diff options
Diffstat (limited to 'ui/vnc-enc-zrle.c')
| -rw-r--r-- | ui/vnc-enc-zrle.c | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/ui/vnc-enc-zrle.c b/ui/vnc-enc-zrle.c new file mode 100644 index 0000000..016a406 --- /dev/null +++ b/ui/vnc-enc-zrle.c @@ -0,0 +1,365 @@ +/* + * 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->clientds.flags & QEMU_BIG_ENDIAN_FLAG); + size_t bytes; + int zywrle_level; + + if (vs->zrle.type == VNC_ENCODING_ZYWRLE) { + if (!vs->vd->lossy || vs->tight.quality < 0 || 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->clientds.pf.bytes_per_pixel) { + case 1: + zrle_encode_8ne(vs, x, y, w, h, zywrle_level); + break; + + case 2: + if (vs->clientds.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->clientds.pf.rmax << vs->clientds.pf.rshift) < (1 << 24) && + (vs->clientds.pf.gmax << vs->clientds.pf.gshift) < (1 << 24) && + (vs->clientds.pf.bmax << vs->clientds.pf.bshift) < (1 << 24)); + + fits_in_ms3bytes = (vs->clientds.pf.rshift > 7 && + vs->clientds.pf.gshift > 7 && + vs->clientds.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); +} |