pxcloud/spice
5
0
Fork 0
mirror of https://gitlab.uni-freiburg.de/opensourcevdi/spice synced 2025-12-26 14:41:25 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
78c1465ed3
spice/client/glz_decode_tmpl.c
Christophe Fergeau 78c1465ed3 add #include <config.h> to all source files 
When using config.h, it must be the very first include in all source
files since it contains #define that may change the compilation process
(eg libc structure layout changes when it's used to enable large file
support on 32 bit x86 archs). This commit adds it at the beginning
of all .c and .cpp files
2011-05-03 14:44:10 +02:00

339 lines
13 KiB
C
Raw Blame History

/*
Copyright (C) 2009 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
// External defines: PLT, RGBX/PLTXX/ALPHA, TO_RGB32.
// If PLT4/1 and TO_RGB32 are defined, we need CAST_PLT_DISTANCE (
// because then the number of pixels differ from the units used in the compression)
/*
For each output pixel type the following macros are defined:
OUT_PIXEL - the output pixel type
COPY_PIXEL(p, out) - assigns the pixel to the place pointed by out and
increases out. Used in RLE.
Need special handling because in alpha we copy only
the pad byte.
COPY_REF_PIXEL(ref, out) - copies the pixel pointed by ref to the pixel pointed by out.
Increases ref and out.
COPY_COMP_PIXEL(encoder, out) - copies pixel from the compressed buffer to the decompressed
buffer. Increases out.
*/
#if !defined(LZ_RGB_ALPHA)
#define COPY_PIXEL(p, out) (*(out++) = p)
#define COPY_REF_PIXEL(ref, out) (*(out++) = *(ref++))
#endif
// decompressing plt to plt
#ifdef LZ_PLT
#ifndef TO_RGB32
#define OUT_PIXEL one_byte_pixel_t
#define FNAME(name) glz_plt_##name
#define COPY_COMP_PIXEL(in, out) {(out)->a = *(in++); out++;}
#else // TO_RGB32
#define OUT_PIXEL rgb32_pixel_t
#define COPY_PLT_ENTRY(ent, out) {\
(out)->b = ent; (out)->g = (ent >> 8); (out)->r = (ent >> 16); (out)->pad = 0;}
#ifdef PLT8
#define FNAME(name) glz_plt8_to_rgb32_##name
#define COPY_COMP_PIXEL(in, out, palette) { \
uint32_t rgb = palette->ents[*(in++)]; \
COPY_PLT_ENTRY(rgb, out); \
out++; \
}
#elif defined(PLT4_BE)
#define FNAME(name) glz_plt4_be_to_rgb32_##name
#define COPY_COMP_PIXEL(in, out, palette){ \
uint8_t byte = *(in++); \
uint32_t rgb = palette->ents[((byte >> 4) & 0x0f) % (palette->num_ents)]; \
COPY_PLT_ENTRY(rgb, out); \
out++; \
rgb = palette->ents[(byte & 0x0f) % (palette->num_ents)]; \
COPY_PLT_ENTRY(rgb, out); \
out++; \
}
#define CAST_PLT_DISTANCE(dist) (dist*2)
#elif defined(PLT4_LE)
#define FNAME(name) glz_plt4_le_to_rgb32_##name
#define COPY_COMP_PIXEL(in, out, palette){ \
uint8_t byte = *(in++); \
uint32_t rgb = palette->ents[(byte & 0x0f) % (palette->num_ents)]; \
COPY_PLT_ENTRY(rgb, out); \
out++; \
rgb = palette->ents[((byte >> 4) & 0x0f) % (palette->num_ents)]; \
COPY_PLT_ENTRY(rgb, out); \
out++; \
}
#define CAST_PLT_DISTANCE(dist) (dist*2)
#elif defined(PLT1_BE) // TODO store palette entries for direct access
#define FNAME(name) glz_plt1_be_to_rgb32_##name
