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gifio: write block data directly into output buffer

This commit is contained in:
Jeff Epler 2021-10-27 09:37:05 -05:00
parent b881aec4c5
commit dc00226143
1 changed files with 9 additions and 8 deletions
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17
shared-module/gifio/GifWriter.c
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@ -175,8 +175,7 @@ void shared_module_gifio_gifwriter_add_frame(gifio_gifwriter_t *self, const mp_b
int pixel_count = self->width * self->height;
int blocks = (pixel_count + BLOCK_SIZE - 1) / BLOCK_SIZE;
uint8_t block_data[2 + BLOCK_SIZE];
block_data[1] = 0x80;
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);
@ -186,11 +185,11 @@ void shared_module_gifio_gifwriter_add_frame(gifio_gifwriter_t *self, const mp_b
assert(pixel_count >= 0);
int block_size = MIN(BLOCK_SIZE, pixel_count);
pixel_count -= block_size;
block_data[0] = 1 + block_size;
*data++ = 1 + block_size;
*data++ = 0x80;
for (int j = 0; j < block_size; j++) {
block_data[j + 2] = (*pixels++) >> 1;
*data++ = (*pixels++) >> 1;
}
write_data(self, block_data, 2 + block_size);
}
} else {
mp_get_index(&mp_type_memoryview, bufinfo->len, MP_OBJ_NEW_SMALL_INT(2 * pixel_count - 1), false);
@ -200,7 +199,8 @@ void shared_module_gifio_gifwriter_add_frame(gifio_gifwriter_t *self, const mp_b
int block_size = MIN(BLOCK_SIZE, pixel_count);
pixel_count -= block_size;
block_data[0] = 1 + block_size;
*data++ = 1 + block_size;
*data++ = 0x80;
for (int j = 0; j < block_size; j++) {
int pixel = *pixels++;
if (self->byteswap) {
@ -209,12 +209,13 @@ void shared_module_gifio_gifwriter_add_frame(gifio_gifwriter_t *self, const mp_b
int red = (pixel >> (11 + (5 - 2))) & 0x3;
int green = (pixel >> (5 + (6 - 3))) & 0x7;
int blue = (pixel >> (0 + (5 - 2))) & 0x3;
block_data[j + 2] = (red << 5) | (green << 2) | blue;
*data++ = (red << 5) | (green << 2) | blue;
}
write_data(self, block_data, 2 + block_size);
}
}
self->cur = data - self->data;
write_data(self, (uint8_t []) {0x01, 0x81, 0x00}, 3); // end code
flush_data(self);
handle_error(self);