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426 lines
11 KiB
C++
426 lines
11 KiB
C++
/*
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* Copyright 2015 The Etc2Comp Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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EtcBlock4x4.cpp
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Implements the state associated with each 4x4 block of pixels in an image
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Source images that are not a multiple of 4x4 are extended to fill the Block4x4 using pixels with an
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alpha of NAN
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*/
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#include "EtcConfig.h"
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#include "EtcBlock4x4.h"
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#include "EtcBlock4x4EncodingBits.h"
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#include "EtcColor.h"
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#include "EtcImage.h"
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#include "EtcColorFloatRGBA.h"
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#include "EtcBlock4x4Encoding_RGB8.h"
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#include "EtcBlock4x4Encoding_RGBA8.h"
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#include "EtcBlock4x4Encoding_RGB8A1.h"
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#include "EtcBlock4x4Encoding_R11.h"
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#include "EtcBlock4x4Encoding_RG11.h"
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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namespace Etc
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{
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// ETC pixels are scanned vertically.
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// this mapping is for when someone wants to scan the ETC pixels horizontally
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const unsigned int Block4x4::s_auiPixelOrderHScan[PIXELS] = { 0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, 3, 7, 11, 15 };
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// ----------------------------------------------------------------------------------------------------
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//
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Block4x4::Block4x4(void)
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{
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m_pimageSource = nullptr;
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m_uiSourceH = 0;
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m_uiSourceV = 0;
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m_sourcealphamix = SourceAlphaMix::UNKNOWN;
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m_boolBorderPixels = false;
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m_boolPunchThroughPixels = false;
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m_pencoding = nullptr;
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m_errormetric = ErrorMetric::NUMERIC;
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}
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Block4x4::~Block4x4()
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{
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m_pimageSource = nullptr;
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if (m_pencoding)
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{
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delete m_pencoding;
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m_pencoding = nullptr;
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}
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}
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// ----------------------------------------------------------------------------------------------------
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// initialization prior to encoding from a source image
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// [a_uiSourceH,a_uiSourceV] is the location of the block in a_pimageSource
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// a_paucEncodingBits is the place to store the final encoding
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// a_errormetric is used for finding the best encoding
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//
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void Block4x4::InitFromSource(Image *a_pimageSource,
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unsigned int a_uiSourceH, unsigned int a_uiSourceV,
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unsigned char *a_paucEncodingBits,
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ErrorMetric a_errormetric)
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{
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Block4x4();
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m_pimageSource = a_pimageSource;
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m_uiSourceH = a_uiSourceH;
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m_uiSourceV = a_uiSourceV;
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m_errormetric = a_errormetric;
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SetSourcePixels();
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// set block encoder function
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switch (m_pimageSource->GetFormat())
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{
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case Image::Format::ETC1:
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m_pencoding = new Block4x4Encoding_ETC1;
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break;
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case Image::Format::RGB8:
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case Image::Format::SRGB8:
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m_pencoding = new Block4x4Encoding_RGB8;
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break;
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case Image::Format::RGBA8:
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case Image::Format::SRGBA8:
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if (a_errormetric == RGBX)
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{
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m_pencoding = new Block4x4Encoding_RGBA8;
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}
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else
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{
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switch (m_sourcealphamix)
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{
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case SourceAlphaMix::OPAQUE:
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m_pencoding = new Block4x4Encoding_RGBA8_Opaque;
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break;
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case SourceAlphaMix::TRANSPARENT:
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m_pencoding = new Block4x4Encoding_RGBA8_Transparent;
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break;
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case SourceAlphaMix::TRANSLUCENT:
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m_pencoding = new Block4x4Encoding_RGBA8;
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break;
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default:
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assert(0);
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break;
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}
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break;
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}
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break;
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case Image::Format::RGB8A1:
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case Image::Format::SRGB8A1:
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switch (m_sourcealphamix)
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{
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case SourceAlphaMix::OPAQUE:
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m_pencoding = new Block4x4Encoding_RGB8A1_Opaque;
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break;
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case SourceAlphaMix::TRANSPARENT:
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m_pencoding = new Block4x4Encoding_RGB8A1_Transparent;
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break;
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case SourceAlphaMix::TRANSLUCENT:
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if (m_boolPunchThroughPixels)
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{
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m_pencoding = new Block4x4Encoding_RGB8A1;
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}
