560 lines
18 KiB
C++
560 lines
18 KiB
C++
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/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "ktx.h"
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#include "SkBitmap.h"
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#include "SkStream.h"
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#include "SkEndian.h"
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#include "gl/GrGLDefines.h"
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#include "GrConfig.h"
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#include "etc1.h"
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static inline uint32_t compressed_fmt_to_gl_define(SkTextureCompressor::Format fmt) {
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static const uint32_t kGLDefineMap[SkTextureCompressor::kFormatCnt] = {
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GR_GL_COMPRESSED_LUMINANCE_LATC1, // kLATC_Format
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GR_GL_COMPRESSED_R11_EAC, // kR11_EAC_Format
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GR_GL_COMPRESSED_ETC1_RGB8, // kETC1_Format
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GR_GL_COMPRESSED_RGBA_ASTC_4x4_KHR, // kASTC_4x4_Format
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GR_GL_COMPRESSED_RGBA_ASTC_5x4_KHR, // kASTC_5x4_Format
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GR_GL_COMPRESSED_RGBA_ASTC_5x5_KHR, // kASTC_5x5_Format
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GR_GL_COMPRESSED_RGBA_ASTC_6x5_KHR, // kASTC_6x5_Format
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GR_GL_COMPRESSED_RGBA_ASTC_6x6_KHR, // kASTC_6x6_Format
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GR_GL_COMPRESSED_RGBA_ASTC_8x5_KHR, // kASTC_8x5_Format
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GR_GL_COMPRESSED_RGBA_ASTC_8x6_KHR, // kASTC_8x6_Format
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GR_GL_COMPRESSED_RGBA_ASTC_8x8_KHR, // kASTC_8x8_Format
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GR_GL_COMPRESSED_RGBA_ASTC_10x5_KHR, // kASTC_10x5_Format
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GR_GL_COMPRESSED_RGBA_ASTC_10x6_KHR, // kASTC_10x6_Format
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GR_GL_COMPRESSED_RGBA_ASTC_10x8_KHR, // kASTC_10x8_Format
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GR_GL_COMPRESSED_RGBA_ASTC_10x10_KHR, // kASTC_10x10_Format
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GR_GL_COMPRESSED_RGBA_ASTC_12x10_KHR, // kASTC_12x10_Format
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GR_GL_COMPRESSED_RGBA_ASTC_12x12_KHR, // kASTC_12x12_Format
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};
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GR_STATIC_ASSERT(0 == SkTextureCompressor::kLATC_Format);
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GR_STATIC_ASSERT(1 == SkTextureCompressor::kR11_EAC_Format);
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GR_STATIC_ASSERT(2 == SkTextureCompressor::kETC1_Format);
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GR_STATIC_ASSERT(3 == SkTextureCompressor::kASTC_4x4_Format);
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GR_STATIC_ASSERT(4 == SkTextureCompressor::kASTC_5x4_Format);
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GR_STATIC_ASSERT(5 == SkTextureCompressor::kASTC_5x5_Format);
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GR_STATIC_ASSERT(6 == SkTextureCompressor::kASTC_6x5_Format);
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GR_STATIC_ASSERT(7 == SkTextureCompressor::kASTC_6x6_Format);
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GR_STATIC_ASSERT(8 == SkTextureCompressor::kASTC_8x5_Format);
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GR_STATIC_ASSERT(9 == SkTextureCompressor::kASTC_8x6_Format);
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GR_STATIC_ASSERT(10 == SkTextureCompressor::kASTC_8x8_Format);
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GR_STATIC_ASSERT(11 == SkTextureCompressor::kASTC_10x5_Format);
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GR_STATIC_ASSERT(12 == SkTextureCompressor::kASTC_10x6_Format);
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GR_STATIC_ASSERT(13 == SkTextureCompressor::kASTC_10x8_Format);
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GR_STATIC_ASSERT(14 == SkTextureCompressor::kASTC_10x10_Format);
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GR_STATIC_ASSERT(15 == SkTextureCompressor::kASTC_12x10_Format);
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GR_STATIC_ASSERT(16 == SkTextureCompressor::kASTC_12x12_Format);
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GR_STATIC_ASSERT(SK_ARRAY_COUNT(kGLDefineMap) == SkTextureCompressor::kFormatCnt);
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return kGLDefineMap[fmt];
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}
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#define KTX_FILE_IDENTIFIER_SIZE 12
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static const uint8_t KTX_FILE_IDENTIFIER[KTX_FILE_IDENTIFIER_SIZE] = {
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0xAB, 0x4B, 0x54, 0x58, 0x20, 0x31, 0x31, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A
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};
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static const uint32_t kKTX_ENDIANNESS_CODE = 0x04030201;
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bool SkKTXFile::KeyValue::readKeyAndValue(const uint8_t* data) {
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const char *key = reinterpret_cast<const char *>(data);
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const char *value = key;
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size_t bytesRead = 0;
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while (*value != '\0' && bytesRead < this->fDataSz) {
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++bytesRead;
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++value;
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}
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// Error of some sort..
