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BPTSRL2.h
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BPTSRL2.h
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// ----------------------------------------------------------------------------
/*
The MIT License (MIT)
Copyright (c) 2000- Brad P. Taylor
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.
*/
// ----------------------------------------------------------------------------
#if !defined(AFX_BPTSRL2_H__CCC1EB59_863C_4490_84CA_C1F171D48D87__INCLUDED_)
#define AFX_BPTSRL2_H__CCC1EB59_863C_4490_84CA_C1F171D48D87__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// ----------------------------------------------------------------------------
// can be based on CObject for debug memory leak tracking
// ----------------------------------------------------------------------------
#include <vector>
#include <utility>
#include "BPTBlitter.h"
// ----------------------------------------------------------------------------
namespace BPT {
/*
*
* THIS CODE IS CURRENTLY BROKEN -
* 1) the HandleValueSeekLogic doesn't work as a single pass this needs 2 passes
* 2) the starting position isn't currently accounted for it needs to be captured at the start of a line.
THOUGHTS ON SRL2 - the skip can also indicate a stream rewind/fast-forward
(this would probably be effective like a sliding dictionary like compression)
Starts getting into T14 teritory where it might be effective since alpha comes
into play - of course alpha is a special case in T14 but new states could be
added to allow for the same concept as SRL2 - making a further command stream
specializations like alpha in this probably would be trivial as well.
THINK about this like a little CPU??? with write and move pointer instructions
this probably should be it's own framework ? might have already have another
one from the GBA source code.
*/
struct SRL2BaseObject : public CObject {};
// ========================================================================
//
// SRL2 control BYTE format
//
// xxxxxxx1 == SKIP_PREFIX code of (xxxxxxx sub code defined below)
//
// (SUBCODE.SRL2) xxxxxx11 == DST SKIP skip for values table skip code of (xxxxxx + 1)
// (SUBCODE.SRL2) xxxxxx01 == VALUE STREAM SHORT SEEK for values table skip code of (xxxxxx - 32) // [-32 to 31]?
// (SUBCODE.SRL2) 00000001 == VALUE STREAM LONG SEEK - next 2 command bytes are an offset (~ +/- 1<<15)
//
// xxxxxx10 == run of (xxxxxx + 1) of the next value in the value stream
// xxxxxx00 == literal run (xxxxxx + 1) of next n values from the stream
//
// The stream format varies depending on type that was compressed.
//
// ========================================================================
// ========================================================================
// Compress data into code & value streams
// ========================================================================
//
// TSRL2Compressor
//
template< class T >
class TSRL2Compressor : public SRL2BaseObject {
public:
typedef T VALUE_TYPE;
typedef unsigned char CODE_ENTRY;
typedef std::vector<VALUE_TYPE> VALUE_COLLECTION;
typedef std::vector<CODE_ENTRY> CODE_COLLECTION;
typedef std::pair< CODE_COLLECTION, VALUE_COLLECTION* > INFO;
enum : unsigned {
SKIP_PREFIX_FLAG = 0x01
, SKIP_DEST_FLAG = 0x02
, RUN_FLAG = 0x02
};
enum : unsigned {
MAX_SKIP_LENGTH = 63 // needs validation should it be 63 for safety?
, MAX_RUN_LENGTH = 64
, MAX_LITERAL_LENGTH = 64
};
protected:
enum RUNTYPE : unsigned {
SKIP_DEST,
STREAM_SEEK,
RUN,
LITERAL
};
void HandleValueSeekLogic(INFO& info, CODE_COLLECTION& out, const int length )
{
#if 1
return /* NOP */;
#else
//if (2 > length) return /* NOP */;
auto it = info.second->begin();
auto end = info.second->end();
auto latest = it + info.second->size() - length;
// TODO search for the sequence [latest end) in inside [it latest)
auto found = std::search(it, latest, latest, end);
if (latest != found)
{
auto offset = (found - latest);
//TRACE("found sequence of length %d at offset %d\n", length, offset);
if ((MAX_SKIP_LENGTH/2) > abs(offset))
{
out.push_back(((offset+ (MAX_SKIP_LENGTH / 2)) << 2) | (SKIP_PREFIX_FLAG));
}
else
{
offset += 1<<15; // move up to (-32k to 32k) to [0 to 64k)
out.push_back(SKIP_PREFIX_FLAG); // signal long seek
out.push_back((offset >> 8) & 0xff);
out.push_back((offset) & 0xff);
}
}
#endif
}
void EmitCode(INFO& info, CODE_COLLECTION& out, RUNTYPE type, const int length) {
// ??? TODO verify the -1 the 63 limits above make me think we might be limiting run lengths by 1 (....)