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else
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{
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m_pencoding = new Block4x4Encoding_RGB8A1_Opaque;
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}
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break;
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default:
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assert(0);
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break;
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}
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break;
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case Image::Format::R11:
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case Image::Format::SIGNED_R11:
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m_pencoding = new Block4x4Encoding_R11;
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break;
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case Image::Format::RG11:
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case Image::Format::SIGNED_RG11:
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m_pencoding = new Block4x4Encoding_RG11;
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break;
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default:
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assert(0);
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break;
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}
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m_pencoding->InitFromSource(this, m_afrgbaSource,
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a_paucEncodingBits, a_errormetric);
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}
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// ----------------------------------------------------------------------------------------------------
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// initialization of encoding state from a prior encoding using encoding bits
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// [a_uiSourceH,a_uiSourceV] is the location of the block in a_pimageSource
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// a_paucEncodingBits is the place to read the prior encoding
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// a_imageformat is used to determine how to interpret a_paucEncodingBits
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// a_errormetric was used for the prior encoding
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//
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void Block4x4::InitFromEtcEncodingBits(Image::Format a_imageformat,
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unsigned int a_uiSourceH, unsigned int a_uiSourceV,
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unsigned char *a_paucEncodingBits,
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Image *a_pimageSource,
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ErrorMetric a_errormetric)
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{
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Block4x4();
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m_pimageSource = a_pimageSource;
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m_uiSourceH = a_uiSourceH;
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m_uiSourceV = a_uiSourceV;
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m_errormetric = a_errormetric;
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SetSourcePixels();
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// set block encoder function
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switch (a_imageformat)
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{
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case Image::Format::ETC1:
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m_pencoding = new Block4x4Encoding_ETC1;
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break;
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case Image::Format::RGB8:
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case Image::Format::SRGB8:
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m_pencoding = new Block4x4Encoding_RGB8;
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break;
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case Image::Format::RGBA8:
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case Image::Format::SRGBA8:
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m_pencoding = new Block4x4Encoding_RGBA8;
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break;
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case Image::Format::RGB8A1:
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case Image::Format::SRGB8A1:
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m_pencoding = new Block4x4Encoding_RGB8A1;
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break;
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case Image::Format::R11:
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case Image::Format::SIGNED_R11:
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m_pencoding = new Block4x4Encoding_R11;
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break;
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case Image::Format::RG11:
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case Image::Format::SIGNED_RG11:
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m_pencoding = new Block4x4Encoding_RG11;
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break;
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default:
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assert(0);
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break;
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}
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m_pencoding->InitFromEncodingBits(this, a_paucEncodingBits, m_afrgbaSource,
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m_pimageSource->GetErrorMetric());
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}
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// ----------------------------------------------------------------------------------------------------
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// set source pixels from m_pimageSource
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// set m_alphamix
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//
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void Block4x4::SetSourcePixels(void)
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{
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Image::Format imageformat = m_pimageSource->GetFormat();
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// alpha census
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unsigned int uiTransparentSourcePixels = 0;
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unsigned int uiOpaqueSourcePixels = 0;
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// copy source to consecutive memory locations
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// convert from image horizontal scan to block vertical scan
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unsigned int uiPixel = 0;
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for (unsigned int uiBlockPixelH = 0; uiBlockPixelH < Block4x4::COLUMNS; uiBlockPixelH++)
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{
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unsigned int uiSourcePixelH = m_uiSourceH + uiBlockPixelH;
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for (unsigned int uiBlockPixelV = 0; uiBlockPixelV < Block4x4::ROWS; uiBlockPixelV++)
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{
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unsigned int uiSourcePixelV = m_uiSourceV + uiBlockPixelV;
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ColorFloatRGBA *pfrgbaSource = m_pimageSource->GetSourcePixel(uiSourcePixelH, uiSourcePixelV);
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// if pixel extends beyond source image because of block padding
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if (pfrgbaSource == nullptr)
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{
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m_afrgbaSource[uiPixel] = ColorFloatRGBA(0.0f, 0.0f, 0.0f, NAN); // denotes border pixel
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m_boolBorderPixels = true;
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uiTransparentSourcePixels++;
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}
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else
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{
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//get teh current pixel data, and store some of the attributes
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//before capping values to fit the encoder type
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m_afrgbaSource[uiPixel] = (*pfrgbaSource).ClampRGBA();
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if (m_afrgbaSource[uiPixel].fA == 1.0f || m_errormetric == RGBX)