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if (bytesRead >= this->fDataSz) {
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return false;
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}
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// Read the zero terminator
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++bytesRead;
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++value;
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size_t bytesLeft = this->fDataSz - bytesRead;
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// We ignore the null terminator when setting the string value.
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this->fKey.set(key, bytesRead - 1);
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if (bytesLeft > 0) {
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this->fValue.set(value, bytesLeft - 1);
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} else {
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return false;
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}
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return true;
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}
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bool SkKTXFile::KeyValue::writeKeyAndValueForKTX(SkWStream* strm) {
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size_t bytesWritten = 0;
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if (!strm->write(&(this->fDataSz), 4)) {
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return false;
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}
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bytesWritten += 4;
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// Here we know that C-strings must end with a null terminating
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// character, so when we get a c_str(), it will have as many
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// bytes of data as size() returns plus a zero, so we just
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// write size() + 1 bytes into the stream.
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size_t keySize = this->fKey.size() + 1;
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if (!strm->write(this->fKey.c_str(), keySize)) {
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return false;
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}
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bytesWritten += keySize;
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size_t valueSize = this->fValue.size() + 1;
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if (!strm->write(this->fValue.c_str(), valueSize)) {
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return false;
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}
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bytesWritten += valueSize;
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size_t bytesWrittenPadFour = (bytesWritten + 3) & ~3;
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uint8_t nullBuf[4] = { 0, 0, 0, 0 };
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size_t padding = bytesWrittenPadFour - bytesWritten;
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SkASSERT(padding < 4);
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return strm->write(nullBuf, padding);
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}
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uint32_t SkKTXFile::readInt(const uint8_t** buf, size_t* bytesLeft) const {
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SkASSERT(buf && bytesLeft);
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uint32_t result;
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if (*bytesLeft < 4) {
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SkASSERT(false);
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return 0;
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}
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memcpy(&result, *buf, 4);
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*buf += 4;
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if (fSwapBytes) {
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SkEndianSwap32(result);
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}
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*bytesLeft -= 4;
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return result;
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}
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SkString SkKTXFile::getValueForKey(const SkString& key) const {
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const KeyValue *begin = this->fKeyValuePairs.begin();
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const KeyValue *end = this->fKeyValuePairs.end();
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for (const KeyValue *kv = begin; kv != end; ++kv) {
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if (kv->key() == key) {
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return kv->value();
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}
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}
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return SkString();
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}
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bool SkKTXFile::isCompressedFormat(SkTextureCompressor::Format fmt) const {
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if (!this->valid()) {
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return false;
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}
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// This has many aliases
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bool isFmt = false;
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if (fmt == SkTextureCompressor::kLATC_Format) {
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isFmt = GR_GL_COMPRESSED_RED_RGTC1 == fHeader.fGLInternalFormat ||
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GR_GL_COMPRESSED_3DC_X == fHeader.fGLInternalFormat;
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}
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return isFmt || compressed_fmt_to_gl_define(fmt) == fHeader.fGLInternalFormat;
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}
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bool SkKTXFile::isRGBA8() const {
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return this->valid() && GR_GL_RGBA8 == fHeader.fGLInternalFormat;
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}
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bool SkKTXFile::isRGB8() const {
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return this->valid() && GR_GL_RGB8 == fHeader.fGLInternalFormat;
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}
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bool SkKTXFile::readKTXFile(const uint8_t* data, size_t dataLen) {
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const uint8_t *buf = data;
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size_t bytesLeft = dataLen;
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// Make sure original KTX header is there... this should have been checked
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// already by a call to is_ktx()
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SkASSERT(bytesLeft > KTX_FILE_IDENTIFIER_SIZE);
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SkASSERT(0 == memcmp(KTX_FILE_IDENTIFIER, buf, KTX_FILE_IDENTIFIER_SIZE));
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buf += KTX_FILE_IDENTIFIER_SIZE;
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bytesLeft -= KTX_FILE_IDENTIFIER_SIZE;
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// Read header, but first make sure that we have the proper space: we need
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// two 32-bit ints: 1 for endianness, and another for the mandatory image
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// size after the header.
