/* * Small jpeg decoder library * * Copyright (c) 2006, Luc Saillard <luc@saillard.org> * All rights reserved. * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * - Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * - Neither the name of the author nor the names of its contributors may be * used to endorse or promote products derived from this software without * specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> #include "tinyjpeg.h" #include "tinyjpeg-internal.h" /* * Decode all the 3 components for 1x1 */ static void decode_MCU_1x1_3planes(struct jdec_private *priv) { // Y tinyjpeg_process_Huffman_data_unit(priv, cY); IDCT(&priv->component_infos[cY], priv->Y, 8); // Cb tinyjpeg_process_Huffman_data_unit(priv, cCb); IDCT(&priv->component_infos[cCb], priv->Cb, 8); // Cr tinyjpeg_process_Huffman_data_unit(priv, cCr); IDCT(&priv->component_infos[cCr], priv->Cr, 8); } /* * Decode a 2x1 * .-------. * | 1 | 2 | * `-------' */ static void decode_MCU_2x1_3planes(struct jdec_private *priv) { // Y tinyjpeg_process_Huffman_data_unit(priv, cY); IDCT(&priv->component_infos[cY], priv->Y, 16); tinyjpeg_process_Huffman_data_unit(priv, cY); IDCT(&priv->component_infos[cY], priv->Y+8, 16); // Cb tinyjpeg_process_Huffman_data_unit(priv, cCb); IDCT(&priv->component_infos[cCb], priv->Cb, 8); // Cr tinyjpeg_process_Huffman_data_unit(priv, cCr); IDCT(&priv->component_infos[cCr], priv->Cr, 8); } /* * Decode a 2x2 * .-------. * | 1 | 2 | * |---+---| * | 3 | 4 | * `-------' */ static void decode_MCU_2x2_3planes(struct jdec_private *priv) { // Y tinyjpeg_process_Huffman_data_unit(priv, cY); IDCT(&priv->component_infos[cY], priv->Y, 16); tinyjpeg_process_Huffman_data_unit(priv, cY); IDCT(&priv->component_infos[cY], priv->Y+8, 16); tinyjpeg_process_Huffman_data_unit(priv, cY); IDCT(&priv->component_infos[cY], priv->Y+64*2, 16); tinyjpeg_process_Huffman_data_unit(priv, cY); IDCT(&priv->component_infos[cY], priv->Y+64*2+8, 16); // Cb tinyjpeg_process_Huffman_data_unit(priv, cCb); IDCT(&priv->component_infos[cCb], priv->Cb, 8); // Cr tinyjpeg_process_Huffman_data_unit(priv, cCr); IDCT(&priv->component_infos[cCr], priv->Cr, 8); } /* * Decode a 1x2 mcu * .---. * | 1 | * |---| * | 2 | * `---' */ static void decode_MCU_1x2_3planes(struct jdec_private *priv) { // Y tinyjpeg_process_Huffman_data_unit(priv, cY); IDCT(&priv->component_infos[cY], priv->Y, 8); tinyjpeg_process_Huffman_data_unit(priv, cY); IDCT(&priv->component_infos[cY], priv->Y+64, 8); // Cb tinyjpeg_process_Huffman_data_unit(priv, cCb); IDCT(&priv->component_infos[cCb], priv->Cb, 8); // Cr tinyjpeg_process_Huffman_data_unit(priv, cCr); IDCT(&priv->component_infos[cCr], priv->Cr, 8); } const decode_MCU_fct tinyjpeg_decode_mcu_3comp_table[4] = { decode_MCU_1x1_3planes, decode_MCU_1x2_3planes, decode_MCU_2x1_3planes, decode_MCU_2x2_3planes, };