Update jpeg.cpp
Remove leftover header, fix title case, convert multi line comments into single line comments, add some spacing, add newline, add TODO to find a better resource instead of French Wikipedia
This commit is contained in:
Derek "Turtle" Roe
parent
94e7a2dfae
commit
e00a90e14e
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@ -1,11 +1,3 @@
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// Project64 - A Nintendo 64 emulator
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// http://www.pj64-emu.com/
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// Copyright(C) 2001-2021 Project64
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// Copyright(C) 2012 Bobby Smiles
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// Copyright(C) 2009 Richard Goedeken
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// Copyright(C) 2002 Hacktarux
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// GNU/GPLv2 licensed: https://gnu.org/licenses/gpl-2.0.html
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#include "stdafx.h"
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#include <stdlib.h>
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@ -17,27 +9,27 @@
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typedef void(*tile_line_emitter_t)(CHle * hle, const int16_t *y, const int16_t *u, uint32_t address);
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typedef void(*subblock_transform_t)(int16_t *dst, const int16_t *src);
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/* standard jpeg ucode decoder */
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// Standard JPEG microcode decoder
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static void jpeg_decode_std(CHle * hle,
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const char *const version,
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const subblock_transform_t transform_luma,
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const subblock_transform_t transform_chroma,
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const tile_line_emitter_t emit_line);
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/* helper functions */
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// Helper functions
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static uint8_t clamp_u8(int16_t x);
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static int16_t clamp_s12(int16_t x);
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static uint16_t clamp_RGBA_component(int16_t x);
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/* pixel conversion & formatting */
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// Pixel conversion and formatting
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static uint32_t GetUYVY(int16_t y1, int16_t y2, int16_t u, int16_t v);
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static uint16_t GetRGBA(int16_t y, int16_t u, int16_t v);
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/* tile line emitters */
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// Tile line emitters
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static void EmitYUVTileLine(CHle * hle, const int16_t *y, const int16_t *u, uint32_t address);
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static void EmitRGBATileLine(CHle * hle, const int16_t *y, const int16_t *u, uint32_t address);
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/* macroblocks operations */
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// Macroblocks operations
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static void decode_macroblock_ob(int16_t *macroblock, int32_t *y_dc, int32_t *u_dc, int32_t *v_dc, const int16_t *qtable);
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static void decode_macroblock_std(const subblock_transform_t transform_luma,
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const subblock_transform_t transform_chroma,
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@ -47,7 +39,7 @@ static void decode_macroblock_std(const subblock_transform_t transform_luma,
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static void EmitTilesMode0(CHle * hle, const tile_line_emitter_t emit_line, const int16_t *macroblock, uint32_t address);
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static void EmitTilesMode2(CHle * hle, const tile_line_emitter_t emit_line, const int16_t *macroblock, uint32_t address);
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/* subblocks operations */
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// Sub blocks operations
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static void TransposeSubBlock(int16_t *dst, const int16_t *src);
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static void ZigZagSubBlock(int16_t *dst, const int16_t *src);
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static void ReorderSubBlock(int16_t *dst, const int16_t *src, const unsigned int *table);
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@ -59,7 +51,7 @@ static void InverseDCTSubBlock(int16_t *dst, const int16_t *src);
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static void RescaleYSubBlock(int16_t *dst, const int16_t *src);
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static void RescaleUVSubBlock(int16_t *dst, const int16_t *src);
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/* transposed dequantization table */
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// Transposed dequantization table
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static const int16_t DEFAULT_QTABLE[SUBBLOCK_SIZE] = {
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16, 12, 14, 14, 18, 24, 49, 72,
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11, 12, 13, 17, 22, 35, 64, 92,
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@ -71,7 +63,7 @@ static const int16_t DEFAULT_QTABLE[SUBBLOCK_SIZE] = {
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61, 55, 56, 62, 77, 92, 101, 99
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};
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/* zig-zag indices */
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// Zig-zag indices
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static const unsigned int ZIGZAG_TABLE[SUBBLOCK_SIZE] = {
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0, 1, 5, 6, 14, 15, 27, 28,
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2, 4, 7, 13, 16, 26, 29, 42,
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@ -83,7 +75,7 @@ static const unsigned int ZIGZAG_TABLE[SUBBLOCK_SIZE] = {
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35, 36, 48, 49, 57, 58, 62, 63
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};
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/* transposition indices */
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// Transposition indices
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static const unsigned int TRANSPOSE_TABLE[SUBBLOCK_SIZE] = {
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0, 8, 16, 24, 32, 40, 48, 56,
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1, 9, 17, 25, 33, 41, 49, 57,
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@ -100,40 +92,37 @@ static const unsigned int TRANSPOSE_TABLE[SUBBLOCK_SIZE] = {
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static const float IDCT_C3 = 1.175875602f;
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static const float IDCT_C6 = 0.541196100f;
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static const float IDCT_K[10] = {
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0.765366865f, /* C2-C6 */
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-1.847759065f, /* -C2-C6 */
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-0.390180644f, /* C5-C3 */
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-1.961570561f, /* -C5-C3 */
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1.501321110f, /* C1+C3-C5-C7 */
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2.053119869f, /* C1+C3-C5+C7 */
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3.072711027f, /* C1+C3+C5-C7 */
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0.298631336f, /* -C1+C3+C5-C7 */
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-0.899976223f, /* C7-C3 */
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-2.562915448f /* -C1-C3 */
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0.765366865f, // C2-C6
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-1.847759065f, // -C2-C6
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-0.390180644f, // C5-C3
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-1.961570561f, // -C5-C3
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1.501321110f, // C1+C3-C5-C7
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2.053119869f, // C1+C3-C5+C7
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3.072711027f, // C1+C3+C5-C7
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0.298631336f, // -C1+C3+C5-C7
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-0.899976223f, // C7-C3
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-2.562915448f // -C1-C3
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};
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/* global functions */
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// Global functions
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// JPEG decoding microcode found in Japanese-exclusive version of Pokémon Stadium
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/***************************************************************************
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* JPEG decoding ucode found in Japanese exclusive version of Pokemon Stadium.
