assimp/code/PostProcessing/EmbedTexturesProcess.cpp

/*
Open Asset Import Library (assimp)
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*/

#include "EmbedTexturesProcess.h"
#include <assimp/ParsingUtils.h>
#include "ProcessHelper.h"

#include <fstream>

using namespace Assimp;

EmbedTexturesProcess::EmbedTexturesProcess()
: BaseProcess() {
}

EmbedTexturesProcess::~EmbedTexturesProcess() {
}

bool EmbedTexturesProcess::IsActive(unsigned int pFlags) const {
    return (pFlags & aiProcess_EmbedTextures) != 0;
}

void EmbedTexturesProcess::SetupProperties(const Importer* pImp) {
    mRootPath = pImp->GetPropertyString("sourceFilePath");
    mRootPath = mRootPath.substr(0, mRootPath.find_last_of("\\/") + 1u);
}

void EmbedTexturesProcess::Execute(aiScene* pScene) {
    if (pScene == nullptr || pScene->mRootNode == nullptr) return;

    aiString path;

    uint32_t embeddedTexturesCount = 0u;

    for (auto matId = 0u; matId < pScene->mNumMaterials; ++matId) {
        auto material = pScene->mMaterials[matId];

        for (auto ttId = 1u; ttId < AI_TEXTURE_TYPE_MAX; ++ttId) {
            auto tt = static_cast<aiTextureType>(ttId);
            auto texturesCount = material->GetTextureCount(tt);

            for (auto texId = 0u; texId < texturesCount; ++texId) {
                material->GetTexture(tt, texId, &path);
                if (path.data[0] == '*') continue; // Already embedded

                // Indeed embed
                if (addTexture(pScene, path.data)) {
                    auto embeddedTextureId = pScene->mNumTextures - 1u;
                    ::ai_snprintf(path.data, 1024, "*%u", embeddedTextureId);
                    material->AddProperty(&path, AI_MATKEY_TEXTURE(tt, texId));
                    embeddedTexturesCount++;
                }
            }
        }
    }

    ASSIMP_LOG_INFO_F("EmbedTexturesProcess finished. Embedded ", embeddedTexturesCount, " textures." );
}

bool EmbedTexturesProcess::addTexture(aiScene* pScene, std::string path) const {
    std::streampos imageSize = 0;
    std::string    imagePath = path;

    // Test path directly
    std::ifstream file(imagePath, std::ios::binary | std::ios::ate);
    if ((imageSize = file.tellg()) == std::streampos(-1)) {
        ASSIMP_LOG_WARN_F("EmbedTexturesProcess: Cannot find image: ", imagePath, ". Will try to find it in root folder.");

        // Test path in root path
        imagePath = mRootPath + path;
        file.open(imagePath, std::ios::binary | std::ios::ate);
        if ((imageSize = file.tellg()) == std::streampos(-1)) {
            // Test path basename in root path
            imagePath = mRootPath + path.substr(path.find_last_of("\\/") + 1u);
            file.open(imagePath, std::ios::binary | std::ios::ate);
            if ((imageSize = file.tellg()) == std::streampos(-1)) {
                ASSIMP_LOG_ERROR_F("EmbedTexturesProcess: Unable to embed texture: ", path, ".");
                return false;
            }
        }
    }

    aiTexel* imageContent = new aiTexel[ 1ul + static_cast<unsigned long>( imageSize ) / sizeof(aiTexel)];
    file.seekg(0, std::ios::beg);
    file.read(reinterpret_cast<char*>(imageContent), imageSize);

    // Enlarging the textures table
    unsigned int textureId = pScene->mNumTextures++;
    auto oldTextures = pScene->mTextures;
    pScene->mTextures = new aiTexture*[pScene->mNumTextures];
    ::memmove(pScene->mTextures, oldTextures, sizeof(aiTexture*) * (pScene->mNumTextures - 1u));
    delete [] oldTextures;
    
    // Add the new texture
    auto pTexture = new aiTexture;
    pTexture->mHeight = 0; // Means that this is still compressed
    pTexture->mWidth = static_cast<uint32_t>(imageSize);
    pTexture->pcData = imageContent;

    auto extension = path.substr(path.find_last_of('.') + 1u);
    std::transform(extension.begin(), extension.end(), extension.begin(), ToLower<char> );
    if (extension == "jpeg") {
        extension = "jpg";
    }

    size_t len = extension.size();
    if (len > HINTMAXTEXTURELEN -1 ) {
        len = HINTMAXTEXTURELEN - 1;
    }
    ::strncpy(pTexture->achFormatHint, extension.c_str(), len);
    pScene->mTextures[textureId] = pTexture;

    return true;
}