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if (bytesLeft < 8 + sizeof(Header)) {
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return false;
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}
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uint32_t endianness = this->readInt(&buf, &bytesLeft);
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fSwapBytes = kKTX_ENDIANNESS_CODE != endianness;
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// Read header values
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fHeader.fGLType = this->readInt(&buf, &bytesLeft);
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fHeader.fGLTypeSize = this->readInt(&buf, &bytesLeft);
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fHeader.fGLFormat = this->readInt(&buf, &bytesLeft);
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fHeader.fGLInternalFormat = this->readInt(&buf, &bytesLeft);
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fHeader.fGLBaseInternalFormat = this->readInt(&buf, &bytesLeft);
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fHeader.fPixelWidth = this->readInt(&buf, &bytesLeft);
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fHeader.fPixelHeight = this->readInt(&buf, &bytesLeft);
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fHeader.fPixelDepth = this->readInt(&buf, &bytesLeft);
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fHeader.fNumberOfArrayElements = this->readInt(&buf, &bytesLeft);
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fHeader.fNumberOfFaces = this->readInt(&buf, &bytesLeft);
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fHeader.fNumberOfMipmapLevels = this->readInt(&buf, &bytesLeft);
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fHeader.fBytesOfKeyValueData = this->readInt(&buf, &bytesLeft);
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// Check for things that we understand...
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{
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// First, we only support compressed formats and single byte
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// representations at the moment. If the internal format is
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// compressed, the the GLType field in the header must be zero.
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// In the future, we may support additional data types (such
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// as GL_UNSIGNED_SHORT_5_6_5)
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if (fHeader.fGLType != 0 && fHeader.fGLType != GR_GL_UNSIGNED_BYTE) {
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return false;
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}
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// This means that for well-formatted KTX files, the glTypeSize
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// field must be one...
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if (fHeader.fGLTypeSize != 1) {
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return false;
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}
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// We don't support 3D textures.
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if (fHeader.fPixelDepth > 1) {
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return false;
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}
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// We don't support texture arrays
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if (fHeader.fNumberOfArrayElements > 1) {
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return false;
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}
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// We don't support cube maps
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if (fHeader.fNumberOfFaces > 1) {
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return false;
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}
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// We don't support width and/or height <= 0
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if (fHeader.fPixelWidth <= 0 || fHeader.fPixelHeight <= 0) {
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return false;
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}
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}
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// Make sure that we have enough bytes left for the key/value
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// data according to what was said in the header.
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if (bytesLeft < fHeader.fBytesOfKeyValueData) {
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return false;
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}
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// Next read the key value pairs
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size_t keyValueBytesRead = 0;
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while (keyValueBytesRead < fHeader.fBytesOfKeyValueData) {
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uint32_t keyValueBytes = this->readInt(&buf, &bytesLeft);
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keyValueBytesRead += 4;
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if (keyValueBytes > bytesLeft) {
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return false;
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}
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KeyValue kv(keyValueBytes);
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if (!kv.readKeyAndValue(buf)) {
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return false;
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}
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fKeyValuePairs.push_back(kv);
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uint32_t keyValueBytesPadded = (keyValueBytes + 3) & ~3;
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buf += keyValueBytesPadded;
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keyValueBytesRead += keyValueBytesPadded;
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bytesLeft -= keyValueBytesPadded;
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}
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// Read the pixel data...
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int mipmaps = SkMax32(fHeader.fNumberOfMipmapLevels, 1);
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SkASSERT(mipmaps == 1);
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int arrayElements = SkMax32(fHeader.fNumberOfArrayElements, 1);
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SkASSERT(arrayElements == 1);
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int faces = SkMax32(fHeader.fNumberOfFaces, 1);
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SkASSERT(faces == 1);
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int depth = SkMax32(fHeader.fPixelDepth, 1);
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SkASSERT(depth == 1);
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for (int mipmap = 0; mipmap < mipmaps; ++mipmap) {
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// Make sure that we have at least 4 more bytes for the first image size
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if (bytesLeft < 4) {
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return false;
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}
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uint32_t imgSize = this->readInt(&buf, &bytesLeft);
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// Truncated file.
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if (bytesLeft < imgSize) {
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return false;
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}
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// !FIXME! If support is ever added for cube maps then the padding
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// needs to be taken into account here.