if (SKIP_DEST == type) {
out.push_back(((length - 1) << 2) | (SKIP_PREFIX_FLAG | SKIP_DEST_FLAG));
}
else if (RUN == type) {
out.push_back(((length - 1) << 2) | RUN_FLAG);
}
else { // Literal
HandleValueSeekLogic(info, out, length);
out.push_back(((length - 1) << 2));
}
}
public:
template< class InIt, class Pred >
bool operator()(INFO& info, InIt first, InIt last, Pred shouldStore) {
// Figure out what type of code to start with skip or literal
// ----------------------------------------------------------------
RUNTYPE type;
InIt it = first;
T value = *it++;
int count = 1;
bool bStore = shouldStore(value);
if (bStore) {
type = LITERAL;
info.second->push_back(value);
}
else {
type = SKIP_DEST;
}
// Run through the remaining values collecting runs
// ----------------------------------------------------------------
while (it != last) {
bool bLastStore = bStore;
T lastValue = value;
value = *it++;
bStore = shouldStore(value);
if ((value == lastValue) && (bLastStore == bStore)) {
if ((LITERAL == type) && (1 != count)) {
EmitCode(info, info.first, type, count - 1);
count = 1;
}
++count;
if (bStore) {
if (count > MAX_RUN_LENGTH) {
EmitCode(info, info.first, RUN, MAX_RUN_LENGTH);
info.second->push_back(value);
type = LITERAL;
count = 1;
}
else {
type = RUN;
}
}
else {
if (count > MAX_SKIP_LENGTH) {
EmitCode(info, info.first, SKIP_DEST, MAX_SKIP_LENGTH);
count = 1;
}
}
}
else {
if ((LITERAL == type) && bStore) {
info.second->push_back(value);
++count;
if (count > MAX_LITERAL_LENGTH) {
EmitCode(info, info.first, LITERAL, MAX_LITERAL_LENGTH);
count = 1;
}
}
else {
// Add the last 'code' to the codes collection
EmitCode(info, info.first, type, count);
// now determine what type of code to start
count = 1;
if (bStore) {
info.second->push_back(value);
type = LITERAL;
}
else {
type = SKIP_DEST;
}
}
}
}
// Dump the last code to the code collection
EmitCode(info, info.first, type, count);
return true;
}
}; // class TSRL2Compressor
// ========================================================================
// Decode
// ========================================================================
//
// TDecodeSRL2<>
//
template< class SRL2 >
class TDecodeSRL2 : public SRL2BaseObject {
protected:
public:
TDecodeSRL2() { /* Empty */ }
// --------------------------------------------------------------------
template<typename W> int ReadLargerSeekValue(W& codes)
{
return ((*codes++ << 8) | (*codes++)) - (1<<15); // stupid magic values... abstract out
}
template<
class DST_IT,
class CODE_IT,
class VALUE_IT,
class TOP
>
__forceinline void operator()(
DST_IT dstIT, CODE_IT codes, VALUE_IT values,
int skipCount, int writeCount, TOP top) {
// Handle any skipping
// ----------------------------------------------------------------
int runCount = 0;
int code = 0;
while (0 < skipCount) {
int sCode = static_cast<int>(*codes++);
if (sCode & SRL2::SKIP_PREFIX_FLAG) {
int subCode = code >> 2; // (sCode & SRL2::SKIP_DEST_FLAG);
if (SRL2::SKIP_DEST_FLAG & sCode)
{
runCount = subCode + 1;
skipCount -= runCount;
if (0 > skipCount) {
writeCount += skipCount;
dstIT -= skipCount;
break;
}
}
else if (0 != subCode)
{
int seek = subCode - (SRL2::MAX_SKIP_LENGTH / 2); // should have another helper function for abstacting away the bias
