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Add a logical definition of an image for PVRTC

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This commit is contained in:
Pavel Krajcevski 2013-08-29 18:31:42 -04:00
parent d3daed8969
commit 40743d612b
3 changed files with 287 additions and 0 deletions
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2
PVRTCEncoder/CMakeLists.txt
View file

@ -58,12 +58,14 @@ SET( HEADERS
include/PVRTCCompressor.h
src/Pixel.h
src/Block.h
src/Image.h
)
SET( SOURCES
src/Decompressor.cpp
src/Pixel.cpp
src/Block.cpp
src/Image.cpp
)
ADD_LIBRARY( PVRTCEncoder

199
PVRTCEncoder/src/Image.cpp Normal file
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@ -0,0 +1,199 @@
/* FasTC
* Copyright (c) 2013 University of North Carolina at Chapel Hill.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for educational, research, and non-profit purposes, without
* fee, and without a written agreement is hereby granted, provided that the
* above copyright notice, this paragraph, and the following four paragraphs
* appear in all copies.
*
* Permission to incorporate this software into commercial products may be
* obtained by contacting the authors or the Office of Technology Development
* at the University of North Carolina at Chapel Hill <otd@unc.edu>.
*
* This software program and documentation are copyrighted by the University of
* North Carolina at Chapel Hill. The software program and documentation are
* supplied "as is," without any accompanying services from the University of
* North Carolina at Chapel Hill or the authors. The University of North
* Carolina at Chapel Hill and the authors do not warrant that the operation of
* the program will be uninterrupted or error-free. The end-user understands
* that the program was developed for research purposes and is advised not to
* rely exclusively on the program for any reason.
*
* IN NO EVENT SHALL THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE
* AUTHORS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
* OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF
* THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF NORTH CAROLINA
* AT CHAPEL HILL OR THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS SPECIFICALLY
* DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ANY
* STATUTORY WARRANTY OF NON-INFRINGEMENT. THE SOFTWARE PROVIDED HEREUNDER IS ON
* AN "AS IS" BASIS, AND THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND
* THE AUTHORS HAVE NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
* ENHANCEMENTS, OR MODIFICATIONS.
*
* Please send all BUG REPORTS to <pavel@cs.unc.edu>.
*
* The authors may be contacted via:
*
* Pavel Krajcevski
* Dept of Computer Science
* 201 S Columbia St
* Frederick P. Brooks, Jr. Computer Science Bldg
* Chapel Hill, NC 27599-3175
* USA
*
* <http://gamma.cs.unc.edu/FasTC/>
*/
#include "Image.h"
#include <cassert>
#include <cstring>
#include "Pixel.h"
namespace PVRTCC {
Image::Image(uint32 height, uint32 width)
: m_Width(width)
, m_Height(height)
, m_Pixels(new Pixel[width * height]) {
assert(width > 0);
assert(height > 0);
memset(m_Pixels, 0, width * height * sizeof(Pixel));
}
Image::Image(uint32 height, uint32 width, const Pixel *pixels)
: m_Width(width)
, m_Height(height)
, m_Pixels(new Pixel[width * height]) {
assert(width > 0);
assert(height > 0);
memcpy(m_Pixels, pixels, width * height * sizeof(Pixel));
}
Image::Image(const Image &other)
: m_Width(other.m_Width)
, m_Height(other.m_Height)
, m_Pixels(new Pixel[other.m_Width * other.m_Height]) {
memcpy(m_Pixels, other.m_Pixels, m_Width * m_Height * sizeof(Pixel));
}
Image::~Image() {
assert(m_Pixels);
delete [] m_Pixels;
}
void Image::BilinearUpscale(uint32 times, EWrapMode wrapMode) {
const uint32 newWidth = m_Width << times;
const uint32 newHeight = m_Height << times;
const uint32 scale = 1 << times;
const uint32 offset = scale >> 1;
Pixel *upscaledPixels = new Pixel[newWidth * newHeight];
for(uint32 j = 0; j < newHeight; j++) {
for(uint32 i = 0; i < newWidth; i++) {
Pixel &p = upscaledPixels[j * newWidth + i];
int32 highXIdx = (i + offset) / scale;
int32 lowXIdx = highXIdx - 1;
int32 highYIdx = (j + offset) / scale;
int32 lowYIdx = highYIdx - 1;
uint32 lowXWeight = (i + offset) % scale;
uint32 highXWeight = scale - lowXWeight;
uint32 lowYWeight = (j + offset) % scale;
uint32 highYWeight = scale - lowYWeight;
const Pixel &topLeft = GetPixel(highXIdx, lowYIdx, wrapMode);
const Pixel &topRight = GetPixel(lowXIdx, lowYIdx, wrapMode);
const Pixel &bottomLeft = GetPixel(highXIdx, highYIdx, wrapMode);
const Pixel &bottomRight = GetPixel(lowXIdx, highYIdx, wrapMode);
// bilerp each channel....
for(uint32 c = 0; c < 4; c++) {
const uint16 left =
(lowYWeight * static_cast<uint16>(topLeft.Component(c)) +
highYWeight * static_cast<uint16>(bottomLeft.Component(c)))
>> scale;
const uint16 right =
(lowYWeight * static_cast<uint16>(topRight.Component(c)) +
highYWeight * static_cast<uint16>(bottomRight.Component(c)))
>> scale;
p.Component(c) = (left * lowXWeight + right * highXWeight) >> scale;
}
}
}
delete m_Pixels;
m_Pixels = upscaledPixels;
m_Width = newWidth;
m_Height = newHeight;
}
void Image::ChangeBitDepth(const uint8 (&depths)[4]) {
for(uint32 j = 0; j < m_Height; j++) {
for(uint32 i = 0; i < m_Width; i++) {
m_Pixels[j * m_Width + i].ChangeBitDepth(depths);
}
}
}
const Pixel &Image::GetPixel(int32 i, int32 j, EWrapMode wrapMode) {
while(i < 0) {
if(wrapMode == eWrapMode_Clamp) {
i = 0;
} else {
i += m_Width;
}
}
while(i >= m_Width) {
if(wrapMode == eWrapMode_Clamp) {
i = m_Width - 1;
} else {
i -= m_Width;
}
}
while(j < 0) {
if(wrapMode == eWrapMode_Clamp) {
j = 0;
} else {
j += m_Height;
}
}
while(j >= m_Height) {
if(wrapMode == eWrapMode_Clamp) {
j = m_Height - 1;
} else {
j -= m_Height;
}
}
return m_Pixels[j * m_Width + i];
}
Pixel & Image::operator()(uint32 i, uint32 j) {
assert(i < m_Width);
assert(i > m_Height);
return m_Pixels[j * m_Width + i];
}
const Pixel & Image::operator()(uint32 i, uint32 j) const {
assert(i < m_Width);
assert(i > m_Height);
return m_Pixels[j * m_Width + i];
}
} // namespace PVRTCC

