--- /dev/null
+/*
+ * QEMU VNC display driver: Zlib Run-length Encoding (ZRLE)
+ *
+ * From libvncserver/libvncserver/zrle.c
+ * Copyright (C) 2002 RealVNC Ltd. All Rights Reserved.
+ * Copyright (C) 2003 Sun Microsystems, Inc.
+ *
+ * Copyright (C) 2010 Corentin Chary <corentin.chary@gmail.com>
+ *
+ * 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 "vnc.h"
+#include "vnc-enc-zrle.h"
+
+static const int bits_per_packed_pixel[] = {
+ 0, 1, 2, 2, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4
+};
+
+
+static void vnc_zrle_start(VncState *vs)
+{
+ buffer_reset(&vs->zrle.zrle);
+
+ /* make the output buffer be the zlib buffer, so we can compress it later */
+ vs->zrle.tmp = vs->output;
+ vs->output = vs->zrle.zrle;
+}
+
+static void vnc_zrle_stop(VncState *vs)
+{
+ /* switch back to normal output/zlib buffers */
+ vs->zrle.zrle = vs->output;
+ vs->output = vs->zrle.tmp;
+}
+
+static void *zrle_convert_fb(VncState *vs, int x, int y, int w, int h,
+ int bpp)
+{
+ Buffer tmp;
+
+ buffer_reset(&vs->zrle.fb);
+ buffer_reserve(&vs->zrle.fb, w * h * bpp + bpp);
+
+ tmp = vs->output;
+ vs->output = vs->zrle.fb;
+
+ vnc_raw_send_framebuffer_update(vs, x, y, w, h);
+
+ vs->zrle.fb = vs->output;
+ vs->output = tmp;
+ return vs->zrle.fb.buffer;
+}
+
+static int zrle_compress_data(VncState *vs, int level)
+{
+ z_streamp zstream = &vs->zrle.stream;
+
+ buffer_reset(&vs->zrle.zlib);
+
+ if (zstream->opaque != vs) {
+ int err;
+
+ zstream->zalloc = vnc_zlib_zalloc;
+ zstream->zfree = vnc_zlib_zfree;
+
+ err = deflateInit2(zstream, level, Z_DEFLATED, MAX_WBITS,
+ MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
+
+ if (err != Z_OK) {
+ fprintf(stderr, "VNC: error initializing zlib\n");
+ return -1;
+ }
+
+ zstream->opaque = vs;
+ }
+
+ /* reserve memory in output buffer */
+ buffer_reserve(&vs->zrle.zlib, vs->zrle.zrle.offset + 64);
+
+ /* set pointers */
+ zstream->next_in = vs->zrle.zrle.buffer;
+ zstream->avail_in = vs->zrle.zrle.offset;
+ zstream->next_out = vs->zrle.zlib.buffer + vs->zrle.zlib.offset;
+ zstream->avail_out = vs->zrle.zlib.capacity - vs->zrle.zlib.offset;
+ zstream->data_type = Z_BINARY;
+
+ /* start encoding */
+ if (deflate(zstream, Z_SYNC_FLUSH) != Z_OK) {
+ fprintf(stderr, "VNC: error during zrle compression\n");
+ return -1;
+ }
+
+ vs->zrle.zlib.offset = vs->zrle.zlib.capacity - zstream->avail_out;
+ return vs->zrle.zlib.offset;
+}
+
+/* Try to work out whether to use RLE and/or a palette. We do this by
+ * estimating the number of bytes which will be generated and picking the
+ * method which results in the fewest bytes. Of course this may not result
+ * in the fewest bytes after compression... */
+static void zrle_choose_palette_rle(VncState *vs, int w, int h,
+ VncPalette *palette, int bpp_out,
+ int runs, int single_pixels,
+ int zywrle_level,
+ bool *use_rle, bool *use_palette)
+{