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**************************************************************************/
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void jpeg_decode_PS0(CHle * hle)
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{
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jpeg_decode_std(hle, "PS0", RescaleYSubBlock, RescaleUVSubBlock, EmitYUVTileLine);
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}
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/***************************************************************************
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* JPEG decoding ucode found in Ocarina of Time, Pokemon Stadium 1 and
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* Pokemon Stadium 2.
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**************************************************************************/
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// JPEG decoding microcode found in Ocarina of Time, Pokémon Stadium 1, and Pokémon Stadium 2
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void jpeg_decode_PS(CHle * hle)
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{
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jpeg_decode_std(hle, "PS", NULL, NULL, EmitRGBATileLine);
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}
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/***************************************************************************
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* JPEG decoding ucode found in Ogre Battle and Bottom of the 9th.
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**************************************************************************/
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// JPEG decoding microcode found in Ogre Battle and Bottom of the 9th
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void jpeg_decode_OB(CHle * hle)
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{
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int16_t qtable[SUBBLOCK_SIZE];
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@ -173,7 +162,8 @@ void jpeg_decode_OB(CHle * hle)
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}
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}
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/* local functions */
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// Local functions
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static void jpeg_decode_std(CHle * hle, const char *const version, const subblock_transform_t transform_luma, const subblock_transform_t transform_chroma, const tile_line_emitter_t emit_line)
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{
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int16_t qtables[3][SUBBLOCK_SIZE];
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@ -186,7 +176,7 @@ static void jpeg_decode_std(CHle * hle, const char *const version, const subbloc
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uint32_t qtableV_ptr;
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unsigned int subblock_count;
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unsigned int macroblock_size;
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/* macroblock contains at most 6 subblocks */
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// Macroblock contains at most 6 sub blocks
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int16_t macroblock[6 * SUBBLOCK_SIZE];
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uint32_t data_ptr;
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@ -375,7 +365,7 @@ static void decode_macroblock_ob(int16_t *macroblock, int32_t *y_dc, int32_t *u_
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for (sb = 0; sb < 6; ++sb) {
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int16_t tmp_sb[SUBBLOCK_SIZE];
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/* update DC */
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// Update DC
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int32_t dc = (int32_t)macroblock[0];
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switch (sb) {
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case 0:
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@ -462,7 +452,7 @@ static void ReorderSubBlock(int16_t *dst, const int16_t *src, const unsigned int
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{
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unsigned int i;
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/* source and destination sublocks cannot overlap */
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// Source and destination sub blocks cannot overlap
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assert(abs(dst - src) > SUBBLOCK_SIZE);
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for (i = 0; i < SUBBLOCK_SIZE; ++i)
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@ -498,12 +488,14 @@ static void RShiftSubBlock(int16_t *dst, const int16_t *src, unsigned int shift)
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dst[i] = src[i] >> shift;
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}
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/***************************************************************************
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* Fast 2D IDCT using separable formulation and normalization
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* Computations use single precision floats
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* Implementation based on Wikipedia :
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* http://fr.wikipedia.org/wiki/Transform%C3%A9e_en_cosinus_discr%C3%A8te
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**************************************************************************/
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/*
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TODO: find a better, more general resource for this
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Fast 2D IDCT using separable formulation and normalization
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Computations use single precision floats
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Implementation based on Wikipedia:
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https://fr.wikipedia.org/wiki/Transform%C3%A9e_en_cosinus_discr%C3%A8te
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*/
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static void InverseDCT1D(const float *const x, float *dst, unsigned int stride)
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{
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float e[4];
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@ -550,7 +542,7 @@ static void InverseDCTSubBlock(int16_t *dst, const int16_t *src)
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float block[SUBBLOCK_SIZE];
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unsigned int i, j;
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/* idct 1d on rows (+transposition) */
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// IDCT 1D on rows (+transposition)
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for (i = 0; i < 8; ++i)
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{
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for (j = 0; j < 8; ++j)
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InverseDCT1D(x, &block[i], 8);
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}
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/* idct 1d on columns (thanks to previous transposition) */
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// IDCT 1D on columns (thanks to previous transposition)
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for (i = 0; i < 8; ++i)
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{
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InverseDCT1D(&block[i * 8], x, 1);
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/* C4 = 1 normalization implies a division by 8 */
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// C4 = 1 normalization implies a division by 8
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for (j = 0; j < 8; ++j)
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{
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dst[i + j * 8] = (int16_t)x[j] >> 3;
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@ -589,4 +581,4 @@ static void RescaleUVSubBlock(int16_t *dst, const int16_t *src)
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{
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dst[i] = (((int)clamp_s12(src[i]) * 0xe00) >> 16) + 0x80;
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}
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}
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}
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