values += seek;
}
else /* zero flag on a good compiler */
{
int seek = ReadLargerSeekValue(codes);
values += seek;
}
}
else if (sCode & SRL2::RUN_FLAG) {
runCount = (sCode >> 2) + 1;
skipCount -= runCount;
if (0 > skipCount) {
runCount = -skipCount;
goto HANDLE_RUN;
}
++values;
}
else {
runCount = (sCode >> 2) + 1;
values += runCount;
skipCount -= runCount;
if (0 > skipCount) {
values += skipCount;
runCount = -skipCount;
goto HANDLE_LITERAL;
}
}
}
// Finally get down
// ----------------------------------------------------------------
while (0 < writeCount) {
code = static_cast<int>(*codes++);
if (code & SRL2::SKIP_PREFIX_FLAG)
{
int subCode = code >> 2; // (code & SRL2::SKIP_DEST_FLAG);
if (SRL2::SKIP_DEST_FLAG & code)
{
runCount = subCode + 1;
writeCount -= runCount;
dstIT += runCount;
}
else if (0 != subCode)
{
int seek = subCode - (SRL2::MAX_SKIP_LENGTH / 2); // should have another helper function for abstacting away the bias
values += seek;
}
else /* zero flag on a good compiler */
{
int seek = ReadLargerSeekValue(codes);
values += seek;
}
}
else if (code & SRL2::RUN_FLAG) {
runCount = (code >> 2) + 1;
HANDLE_RUN:
typename SRL2::VALUE_TYPE value = *values++;
writeCount -= runCount;
if (0 > writeCount) {
runCount += writeCount;
}
top.OutputMajor(dstIT, dstIT + runCount, value);
dstIT += runCount;
}
else {
runCount = (code >> 2) + 1;
HANDLE_LITERAL:
writeCount -= runCount;
if (0 > writeCount) {
runCount += writeCount;
}
top.InputMajor(values, values + runCount, dstIT);
values += runCount;
dstIT += runCount;
}
}
}
// --------------------------------------------------------------------
template<
class CODE_IT,
class VALUE_IT
>
__forceinline bool HitTest(
CODE_IT codes, VALUE_IT values, int skipCount,
typename SRL2::VALUE_TYPE* pOptionalOutValue = 0) {
// Handle any 'skipping' to get to the correct value
// ----------------------------------------------------------------
while (0 < skipCount) {
int sCode = static_cast<int>(*codes++);
if (sCode & SRL2::SKIP_PREFIX_FLAG) {
int subCode = sCode >> 2; // (sCode & SRL2::SKIP_DEST_FLAG);
if (SRL2::SKIP_DEST_FLAG & sCode)
{
runCount = subCode + 1;
skipCount -= runCount;
if (0 > skipCount) {
return false;
}
}
else if (0 != subCode)
{
int seek = subCode - (MAX_SKIP_LENGTH / 2);
values += seek;
}
else /* zero flag on a good compiler */
{
int seek = ReadLargerSeekValue(codes);
values += seek;
}
}
else if (sCode & SRL2::RUN_FLAG) {
int runCount = (sCode >> 2) + 1;
skipCount -= runCount;
if (0 > skipCount) {
goto HANDLE_RUN;
}
++values;
}
else {
int runCount = (sCode >> 2) + 1;
values += runCount;
skipCount -= runCount;
if (0 > skipCount) {
values += skipCount;
goto HANDLE_LITERAL;
}
}
}
// ----------------------------------------------------------------
int code = static_cast<int>(*codes++);
if (SRL2::SKIP_PREFIX_FLAG & code) {
if ( SRL2::SKIP_DEST_FLAG & code ) return false;
int subCode = code >> 2;
if (0 != subCode)
{
int seek = subCode - (MAX_SKIP_LENGTH / 2);
values += seek;
}
else /* zero flag on a good compiler */
{
int seek = ReadLargerSeekValue(codes);
values += seek;
}
}
HANDLE_RUN:
HANDLE_LITERAL:
if (pOptionalOutValue) {
*pOptionalOutValue = *values;
}
