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/*
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
#include <glib.h>
#include <pthread.h>
#include <stdio.h>
#include "glz-encoder.h"
#include "glz-encoder-priv.h"
/* Holds a specific data for one encoder, and data that is relevant for the current image encoded */
typedef struct Encoder {
GlzEncoderUsrContext *usr;
uint8_t id;
SharedDictionary *dict;
struct {
LzImageType type;
uint32_t id;
uint32_t first_win_seg;
} cur_image;
struct {
uint8_t *start;
uint8_t *now;
uint8_t *end;
size_t bytes_count;
uint8_t *last_copy; // pointer to the last byte in which copy count was written
} io;
} Encoder;
/**************************************************************************
* Handling writing the encoded image to the output buffer
***************************************************************************/
static inline int more_io_bytes(Encoder *encoder)
{
uint8_t *io_ptr;
int num_io_bytes = encoder->usr->more_space(encoder->usr, &io_ptr);
encoder->io.bytes_count += num_io_bytes;
encoder->io.now = io_ptr;
encoder->io.end = encoder->io.now + num_io_bytes;
return num_io_bytes;
}
static inline void encode(Encoder *encoder, uint8_t byte)
{
if (encoder->io.now == encoder->io.end) {
if (more_io_bytes(encoder) <= 0) {
encoder->usr->error(encoder->usr, "%s: no more bytes\n", __FUNCTION__);
}
GLZ_ASSERT(encoder->usr, encoder->io.now);
}
GLZ_ASSERT(encoder->usr, encoder->io.now < encoder->io.end);
*(encoder->io.now++) = byte;
}
static inline void encode_32(Encoder *encoder, unsigned int word)
{
encode(encoder, (uint8_t)(word >> 24));
encode(encoder, (uint8_t)(word >> 16) & 0x0000ff);
encode(encoder, (uint8_t)(word >> 8) & 0x0000ff);
encode(encoder, (uint8_t)(word & 0x0000ff));
}
static inline void encode_64(Encoder *encoder, uint64_t word)
{
encode_32(encoder, (uint32_t)(word >> 32));
encode_32(encoder, (uint32_t)(word & 0xffffff));
}
static inline void encode_copy_count(Encoder *encoder, uint8_t copy_count)
{
encode(encoder, copy_count);
encoder->io.last_copy = encoder->io.now - 1; // io_now cannot be the first byte of the buffer
}
static inline void update_copy_count(Encoder *encoder, uint8_t copy_count)
{
GLZ_ASSERT(encoder->usr, encoder->io.last_copy);
*(encoder->io.last_copy) = copy_count;
}
// decrease the io ptr by 1
static inline void compress_output_prev(Encoder *encoder)
{
// io_now cannot be the first byte of the buffer
encoder->io.now--;
// the function should be called only when copy count is written unnecessarily by glz_compress
GLZ_ASSERT(encoder->usr, encoder->io.now == encoder->io.last_copy)
}
static bool encoder_reset(Encoder *encoder, uint8_t *io_ptr, uint8_t *io_ptr_end)
{
GLZ_ASSERT(encoder->usr, io_ptr <= io_ptr_end);
encoder->io.bytes_count = io_ptr_end - io_ptr;
encoder->io.start = io_ptr;
encoder->io.now = io_ptr;
encoder->io.end = io_ptr_end;
encoder->io.last_copy = NULL;
return TRUE;
}
/**********************************************************
* Encoding
***********************************************************/
GlzEncoderContext *glz_encoder_create(uint8_t id, GlzEncDictContext *dictionary,
GlzEncoderUsrContext *usr)
{
Encoder *encoder;
if (!usr || !usr->error || !usr->warn || !usr->info || !usr->malloc ||
!usr->free || !usr->more_space) {
return NULL;
}
if (!(encoder = (Encoder *)usr->malloc(usr, sizeof(Encoder)))) {
return NULL;
}
encoder->id = id;
encoder->usr = usr;
encoder->dict = (SharedDictionary *)dictionary;
return (GlzEncoderContext *)encoder;
}
void glz_encoder_destroy(GlzEncoderContext *opaque_encoder)
{
Encoder *encoder = (Encoder *)opaque_encoder;
if (!opaque_encoder) {
return;
}
encoder->usr->free(encoder->usr, encoder);
}
/*
* Give hints to the compiler for branch prediction optimization.
