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zrle: Extract deflate to function

tight-png
Andri Yngvason 2019-08-27 21:04:20 +00:00 committed by Andri Yngvason
parent 09d64dfbe6
commit 1fc4d436a9
1 changed files with 31 additions and 26 deletions
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57
src/zrle.c
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@ -164,12 +164,38 @@ void zrle_encode_tile(struct vec *dst, const struct rfb_pixel_format *dst_fmt,
dst->len += bytes_per_cpixel * width * height;
}
int zrle_deflate(struct vec* dst, const struct vec* src, z_stream* zs,
bool flush)
{
int r = Z_STREAM_ERROR;
zs->next_in = src->data;
zs->avail_in = src->len;
do {
if (dst->len == dst->cap && vec_reserve(dst, dst->cap * 2) < 0)
return -1;
zs->next_out = ((Bytef*)dst->data) + dst->len;
zs->avail_out = dst->cap - dst->len;
r = deflate(zs, flush ? Z_FINISH : Z_NO_FLUSH);
assert(r != Z_STREAM_ERROR);
dst->len = dst->cap - zs->avail_out;
} while (zs->avail_out == 0);
assert(zs->avail_in == 0);
assert(!flush || r == Z_STREAM_END);
return 0;
}
int zrle_encode_box(uv_stream_t *stream, const struct rfb_pixel_format *dst_fmt,
uint8_t *src, const struct rfb_pixel_format *src_fmt,
int x, int y, int stride, int width, int height)
{
int r = -1;
int zr = Z_STREAM_ERROR;
int bytes_per_cpixel = dst_fmt->depth / 8;
int chunk_size = 1 + bytes_per_cpixel * 64 * 64;
z_stream zs = { 0 };
@ -180,7 +206,7 @@ int zrle_encode_box(uv_stream_t *stream, const struct rfb_pixel_format *dst_fmt,
if (vec_init(&in, 1 + bytes_per_cpixel * 64 * 64) < 0)
goto failure;
if (vec_init(&out, bytes_per_cpixel * width * height * 2) < 0)
if (vec_init(&out, bytes_per_cpixel * width * height / 2) < 0)
goto failure;
r = deflateInit(&zs, Z_DEFAULT_COMPRESSION);
@ -206,32 +232,11 @@ int zrle_encode_box(uv_stream_t *stream, const struct rfb_pixel_format *dst_fmt,
((uint32_t*)src) + tile_x + tile_y * width,
src_fmt, stride, tile_width, tile_height);
zs.next_in = in.data;
zs.avail_in = in.len;
int flush = (i == n_tiles - 1) ? Z_FINISH : Z_NO_FLUSH;
do {
/*
r = vec_reserve(&out, out.len + chunk_size);
if (r < 0)
goto failure;
*/
zs.next_out = ((Bytef*)out.data) + out.len;
zs.avail_out = out.cap - out.len;
zr = deflate(&zs, flush);
assert(zr != Z_STREAM_ERROR);
out.len = out.cap - zs.avail_out;
} while (zs.avail_out == 0);
assert(zs.avail_in == 0);
r = zrle_deflate(&out, &in, &zs, i == n_tiles - 1);
if (r < 0)
goto failure;
}
assert(zr == Z_STREAM_END);
deflateEnd(&zs);
uint32_t *out_size = out.data;