return true;
}
}; // class TDecodeSRL2
// ========================================================================
// ========================================================================
template< class SRL2 >
class TSRL2CompressedImage : public SRL2BaseObject {
public: // Traits
typedef typename SRL2::VALUE_TYPE storage_type;
typedef SRL2 SRL2_type;
typedef TSRL2CompressedImage<SRL2> this_type;
protected: // Data
typename SRL2_type::VALUE_COLLECTION m_SharedValuesCollection;
typename SRL2_type::INFO* m_CompressedInfo;
SIZE m_Size;
SRL2_type m_Compressor;
TDecodeSRL2<SRL2> m_Decompressor;
size_t m_CompressedSizeEstimate;
public: // Interface
TSRL2CompressedImage() {
m_CompressedSizeEstimate = 0;
m_Size.cx = 0;
m_Size.cy = 0;
m_CompressedInfo = 0;
};
~TSRL2CompressedImage() {
Destroy();
}
// --------------------------------------------------------------------
RECT Rect() const {
return { 0, 0, m_Size.cx, m_Size.cy };
}
SIZE Size() const {
return m_Size;
}
size_t UncompressedSizeEstimate() const {
return m_Size.cx * m_Size.cy * sizeof(storage_type);
}
size_t CompressedSizeEstimate() const {
return m_CompressedSizeEstimate;
}
bool HasData() const {
return (0 != m_Size.cx) && (0 != m_Size.cy);
}
// --------------------------------------------------------------------
void Destroy() {
if (m_CompressedInfo) {
delete[] m_CompressedInfo;
m_CompressedInfo = 0;
}
m_Size.cx = 0;
m_Size.cy = 0;
m_CompressedSizeEstimate = 0;
m_SharedValuesCollection.clear();
}
// --------------------------------------------------------------------
template< class SURFACE, class PREDICATE >
bool Create(SURFACE& srcSurface, PREDICATE predicate, const RECT* pRect = 0) {
// Destroy any existing information
// ----------------------------------------------------------------
Destroy();
// Determine/limit the size of the operation and reserve elements
// ----------------------------------------------------------------
RECT surfaceRect = srcSurface.Rect();
if (pRect) {
if (!IntersectRect(&surfaceRect, &surfaceRect, pRect)) {
return false;
}
}
int cx = surfaceRect.right - surfaceRect.left;
int cy = surfaceRect.bottom - surfaceRect.top;
m_CompressedInfo = new typename SRL2_type::INFO[cy];
if (!m_CompressedInfo) {
return false;
}
// For each of the lines in the surface call the compressor
// ----------------------------------------------------------------
int codesCount = 0;
int valuesCount = 0;
for (int y = 0; y < cy; y++) {
m_CompressedInfo[y].second = &m_SharedValuesCollection;
typename SURFACE::pixel_iterator it = srcSurface.Iterator(
surfaceRect.left, y + surfaceRect.top
);
if (!m_Compressor(m_CompressedInfo[y], it, it + cx, predicate)) {
Destroy();
return false;
}
codesCount += m_CompressedInfo[y].first.size();
//valuesCount += m_CompressedInfo[y].second.size();
}
valuesCount = m_SharedValuesCollection.size();
m_CompressedSizeEstimate =
(sizeof(typename SRL2_type::INFO) * cy) +
(codesCount * sizeof(typename SRL2_type::CODE_ENTRY)) +
(valuesCount * sizeof(typename SRL2_type::VALUE_TYPE));
m_Size.cx = cx;
m_Size.cy = cy;
return true;
}
// --------------------------------------------------------------------
//
// BlitCore
//
// -- This can accept other forms of the decompressor!
