diff options
Diffstat (limited to 'contrib/syslinux-4.02/com32/lib/jpeg/decode1.c')
| -rw-r--r-- | contrib/syslinux-4.02/com32/lib/jpeg/decode1.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/lib/jpeg/decode1.c b/contrib/syslinux-4.02/com32/lib/jpeg/decode1.c new file mode 100644 index 0000000..554f7f1 --- /dev/null +++ b/contrib/syslinux-4.02/com32/lib/jpeg/decode1.c @@ -0,0 +1,138 @@ +/* + * 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 a 1x1 directly in 1 color + */ +static void decode_MCU_1x1_1plane(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_1plane(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); + + // Cr + tinyjpeg_process_Huffman_data_unit(priv, cCr); +} + + +/* + * Decode a 2x2 directly in GREY format (8bits) + * .-------. + * | 1 | 2 | + * |---+---| + * | 3 | 4 | + * `-------' + */ +static void decode_MCU_2x2_1plane(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); + + // Cr + tinyjpeg_process_Huffman_data_unit(priv, cCr); +} + +/* + * Decode a 1x2 mcu + * .---. + * | 1 | + * |---| + * | 2 | + * `---' + */ +static void decode_MCU_1x2_1plane(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); + + // Cr + tinyjpeg_process_Huffman_data_unit(priv, cCr); +} + +const decode_MCU_fct tinyjpeg_decode_mcu_1comp_table[4] = { + decode_MCU_1x1_1plane, + decode_MCU_1x2_1plane, + decode_MCU_2x1_1plane, + decode_MCU_2x2_1plane, +}; |