#define COPY_COMP_PIXEL(in, out, palette){ \
uint8_t byte = *(in++); \
int i; \
uint32_t fore = palette->ents[1]; \
uint32_t back = palette->ents[0]; \
for (i = 7; i >= 0; i--) \
{ \
if ((byte >> i) & 1) { \
COPY_PLT_ENTRY(fore, out); \
} else { \
COPY_PLT_ENTRY(back, out); \
} \
out++; \
} \
}
#define CAST_PLT_DISTANCE(dist) (dist*8)
#elif defined(PLT1_LE)
#define FNAME(name) glz_plt1_le_to_rgb32_##name
#define COPY_COMP_PIXEL(in, out, palette){ \
uint8_t byte = *(in++); \
int i; \
uint32_t fore = palette->ents[1]; \
uint32_t back = palette->ents[0]; \
for (i = 0; i < 8; i++) \
{ \
if ((byte >> i) & 1) { \
COPY_PLT_ENTRY(fore, out); \
} else { \
COPY_PLT_ENTRY(back, out); \
} \
out++; \
} \
}
#define CAST_PLT_DISTANCE(dist) (dist*8)
#endif // PLT Type
#endif // TO_RGB32
#endif
#ifdef LZ_RGB16
#ifndef TO_RGB32
#define OUT_PIXEL rgb16_pixel_t
#define FNAME(name) glz_rgb16_##name
#define COPY_COMP_PIXEL(in, out) {*out = (*(in++)) << 8; *out |= *(in++); out++;}
#else
#define OUT_PIXEL rgb32_pixel_t
#define FNAME(name) glz_rgb16_to_rgb32_##name
#define COPY_COMP_PIXEL(in, out) {out->r = *(in++); out->b= *(in++); \
out->g = (((out->r) << 6) | ((out->b) >> 2)) & ~0x07; \
out->g |= (out->g >> 5); \
out->r = ((out->r << 1) & ~0x07) | ((out->r >> 4) & 0x07) ; \
out->b = (out->b << 3) | ((out->b >> 2) & 0x07); \
out->pad = 0; \
out++; \
}
#endif
#endif
#ifdef LZ_RGB24
#define OUT_PIXEL rgb24_pixel_t
#define FNAME(name) glz_rgb24_##name
#define COPY_COMP_PIXEL(in, out) { \
out->b = *(in++); \
out->g = *(in++); \
out->r = *(in++); \
out++; \
}
#endif
#ifdef LZ_RGB32
#define OUT_PIXEL rgb32_pixel_t
#define FNAME(name) glz_rgb32_##name
#define COPY_COMP_PIXEL(in, out) { \
out->b = *(in++); \
out->g = *(in++); \
out->r = *(in++); \
out->pad = 0; \
out++; \
}
#endif
#ifdef LZ_RGB_ALPHA
#define OUT_PIXEL rgb32_pixel_t
#define FNAME(name) glz_rgb_alpha_##name
#define COPY_PIXEL(p, out) {out->pad = p.pad; out++;}
#define COPY_REF_PIXEL(ref, out) {out->pad = ref->pad; out++; ref++;}
#define COPY_COMP_PIXEL(in, out) {out->pad = *(in++); out++;}
#endif
// TODO: separate into routines that decode to dist,len. and to a routine that
// actually copies the data.
/* returns num of bytes read from in buf.
size should be in PIXEL */
static size_t FNAME(decode)(GlzDecoderWindow &window, uint8_t* in_buf,
uint8_t *out_buf, int size,
DecodedImageWinId image_win_id, SpicePalette *plt,
GlzDecoderDebug &debug_calls)
{
uint8_t *ip = in_buf;
OUT_PIXEL *out_pix_buf = (OUT_PIXEL *)out_buf;
OUT_PIXEL *op = out_pix_buf;
OUT_PIXEL *op_limit = out_pix_buf + size;
uint32_t ctrl = *(ip++);
int loop = true;
do {
if (ctrl >= MAX_COPY) { // reference (dictionary/RLE)
OUT_PIXEL *ref = op;
uint32_t len = ctrl >> 5;
uint8_t pixel_flag = (ctrl >> 4) & 0x01;
uint32_t pixel_ofs = (ctrl & 0x0f);
uint8_t image_flag;
uint32_t image_dist;
/* retrieving the referenced images, the offset of the first pixel,
and the match length */
uint8_t code;
//len--; // TODO: why do we do this?