+ size_t estimated_bytes;
+ size_t plain_rle_bytes;
+
+ *use_palette = *use_rle = false;
+
+ estimated_bytes = w * h * (bpp_out / 8); /* start assuming raw */
+
+ if (bpp_out != 8) {
+ if (zywrle_level > 0 && !(zywrle_level & 0x80))
+ estimated_bytes >>= zywrle_level;
+ }
+
+ plain_rle_bytes = ((bpp_out / 8) + 1) * (runs + single_pixels);
+
+ if (plain_rle_bytes < estimated_bytes) {
+ *use_rle = true;
+ estimated_bytes = plain_rle_bytes;
+ }
+
+ if (palette_size(palette) < 128) {
+ int palette_rle_bytes;
+
+ palette_rle_bytes = (bpp_out / 8) * palette_size(palette);
+ palette_rle_bytes += 2 * runs + single_pixels;
+
+ if (palette_rle_bytes < estimated_bytes) {
+ *use_rle = true;
+ *use_palette = true;
+ estimated_bytes = palette_rle_bytes;
+ }
+
+ if (palette_size(palette) < 17) {
+ int packed_bytes;
+
+ packed_bytes = (bpp_out / 8) * palette_size(palette);
+ packed_bytes += w * h *
+ bits_per_packed_pixel[palette_size(palette)-1] / 8;
+
+ if (packed_bytes < estimated_bytes) {
+ *use_rle = false;
+ *use_palette = true;
+ estimated_bytes = packed_bytes;
+ }
+ }
+ }
+}
+
+static void zrle_write_u32(VncState *vs, uint32_t value)
+{
+ vnc_write(vs, (uint8_t *)&value, 4);
+}
+
+static void zrle_write_u24a(VncState *vs, uint32_t value)
+{
+ vnc_write(vs, (uint8_t *)&value, 3);
+}
+
+static void zrle_write_u24b(VncState *vs, uint32_t value)
+{
+ vnc_write(vs, ((uint8_t *)&value) + 1, 3);
+}
+
+static void zrle_write_u16(VncState *vs, uint16_t value)
+{
+ vnc_write(vs, (uint8_t *)&value, 2);
+}
+
+static void zrle_write_u8(VncState *vs, uint8_t value)
+{
+ vnc_write_u8(vs, value);
+}
+
+#define ENDIAN_LITTLE 0
+#define ENDIAN_BIG 1
+#define ENDIAN_NO 2
+
+#define ZRLE_BPP 8
+#define ZYWRLE_ENDIAN ENDIAN_NO
+#include "vnc-enc-zrle-template.c"
+#undef ZRLE_BPP
+
+#define ZRLE_BPP 15
+#undef ZYWRLE_ENDIAN
+#define ZYWRLE_ENDIAN ENDIAN_LITTLE
+#include "vnc-enc-zrle-template.c"
+
+#undef ZYWRLE_ENDIAN
+#define ZYWRLE_ENDIAN ENDIAN_BIG
+#include "vnc-enc-zrle-template.c"
+
+#undef ZRLE_BPP
+#define ZRLE_BPP 16
+#undef ZYWRLE_ENDIAN
+#define ZYWRLE_ENDIAN ENDIAN_LITTLE
+#include "vnc-enc-zrle-template.c"
+
+#undef ZYWRLE_ENDIAN
+#define ZYWRLE_ENDIAN ENDIAN_BIG
+#include "vnc-enc-zrle-template.c"
+
+#undef ZRLE_BPP
+#define ZRLE_BPP 32
+#undef ZYWRLE_ENDIAN
+#define ZYWRLE_ENDIAN ENDIAN_LITTLE
+#include "vnc-enc-zrle-template.c"
+
+#undef ZYWRLE_ENDIAN
+#define ZYWRLE_ENDIAN ENDIAN_BIG
+#include "vnc-enc-zrle-template.c"
+
+#define ZRLE_COMPACT_PIXEL 24a
+#undef ZYWRLE_ENDIAN
+#define ZYWRLE_ENDIAN ENDIAN_LITTLE
+#include "vnc-enc-zrle-template.c"
+
+#undef ZYWRLE_ENDIAN
+#define ZYWRLE_ENDIAN ENDIAN_BIG
+#include "vnc-enc-zrle-template.c"
+
+#undef ZRLE_COMPACT_PIXEL
+#define ZRLE_COMPACT_PIXEL 24b
+#undef ZYWRLE_ENDIAN
+#define ZYWRLE_ENDIAN ENDIAN_LITTLE
+#include "vnc-enc-zrle-template.c"
+
+#undef ZYWRLE_ENDIAN