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for (int arrayElement = 0; arrayElement < arrayElements; ++arrayElement) {
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for (int face = 0; face < faces; ++face) {
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for (int z = 0; z < depth; ++z) {
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PixelData pd(buf, imgSize);
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fPixelData.append(1, &pd);
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}
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}
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}
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uint32_t imgSizePadded = (imgSize + 3) & ~3;
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buf += imgSizePadded;
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bytesLeft -= imgSizePadded;
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}
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return bytesLeft == 0;
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}
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bool SkKTXFile::is_ktx(const uint8_t *data) {
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return 0 == memcmp(KTX_FILE_IDENTIFIER, data, KTX_FILE_IDENTIFIER_SIZE);
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}
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bool SkKTXFile::is_ktx(SkStreamRewindable* stream) {
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// Read the KTX header and make sure it's valid.
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unsigned char buf[KTX_FILE_IDENTIFIER_SIZE];
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bool largeEnough =
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stream->read((void*)buf, KTX_FILE_IDENTIFIER_SIZE) == KTX_FILE_IDENTIFIER_SIZE;
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stream->rewind();
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if (!largeEnough) {
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return false;
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}
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return is_ktx(buf);
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}
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SkKTXFile::KeyValue SkKTXFile::CreateKeyValue(const char *cstrKey, const char *cstrValue) {
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SkString key(cstrKey);
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SkString value(cstrValue);
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// Size of buffer is length of string plus the null terminators...
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size_t size = key.size() + 1 + value.size() + 1;
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SkAutoSMalloc<256> buf(size);
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uint8_t* kvBuf = reinterpret_cast<uint8_t*>(buf.get());
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memcpy(kvBuf, key.c_str(), key.size() + 1);
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memcpy(kvBuf + key.size() + 1, value.c_str(), value.size() + 1);
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KeyValue kv(size);
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SkAssertResult(kv.readKeyAndValue(kvBuf));
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return kv;
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}
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bool SkKTXFile::WriteETC1ToKTX(SkWStream* stream, const uint8_t *etc1Data,
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uint32_t width, uint32_t height) {
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// First thing's first, write out the magic identifier and endianness...
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if (!stream->write(KTX_FILE_IDENTIFIER, KTX_FILE_IDENTIFIER_SIZE)) {
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return false;
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}
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if (!stream->write(&kKTX_ENDIANNESS_CODE, 4)) {
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return false;
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}
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Header hdr;
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hdr.fGLType = 0;
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hdr.fGLTypeSize = 1;
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hdr.fGLFormat = 0;
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hdr.fGLInternalFormat = GR_GL_COMPRESSED_ETC1_RGB8;
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hdr.fGLBaseInternalFormat = GR_GL_RGB;
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hdr.fPixelWidth = width;
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hdr.fPixelHeight = height;
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hdr.fNumberOfArrayElements = 0;
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hdr.fNumberOfFaces = 1;
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hdr.fNumberOfMipmapLevels = 1;
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// !FIXME! The spec suggests that we put KTXOrientation as a
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// key value pair in the header, but that means that we'd have to
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// pipe through the bitmap's orientation to properly do that.
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hdr.fBytesOfKeyValueData = 0;
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// Write the header
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if (!stream->write(&hdr, sizeof(hdr))) {
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return false;
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}
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// Write the size of the image data
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etc1_uint32 dataSize = etc1_get_encoded_data_size(width, height);
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if (!stream->write(&dataSize, 4)) {
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return false;
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}
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// Write the actual image data
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if (!stream->write(etc1Data, dataSize)) {
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return false;
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}
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return true;
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}
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bool SkKTXFile::WriteBitmapToKTX(SkWStream* stream, const SkBitmap& bitmap) {
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const SkColorType ct = bitmap.colorType();
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SkAutoLockPixels alp(bitmap);
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const int width = bitmap.width();
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const int height = bitmap.width();
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const uint8_t* src = reinterpret_cast<uint8_t*>(bitmap.getPixels());
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if (NULL == bitmap.getPixels()) {
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return false;
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}
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// First thing's first, write out the magic identifier and endianness...
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if (!stream->write(KTX_FILE_IDENTIFIER, KTX_FILE_IDENTIFIER_SIZE) ||
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!stream->write(&kKTX_ENDIANNESS_CODE, 4)) {
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return false;
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}
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// Collect our key/value pairs...
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SkTArray<KeyValue> kvPairs;
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// Next, write the header based on the bitmap's config.
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Header hdr;
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switch (ct) {
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case kIndex_8_SkColorType:
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// There is a compressed format for this, but we don't support it yet.
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SkDebugf("Writing indexed bitmap to KTX unsupported.\n");
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// VVV fall through VVV
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default:
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case kUnknown_SkColorType:
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// Bitmap hasn't been configured.