*/
#if defined(__GNUC__) && (__GNUC__ > 2)
#define LZ_EXPECT_CONDITIONAL(c) (__builtin_expect((c), 1))
#define LZ_UNEXPECT_CONDITIONAL(c) (__builtin_expect((c), 0))
#else
#define LZ_EXPECT_CONDITIONAL(c) (c)
#define LZ_UNEXPECT_CONDITIONAL(c) (c)
#endif
typedef uint8_t BYTE;
typedef struct __attribute__ ((__packed__)) one_byte_pixel_t {
BYTE a;
} one_byte_pixel_t;
typedef struct __attribute__ ((__packed__)) rgb32_pixel_t {
BYTE b;
BYTE g;
BYTE r;
BYTE pad;
} rgb32_pixel_t;
typedef struct __attribute__ ((__packed__)) rgb24_pixel_t {
BYTE b;
BYTE g;
BYTE r;
} rgb24_pixel_t;
typedef uint16_t rgb16_pixel_t;
#define BOUND_OFFSET 2
#define LIMIT_OFFSET 6
#define MIN_FILE_SIZE 4
#define MAX_PIXEL_SHORT_DISTANCE 4096 // (1 << 12)
#define MAX_PIXEL_MEDIUM_DISTANCE 131072 // (1 << 17) 2 ^ (12 + 5)
#define MAX_PIXEL_LONG_DISTANCE 33554432 // (1 << 25) 2 ^ (12 + 5 + 8)
#define MAX_IMAGE_DIST 16777215 // (1 << 24 - 1)
//#define DEBUG_ENCODE
#define GLZ_ENCODE_SIZE
#include "glz-encode-match.tmpl.c"
#define GLZ_ENCODE_MATCH
#include "glz-encode-match.tmpl.c"
#define LZ_PLT
#include "glz-encode.tmpl.c"
#define LZ_RGB16
#include "glz-encode.tmpl.c"
#define LZ_RGB24
#include "glz-encode.tmpl.c"
#define LZ_RGB32
#include "glz-encode.tmpl.c"
#define LZ_RGB_ALPHA
#include "glz-encode.tmpl.c"
int glz_encode(GlzEncoderContext *opaque_encoder,
LzImageType type, int width, int height, int top_down,
uint8_t *lines, unsigned int num_lines, int stride,
uint8_t *io_ptr, unsigned int num_io_bytes,
GlzUsrImageContext *usr_context, GlzEncDictImageContext **o_enc_dict_context)
{
Encoder *encoder = (Encoder *)opaque_encoder;
WindowImage *dict_image;
uint8_t *io_ptr_end = io_ptr + num_io_bytes;
uint32_t win_head_image_dist;
if (IS_IMAGE_TYPE_PLT[type]) {
if (stride > (width / PLT_PIXELS_PER_BYTE[type])) {
if (((width % PLT_PIXELS_PER_BYTE[type]) == 0) || (
(stride - (width / PLT_PIXELS_PER_BYTE[type])) > 1)) {
encoder->usr->error(encoder->usr, "stride overflows (plt)\n");
}
}
} else {
if (stride != width * RGB_BYTES_PER_PIXEL[type]) {
encoder->usr->error(encoder->usr, "stride != width*bytes_per_pixel (rgb)\n");
}
}
// assign the output buffer
if (!encoder_reset(encoder, io_ptr, io_ptr_end)) {
encoder->usr->error(encoder->usr, "lz encoder io reset failed\n");
}
// first read the list of the image segments into the dictionary window
dict_image = glz_dictionary_pre_encode(encoder->id, encoder->usr,
encoder->dict, type, width, height, stride,
lines, num_lines, usr_context, &win_head_image_dist);
*o_enc_dict_context = (GlzEncDictImageContext *)dict_image;
encoder->cur_image.type = type;
encoder->cur_image.id = dict_image->id;
encoder->cur_image.first_win_seg = dict_image->first_seg;
encode_32(encoder, GUINT32_TO_LE(LZ_MAGIC));
encode_32(encoder, LZ_VERSION);
if (top_down) {
encode(encoder, (type & LZ_IMAGE_TYPE_MASK) | (1 << LZ_IMAGE_TYPE_LOG));
} else {
encode(encoder, (type & LZ_IMAGE_TYPE_MASK));
}
encode_32(encoder, width);
encode_32(encoder, height);
encode_32(encoder, stride);
encode_64(encoder, dict_image->id);
encode_32(encoder, win_head_image_dist);
switch (encoder->cur_image.type) {
case LZ_IMAGE_TYPE_PLT1_BE:
case LZ_IMAGE_TYPE_PLT1_LE:
case LZ_IMAGE_TYPE_PLT4_BE:
case LZ_IMAGE_TYPE_PLT4_LE:
case LZ_IMAGE_TYPE_PLT8:
glz_plt_compress(encoder);
break;
case LZ_IMAGE_TYPE_RGB16:
glz_rgb16_compress(encoder);
break;
case LZ_IMAGE_TYPE_RGB24:
glz_rgb24_compress(encoder);
break;
case LZ_IMAGE_TYPE_RGB32:
glz_rgb32_compress(encoder);
break;
case LZ_IMAGE_TYPE_RGBA:
glz_rgb32_compress(encoder);
glz_rgb_alpha_compress(encoder);
break;
case LZ_IMAGE_TYPE_INVALID:
default:
encoder->usr->error(encoder->usr, "bad image type\n");
}
glz_dictionary_post_encode(encoder->id, encoder->usr, encoder->dict);
// move all the used segments to the free ones
encoder->io.bytes_count -= (encoder->io.end - encoder->io.now);
return encoder->io.bytes_count;
}
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