+#define ZYWRLE_ENDIAN ENDIAN_BIG
+#include "vnc-enc-zrle-template.c"
+#undef ZRLE_COMPACT_PIXEL
+#undef ZRLE_BPP
+
+static int zrle_send_framebuffer_update(VncState *vs, int x, int y,
+ int w, int h)
+{
+ bool be = vs->client_be;
+ size_t bytes;
+ int zywrle_level;
+
+ if (vs->zrle.type == VNC_ENCODING_ZYWRLE) {
+ if (!vs->vd->lossy || vs->tight.quality == (uint8_t)-1
+ || vs->tight.quality == 9) {
+ zywrle_level = 0;
+ vs->zrle.type = VNC_ENCODING_ZRLE;
+ } else if (vs->tight.quality < 3) {
+ zywrle_level = 3;
+ } else if (vs->tight.quality < 6) {
+ zywrle_level = 2;
+ } else {
+ zywrle_level = 1;
+ }
+ } else {
+ zywrle_level = 0;
+ }
+
+ vnc_zrle_start(vs);
+
+ switch (vs->client_pf.bytes_per_pixel) {
+ case 1:
+ zrle_encode_8ne(vs, x, y, w, h, zywrle_level);
+ break;
+
+ case 2:
+ if (vs->client_pf.gmax > 0x1F) {
+ if (be) {
+ zrle_encode_16be(vs, x, y, w, h, zywrle_level);
+ } else {
+ zrle_encode_16le(vs, x, y, w, h, zywrle_level);
+ }
+ } else {
+ if (be) {
+ zrle_encode_15be(vs, x, y, w, h, zywrle_level);
+ } else {
+ zrle_encode_15le(vs, x, y, w, h, zywrle_level);
+ }
+ }
+ break;
+
+ case 4:
+ {
+ bool fits_in_ls3bytes;
+ bool fits_in_ms3bytes;
+
+ fits_in_ls3bytes =
+ ((vs->client_pf.rmax << vs->client_pf.rshift) < (1 << 24) &&
+ (vs->client_pf.gmax << vs->client_pf.gshift) < (1 << 24) &&
+ (vs->client_pf.bmax << vs->client_pf.bshift) < (1 << 24));
+
+ fits_in_ms3bytes = (vs->client_pf.rshift > 7 &&
+ vs->client_pf.gshift > 7 &&
+ vs->client_pf.bshift > 7);
+
+ if ((fits_in_ls3bytes && !be) || (fits_in_ms3bytes && be)) {
+ if (be) {
+ zrle_encode_24abe(vs, x, y, w, h, zywrle_level);
+ } else {
+ zrle_encode_24ale(vs, x, y, w, h, zywrle_level);
+ }
+ } else if ((fits_in_ls3bytes && be) || (fits_in_ms3bytes && !be)) {
+ if (be) {
+ zrle_encode_24bbe(vs, x, y, w, h, zywrle_level);
+ } else {
+ zrle_encode_24ble(vs, x, y, w, h, zywrle_level);
+ }
+ } else {
+ if (be) {
+ zrle_encode_32be(vs, x, y, w, h, zywrle_level);
+ } else {
+ zrle_encode_32le(vs, x, y, w, h, zywrle_level);
+ }
+ }
+ }
+ break;
+ }
+
+ vnc_zrle_stop(vs);
+ bytes = zrle_compress_data(vs, Z_DEFAULT_COMPRESSION);
+ vnc_framebuffer_update(vs, x, y, w, h, vs->zrle.type);
+ vnc_write_u32(vs, bytes);
+ vnc_write(vs, vs->zrle.zlib.buffer, vs->zrle.zlib.offset);
+ return 1;
+}
+
+int vnc_zrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h)
+{
+ vs->zrle.type = VNC_ENCODING_ZRLE;
+ return zrle_send_framebuffer_update(vs, x, y, w, h);
+}
+
+int vnc_zywrle_send_framebuffer_update(VncState *vs, int x, int y, int w, int h)
+{
+ vs->zrle.type = VNC_ENCODING_ZYWRLE;
+ return zrle_send_framebuffer_update(vs, x, y, w, h);
+}
+
+void vnc_zrle_clear(VncState *vs)
+{
+ if (vs->zrle.stream.opaque) {
+ deflateEnd(&vs->zrle.stream);
+ }
+ buffer_free(&vs->zrle.zrle);
+ buffer_free(&vs->zrle.fb);
+ buffer_free(&vs->zrle.zlib);
+}
Code Review / kvmfornfv.git / blobdiff