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return false;
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case kAlpha_8_SkColorType:
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hdr.fGLType = GR_GL_UNSIGNED_BYTE;
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hdr.fGLTypeSize = 1;
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hdr.fGLFormat = GR_GL_RED;
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hdr.fGLInternalFormat = GR_GL_R8;
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hdr.fGLBaseInternalFormat = GR_GL_RED;
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break;
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case kRGB_565_SkColorType:
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hdr.fGLType = GR_GL_UNSIGNED_SHORT_5_6_5;
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hdr.fGLTypeSize = 2;
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hdr.fGLFormat = GR_GL_RGB;
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hdr.fGLInternalFormat = GR_GL_RGB;
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hdr.fGLBaseInternalFormat = GR_GL_RGB;
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break;
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case kARGB_4444_SkColorType:
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hdr.fGLType = GR_GL_UNSIGNED_SHORT_4_4_4_4;
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hdr.fGLTypeSize = 2;
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hdr.fGLFormat = GR_GL_RGBA;
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hdr.fGLInternalFormat = GR_GL_RGBA4;
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hdr.fGLBaseInternalFormat = GR_GL_RGBA;
|
|
kvPairs.push_back(CreateKeyValue("KTXPremultipliedAlpha", "True"));
|
|
break;
|
|
|
|
case kN32_SkColorType:
|
|
hdr.fGLType = GR_GL_UNSIGNED_BYTE;
|
|
hdr.fGLTypeSize = 1;
|
|
hdr.fGLFormat = GR_GL_RGBA;
|
|
hdr.fGLInternalFormat = GR_GL_RGBA8;
|
|
hdr.fGLBaseInternalFormat = GR_GL_RGBA;
|
|
kvPairs.push_back(CreateKeyValue("KTXPremultipliedAlpha", "True"));
|
|
break;
|
|
}
|
|
|
|
// Everything else in the header is shared.
|
|
hdr.fPixelWidth = width;
|
|
hdr.fPixelHeight = height;
|
|
hdr.fNumberOfArrayElements = 0;
|
|
hdr.fNumberOfFaces = 1;
|
|
hdr.fNumberOfMipmapLevels = 1;
|
|
|
|
// Calculate the key value data size
|
|
hdr.fBytesOfKeyValueData = 0;
|
|
for (KeyValue *kv = kvPairs.begin(); kv != kvPairs.end(); ++kv) {
|
|
// Key value size is the size of the key value data,
|
|
// four bytes for saying how big the key value size is
|
|
// and then additional bytes for padding to four byte boundary
|
|
size_t kvsize = kv->size();
|
|
kvsize += 4;
|
|
kvsize = (kvsize + 3) & ~3;
|
|
hdr.fBytesOfKeyValueData = SkToU32(hdr.fBytesOfKeyValueData + kvsize);
|
|
}
|
|
|
|
// Write the header
|
|
if (!stream->write(&hdr, sizeof(hdr))) {
|
|
return false;
|
|
}
|
|
|
|
// Write out each key value pair
|
|
for (KeyValue *kv = kvPairs.begin(); kv != kvPairs.end(); ++kv) {
|
|
if (!kv->writeKeyAndValueForKTX(stream)) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
// Calculate the size of the data
|
|
int bpp = bitmap.bytesPerPixel();
|
|
uint32_t dataSz = bpp * width * height;
|
|
|
|
if (0 >= bpp) {
|
|
return false;
|
|
}
|
|
|
|
// Write it into the buffer
|
|
if (!stream->write(&dataSz, 4)) {
|
|
return false;
|
|
}
|
|
|
|
// Write the pixel data...
|
|
const uint8_t* rowPtr = src;
|
|
if (kN32_SkColorType == ct) {
|
|
for (int j = 0; j < height; ++j) {
|
|
const uint32_t* pixelsPtr = reinterpret_cast<const uint32_t*>(rowPtr);
|
|
for (int i = 0; i < width; ++i) {
|
|
uint32_t pixel = pixelsPtr[i];
|
|
uint8_t dstPixel[4];
|
|
dstPixel[0] = pixel >> SK_R32_SHIFT;
|
|
dstPixel[1] = pixel >> SK_G32_SHIFT;
|
|
dstPixel[2] = pixel >> SK_B32_SHIFT;
|
|
dstPixel[3] = pixel >> SK_A32_SHIFT;
|
|
if (!stream->write(dstPixel, 4)) {
|
|
return false;
|
|
}
|
|
}
|
|
rowPtr += bitmap.rowBytes();
|
|
}
|
|
} else {
|
|
for (int i = 0; i < height; ++i) {
|
|
if (!stream->write(rowPtr, bpp*width)) {
|
|
return false;
|
|
}
|
|
rowPtr += bitmap.rowBytes();
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|