rb_bayer[4][4] = {
{ 0, 33, 8, 42},
{50, 16, 58, 25},
{12, 46, 4, 37},
{63, 29, 54, 21}
};
static const uint8_t g_bayer[4][4] = {
{ 0, 16, 4, 20},
{24, 8, 28, 12},
{ 6, 22, 2, 18},
{31, 14, 26, 10}
};
void shared_module_gifio_gifwriter_add_frame(gifio_gifwriter_t *self, const mp_buffer_info_t *bufinfo, int16_t delay) {
if (delay) {
write_data(self, (uint8_t []) {'!', 0xF9, 0x04, 0x04}, 4);
write_word(self, delay);
write_word(self, 0); // end
}
write_byte(self, 0x2C);
write_long(self, 0);
write_word(self, self->width);
write_word(self, self->height);
write_data(self, (uint8_t []) {0x00, 0x07}, 2); // 7-bits
int pixel_count = self->width * self->height;
int blocks = (pixel_count + BLOCK_SIZE - 1) / BLOCK_SIZE;
uint8_t *data = self->data + self->cur;
if (self->colorspace == DISPLAYIO_COLORSPACE_L8) {
mp_get_index(&mp_type_memoryview, bufinfo->len, MP_OBJ_NEW_SMALL_INT(pixel_count - 1), false);
uint8_t *pixels = bufinfo->buf;
for (int i = 0; i < blocks; i++) {
assert(pixel_count >= 0);
int block_size = MIN(BLOCK_SIZE, pixel_count);
pixel_count -= block_size;
*data++ = 1 + block_size;
*data++ = 0x80;
for (int j = 0; j < block_size; j++) {
*data++ = (*pixels++) >> 1;
}
}
} else if (!self->dither) {
mp_get_index(&mp_type_memoryview, bufinfo->len, MP_OBJ_NEW_SMALL_INT(2 * pixel_count - 1), false);
uint16_t *pixels = bufinfo->buf;
for (int i = 0; i < blocks; i++) {
int block_size = MIN(BLOCK_SIZE, pixel_count);
pixel_count -= block_size;
*data++ = 1 + block_size;
*data++ = 0x80;
for (int j = 0; j < block_size; j++) {
int pixel = *pixels++;
if (self->byteswap) {
pixel = __builtin_bswap16(pixel);
}
int red = (pixel >> (11 + (5 - 2))) & 0x3;
int green = (pixel >> (5 + (6 - 3))) & 0x7;
int blue = (pixel >> (0 + (5 - 2))) & 0x3;
*data++ = (red << 5) | (green << 2) | blue;
}
}
} else {
mp_get_index(&mp_type_memoryview, bufinfo->len, MP_OBJ_NEW_SMALL_INT(2 * pixel_count - 1), false);
uint16_t *pixels = bufinfo->buf;
int x = 0, y = 0;
for (int i = 0; i < blocks; i++) {
int block_size = MIN(BLOCK_SIZE, pixel_count);
pixel_count -= block_size;
*data++ = 1 + block_size;
*data++ = 0x80;
for (int j = 0; j < block_size; j++) {
int pixel = *pixels++;
if (self->byteswap) {
pixel = __builtin_bswap16(pixel);
}
int red = (pixel >> 8) & 0xf8;
int green = (pixel >> 3) & 0xfc;
int blue = (pixel << 3) & 0xf8;
red = MAX(0, red - rb_bayer[x % 4][y % 4]);
green = MAX(0, green - g_bayer[x % 4][(y + 2) % 4]);
blue = MAX(0, blue - rb_bayer[(x + 2) % 4][y % 4]);
x++;
if (x == self->width) {
x = 0;
y++;
}
*data++ = ((red >> 1) & 0x60) | ((green >> 3) & 0x1c) | (blue >> 6);
}
}
}
self->cur = data - self->data;
write_data(self, (uint8_t []) {0x01, 0x81, 0x00}, 3); // end code
flush_data(self);
handle_error(self);
}
void shared_module_gifio_gifwriter_close(gifio_gifwriter_t *self) {
write_byte(self, ';');
flush_data(self);
int error = 0;
self->file_proto->ioctl(self->file, self->own_file ? MP_STREAM_CLOSE : MP_STREAM_FLUSH, 0, &error);
self->file = NULL;
if (error != 0) {
self->error = error;
}
handle_error(self);
}
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