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0435f29f11
This patch introduces a jpg loader. For decoding the image, libjpeg-turbo library is used. Library was found to be fast (SIMD instructions accelerated) and portable. @issue: #517
102 lines
2.8 KiB
C++
Executable file
102 lines
2.8 KiB
C++
Executable file
/*
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* Copyright (c) 2021 Samsung Electronics Co., Ltd. All rights reserved.
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include "tvgLoaderMgr.h"
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#include "tvgJpgLoader.h"
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JpgLoader::JpgLoader()
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{
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jpegDecompressor = tjInitDecompress();
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}
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JpgLoader::~JpgLoader()
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{
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tjDestroy(jpegDecompressor);
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tjFree(image);
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image = NULL;
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}
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bool JpgLoader::open(const string& path)
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{
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bool success = false;
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FILE *jpegFile = NULL;
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if ((jpegFile = fopen(path.c_str(), "rb")) == NULL) return false;
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//determine size
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if (fseek(jpegFile, 0, SEEK_END) < 0) goto finalize;
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if (((size = ftell(jpegFile)) < 1)) goto finalize;
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if (fseek(jpegFile, 0, SEEK_SET)) goto finalize;
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if (data) tjFree(data);
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data = (unsigned char *) tjAlloc(size);
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if (!data) goto finalize;
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if (fread(data, size, 1, jpegFile) < 1) goto failure;
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success = true;
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goto finalize;
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failure:
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tjFree(data);
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data = NULL;
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finalize:
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fclose(jpegFile);
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return success;
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}
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bool JpgLoader::read()
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{
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int width, height;
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//decompress header
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int inSubsamp, inColorspace;
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if (tjDecompressHeader3(jpegDecompressor, data, size, &width, &height, &inSubsamp, &inColorspace) < 0) return false;
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//alloc image buffer
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if (image) tjFree(image);
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image = (unsigned char *)tjAlloc(width * height * tjPixelSize[TJPF_BGRX]);
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if (!image) return false;
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//decompress jpg image
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if (tjDecompress2(jpegDecompressor, data, size, image, width, 0, height, TJPF_BGRX, 0) < 0) {
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tjFree(image);
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data = NULL;
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return false;
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}
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vw = w = width;
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vh = h = height;
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return true;
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}
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bool JpgLoader::close()
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{
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tjFree(data);
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data = NULL;
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return true;
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}
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const uint32_t* JpgLoader::pixels()
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{
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return (const uint32_t*)image;
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}
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