if (len == 7) { // match length is bigger than 7
do {
code = *(ip++);
len += code;
} while (code == 255); // remaining of len
}
code = *(ip++);
pixel_ofs += (code << 4);
code = *(ip++);
image_flag = (code >> 6) & 0x03;
if (!pixel_flag) { // short pixel offset
image_dist = code & 0x3f;
for (int i = 0; i < image_flag; i++) {
code = *(ip++);
image_dist += (code << (6 + (8 * i)));
}
} else {
pixel_flag = (code >> 5) & 0x01;
pixel_ofs += (code & 0x1f) << 12;
image_dist = 0;
for (int i = 0; i < image_flag; i++) {
code = *(ip++);
image_dist += (code << 8 * i);
}
if (pixel_flag) { // very long pixel offset
code = *(ip++);
pixel_ofs += code << 17;
}
}
#if defined(LZ_PLT) || defined(LZ_RGB_ALPHA)
len += 2; // length is biased by 2 (fixing bias)
#elif defined(LZ_RGB16)
len += 1; // length is biased by 1 (fixing bias)
#endif
if (!image_dist) {
pixel_ofs += 1; // offset is biased by 1 (fixing bias)
}
#if defined(TO_RGB32)
#if defined(PLT4_BE) || defined(PLT4_LE) || defined(PLT1_BE) || defined(PLT1_LE)
pixel_ofs = CAST_PLT_DISTANCE(pixel_ofs);
len = CAST_PLT_DISTANCE(len);
#endif
#endif
if (!image_dist) { // reference is inside the same image
ref -= pixel_ofs;
GLZ_ASSERT(debug_calls, ref + len <= op_limit);
GLZ_ASSERT(debug_calls, ref >= out_pix_buf);
} else {
ref = (OUT_PIXEL *)window.get_ref_pixel(image_win_id, image_dist,
pixel_ofs);
}
GLZ_ASSERT(debug_calls, op + len <= op_limit);
/* copying the match*/
if (ref == (op - 1)) { // run (this will never be called in PLT4/1_TO_RGB because the
// number of pixel copied is larger then one...
/* optimize copy for a run */
OUT_PIXEL b = *ref;
for (; len; --len) {
COPY_PIXEL(b, op);
GLZ_ASSERT(debug_calls, op <= op_limit);
}
} else {
for (; len; --len) {
COPY_REF_PIXEL(ref, op);
GLZ_ASSERT(debug_calls, op <= op_limit);
}
}
} else { // copy
ctrl++; // copy count is biased by 1
#if defined(TO_RGB32) && (defined(PLT4_BE) || defined(PLT4_LE) || defined(PLT1_BE) || \
defined(PLT1_LE))
GLZ_ASSERT(debug_calls, op + CAST_PLT_DISTANCE(ctrl) <= op_limit);
#else
GLZ_ASSERT(debug_calls, op + ctrl <= op_limit);
#endif
#if defined(TO_RGB32) && defined(LZ_PLT)
GLZ_ASSERT(debug_calls, plt);
COPY_COMP_PIXEL(ip, op, plt);
#else
COPY_COMP_PIXEL(ip, op);
#endif
GLZ_ASSERT(debug_calls, op <= op_limit);
for (--ctrl; ctrl; ctrl--) {
#if defined(TO_RGB32) && defined(LZ_PLT)
GLZ_ASSERT(debug_calls, plt);
COPY_COMP_PIXEL(ip, op, plt);
#else
COPY_COMP_PIXEL(ip, op);
#endif
GLZ_ASSERT(debug_calls, op <= op_limit);
}
} // END REF/COPY
if (LZ_EXPECT_CONDITIONAL(op < op_limit)) {
ctrl = *(ip++);
} else {
loop = false;
}
} while (LZ_EXPECT_CONDITIONAL(loop));
return (ip - in_buf);
}
#undef LZ_PLT
#undef PLT8
#undef PLT4_BE
#undef PLT4_LE
#undef PLT1_BE
#undef PLT1_LE
#undef LZ_RGB16
#undef LZ_RGB24
#undef LZ_RGB32
#undef LZ_RGB_ALPHA
#undef TO_RGB32
#undef OUT_PIXEL
#undef FNAME
#undef COPY_PIXEL
#undef COPY_REF_PIXEL
#undef COPY_COMP_PIXEL
#undef COPY_PLT_ENTRY
#undef CAST_PLT_DISTANCE
Reference in New Issue View Git Blame Copy Permalink