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{
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m_pimageSource->m_iNumOpaquePixels++;
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}
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else if (m_afrgbaSource[uiPixel].fA == 0.0f)
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{
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m_pimageSource->m_iNumTransparentPixels++;
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}
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else if(m_afrgbaSource[uiPixel].fA > 0.0f && m_afrgbaSource[uiPixel].fA < 1.0f)
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{
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m_pimageSource->m_iNumTranslucentPixels++;
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}
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else
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{
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m_pimageSource->m_numOutOfRangeValues.fA++;
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}
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if (m_afrgbaSource[uiPixel].fR != 0.0f)
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{
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m_pimageSource->m_numColorValues.fR++;
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//make sure we are getting a float between 0-1
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if (m_afrgbaSource[uiPixel].fR - 1.0f > 0.0f)
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{
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m_pimageSource->m_numOutOfRangeValues.fR++;
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}
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}
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if (m_afrgbaSource[uiPixel].fG != 0.0f)
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{
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m_pimageSource->m_numColorValues.fG++;
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if (m_afrgbaSource[uiPixel].fG - 1.0f > 0.0f)
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{
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m_pimageSource->m_numOutOfRangeValues.fG++;
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}
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}
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if (m_afrgbaSource[uiPixel].fB != 0.0f)
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{
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m_pimageSource->m_numColorValues.fB++;
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if (m_afrgbaSource[uiPixel].fB - 1.0f > 0.0f)
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{
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m_pimageSource->m_numOutOfRangeValues.fB++;
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}
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}
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// for formats with no alpha, set source alpha to 1
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if (imageformat == Image::Format::ETC1 ||
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imageformat == Image::Format::RGB8 ||
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imageformat == Image::Format::SRGB8)
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{
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m_afrgbaSource[uiPixel].fA = 1.0f;
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}
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if (imageformat == Image::Format::R11 ||
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imageformat == Image::Format::SIGNED_R11)
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{
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m_afrgbaSource[uiPixel].fA = 1.0f;
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m_afrgbaSource[uiPixel].fG = 0.0f;
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m_afrgbaSource[uiPixel].fB = 0.0f;
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}
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if (imageformat == Image::Format::RG11 ||
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imageformat == Image::Format::SIGNED_RG11)
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{
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m_afrgbaSource[uiPixel].fA = 1.0f;
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m_afrgbaSource[uiPixel].fB = 0.0f;
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}
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// for RGB8A1, set source alpha to 0.0 or 1.0
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// set punch through flag
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if (imageformat == Image::Format::RGB8A1 ||
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imageformat == Image::Format::SRGB8A1)
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{
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if (m_afrgbaSource[uiPixel].fA >= 0.5f)
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{
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m_afrgbaSource[uiPixel].fA = 1.0f;
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}
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else
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{
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m_afrgbaSource[uiPixel].fA = 0.0f;
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m_boolPunchThroughPixels = true;
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}
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}
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if (m_afrgbaSource[uiPixel].fA == 1.0f || m_errormetric == RGBX)
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{
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uiOpaqueSourcePixels++;
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}
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else if (m_afrgbaSource[uiPixel].fA == 0.0f)
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{
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uiTransparentSourcePixels++;
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}
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}
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uiPixel += 1;
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}
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}
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if (uiOpaqueSourcePixels == PIXELS)
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{
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m_sourcealphamix = SourceAlphaMix::OPAQUE;
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}
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else if (uiTransparentSourcePixels == PIXELS)
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{
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m_sourcealphamix = SourceAlphaMix::TRANSPARENT;
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}
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else
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{
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m_sourcealphamix = SourceAlphaMix::TRANSLUCENT;
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}
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}
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// ----------------------------------------------------------------------------------------------------
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// return a name for the encoding mode
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//
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const char * Block4x4::GetEncodingModeName(void)
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{
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switch (m_pencoding->GetMode())
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{
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case Block4x4Encoding::MODE_ETC1:
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return "ETC1";
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case Block4x4Encoding::MODE_T:
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return "T";
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case Block4x4Encoding::MODE_H:
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return "H";
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case Block4x4Encoding::MODE_PLANAR:
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return "PLANAR";
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default:
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return "???";
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}
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}
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// ----------------------------------------------------------------------------------------------------
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//
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}
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