//
template< class DST_SURFACE, class TOP, class DECOMPRESSOR >
void __forceinline BlitCore(
DECOMPRESSOR& decompressor,
DST_SURFACE& dstSurface
, const int x
, const int y
, TOP op = TOP()
, const BLITFX* blitFX = 0
, const RECT* optionalDstClipRect = 0
, const RECT* optionalSrcSubRect = 0
) {
// Check for an empty bitmap.
// ----------------------------------------------------------------
if ((0 == m_Size.cx) || (0 == m_Size.cy)) {
return /* NOP */;
}
// Clip the optional clipping rect to the dest bitmap limits
// ----------------------------------------------------------------
RECT dstLimitsRect = dstSurface.Rect();
RECT clippedDstRect;
if (optionalDstClipRect) {
if (!IntersectRect(&clippedDstRect, &dstLimitsRect, optionalDstClipRect)) {
return /* NOP */;
}
}
else {
clippedDstRect = dstLimitsRect;
}
// Get the source operation size
// ----------------------------------------------------------------
RECT srcLimitsRect = { 0, 0, m_Size.cx, m_Size.cy };
RECT clippedSrcRect;
if (optionalSrcSubRect) {
if (!IntersectRect(&clippedSrcRect, &srcLimitsRect, optionalSrcSubRect)) {
return /* NOP */;
}
}
else {
clippedSrcRect = srcLimitsRect;
}
// Perform a simple clipping operation to detect NOP
// ----------------------------------------------------------------
SIZE clippedSrcRectSize = SizeOfRect(&clippedSrcRect);
RECT dstOperation = {
x, y, x + clippedSrcRectSize.cx, y + clippedSrcRectSize.cy
};
RECT clippedRect;
if (!IntersectRect(&clippedRect, &clippedDstRect, &dstOperation)) {
return /* NOP */;
}
// Setup the general loop variables
// ----------------------------------------------------------------
int cx = clippedRect.right - clippedRect.left;
int cy = clippedRect.bottom - clippedRect.top;
int sx = ((clippedRect.left - x) + clippedSrcRect.left);
int sy = ((clippedRect.top - y) + clippedSrcRect.top);
// Check for flipping and adjust the dest position and step amount.
// ----------------------------------------------------------------
int dx, dy, ddx, ddy;
if (blitFX) {
if (BLITFX::HFLIP & blitFX->dwFlags) {
sx = (clippedSrcRect.right - (sx + cx));
dx = (clippedRect.right - 1);
ddx = -1;
}
else {
dx = clippedRect.left;
ddx = 1;
}
if (BLITFX::VFLIP & blitFX->dwFlags) {
sy = (clippedSrcRect.bottom - (sy + cy));
dy = (clippedRect.bottom - 1);
ddy = -1;
}
else {
dy = clippedRect.top;
ddy = 1;
}
}
else {
dx = clippedRect.left;
ddx = 1;
dy = clippedRect.top;
ddy = 1;
}
// Process the non clipped spans
// ----------------------------------------------------------------
if (1 == ddx) {
for (int ly = 0; ly < cy; ly++) {
typename DST_SURFACE::pixel_iterator dstIT = dstSurface.Iterator(dx, dy);
// call the decompressor
typename SRL2_type::INFO* pInfo = &m_CompressedInfo[sy];
decompressor(
dstIT,
pInfo->first.begin(), pInfo->second->begin(),
sx, cx, op
);
// advance the locations
dy += ddy;
++sy;
}
}
else {
for (int ly = 0; ly < cy; ly++) {
typename DST_SURFACE::reverse_iterator dstIT = dstSurface.rIterator(dx, dy);
// call the decompressor