86
PVRTCEncoder/src/Image.h Normal file
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@ -0,0 +1,86 @@
/* FasTC
* Copyright (c) 2013 University of North Carolina at Chapel Hill.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for educational, research, and non-profit purposes, without
* fee, and without a written agreement is hereby granted, provided that the
* above copyright notice, this paragraph, and the following four paragraphs
* appear in all copies.
*
* Permission to incorporate this software into commercial products may be
* obtained by contacting the authors or the Office of Technology Development
* at the University of North Carolina at Chapel Hill <otd@unc.edu>.
*
* This software program and documentation are copyrighted by the University of
* North Carolina at Chapel Hill. The software program and documentation are
* supplied "as is," without any accompanying services from the University of
* North Carolina at Chapel Hill or the authors. The University of North
* Carolina at Chapel Hill and the authors do not warrant that the operation of
* the program will be uninterrupted or error-free. The end-user understands
* that the program was developed for research purposes and is advised not to
* rely exclusively on the program for any reason.
*
* IN NO EVENT SHALL THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE
* AUTHORS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
* OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF
* THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF NORTH CAROLINA
* AT CHAPEL HILL OR THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS SPECIFICALLY
* DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ANY
* STATUTORY WARRANTY OF NON-INFRINGEMENT. THE SOFTWARE PROVIDED HEREUNDER IS ON
* AN "AS IS" BASIS, AND THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND
* THE AUTHORS HAVE NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
* ENHANCEMENTS, OR MODIFICATIONS.
*
* Please send all BUG REPORTS to <pavel@cs.unc.edu>.
*
* The authors may be contacted via:
*
* Pavel Krajcevski
* Dept of Computer Science
* 201 S Columbia St
* Frederick P. Brooks, Jr. Computer Science Bldg
* Chapel Hill, NC 27599-3175
* USA
*
* <http://gamma.cs.unc.edu/FasTC/>
*/
#ifndef PVRTCENCODER_SRC_IMAGE_H_
#define PVRTCENCODER_SRC_IMAGE_H_
#include "TexCompTypes.h"
#include "PVRTCCompressor.h"
namespace PVRTCC {
class Pixel;
class Image {
public:
Image(uint32 height, uint32 width);
Image(uint32 height, uint32 width, const Pixel *pixels);
Image(const Image &);
~Image();
void BilinearUpscale(uint32 times, EWrapMode wrapMode = eWrapMode_Clamp);
void ChangeBitDepth(const uint8 (&depths)[4]);
Pixel &operator()(uint32 i, uint32 j);
const Pixel &operator()(uint32 i, uint32 j) const;
private:
uint32 m_Width;
uint32 m_Height;
Pixel *m_Pixels;
const Pixel &GetPixel(int32 i, int32 j, EWrapMode wrapMode = eWrapMode_Clamp);
};
} // namespace PVRTCC
#endif // PVRTCENCODER_SRC_IMAGE_H_