508 lines
15 KiB
C
508 lines
15 KiB
C
// Copyright (c) 2015 YamaArashi
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include "global.h"
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#include "gfx.h"
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#include "util.h"
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#define GET_GBA_PAL_RED(x) (((x) >> 0) & 0x1F)
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#define GET_GBA_PAL_GREEN(x) (((x) >> 5) & 0x1F)
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#define GET_GBA_PAL_BLUE(x) (((x) >> 10) & 0x1F)
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#define SET_GBA_PAL(r, g, b) (((b) << 10) | ((g) << 5) | (r))
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#define UPCONVERT_BIT_DEPTH(x) (((x) * 255) / 31)
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#define DOWNCONVERT_BIT_DEPTH(x) ((x) / 8)
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static void AdvanceMetatilePosition(int *subTileX, int *subTileY, int *metatileX, int *metatileY, int metatilesWide, int metatileWidth, int metatileHeight)
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{
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(*subTileX)++;
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if (*subTileX == metatileWidth) {
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*subTileX = 0;
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(*subTileY)++;
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if (*subTileY == metatileHeight) {
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*subTileY = 0;
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(*metatileX)++;
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if (*metatileX == metatilesWide) {
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*metatileX = 0;
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(*metatileY)++;
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}
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}
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}
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}
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static void ConvertFromTiles1Bpp(unsigned char *src, unsigned char *dest, int numTiles, int metatilesWide, int metatileWidth, int metatileHeight, bool invertColors)
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{
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int subTileX = 0;
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int subTileY = 0;
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int metatileX = 0;
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int metatileY = 0;
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int pitch = metatilesWide * metatileWidth;
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for (int i = 0; i < numTiles; i++) {
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for (int j = 0; j < 8; j++) {
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int destY = (metatileY * metatileHeight + subTileY) * 8 + j;
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int destX = metatileX * metatileWidth + subTileX;
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unsigned char srcPixelOctet = *src++;
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unsigned char *destPixelOctet = &dest[destY * pitch + destX];
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for (int k = 0; k < 8; k++) {
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*destPixelOctet <<= 1;
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*destPixelOctet |= (srcPixelOctet & 1) ^ invertColors;
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srcPixelOctet >>= 1;
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}
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}
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AdvanceMetatilePosition(&subTileX, &subTileY, &metatileX, &metatileY, metatilesWide, metatileWidth, metatileHeight);
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}
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}
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static void ConvertFromTiles4Bpp(unsigned char *src, unsigned char *dest, int numTiles, int metatilesWide, int metatileWidth, int metatileHeight, bool invertColors)
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{
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int subTileX = 0;
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int subTileY = 0;
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int metatileX = 0;
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int metatileY = 0;
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int pitch = (metatilesWide * metatileWidth) * 4;
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for (int i = 0; i < numTiles; i++) {
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for (int j = 0; j < 8; j++) {
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int destY = (metatileY * metatileHeight + subTileY) * 8 + j;
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for (int k = 0; k < 4; k++) {
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int destX = (metatileX * metatileWidth + subTileX) * 4 + k;
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unsigned char srcPixelPair = *src++;
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unsigned char leftPixel = srcPixelPair & 0xF;
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unsigned char rightPixel = srcPixelPair >> 4;
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if (invertColors) {
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leftPixel = 15 - leftPixel;
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rightPixel = 15 - rightPixel;
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}
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dest[destY * pitch + destX] = (leftPixel << 4) | rightPixel;
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}
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}
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AdvanceMetatilePosition(&subTileX, &subTileY, &metatileX, &metatileY, metatilesWide, metatileWidth, metatileHeight);
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}
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}
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static void ConvertFromTiles8Bpp(unsigned char *src, unsigned char *dest, int numTiles, int metatilesWide, int metatileWidth, int metatileHeight, bool invertColors)
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{
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int subTileX = 0;
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int subTileY = 0;
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int metatileX = 0;
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int metatileY = 0;
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int pitch = (metatilesWide * metatileWidth) * 8;
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for (int i = 0; i < numTiles; i++) {
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for (int j = 0; j < 8; j++) {
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int destY = (metatileY * metatileHeight + subTileY) * 8 + j;
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for (int k = 0; k < 8; k++) {
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int destX = (metatileX * metatileWidth + subTileX) * 8 + k;
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unsigned char srcPixel = *src++;
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if (invertColors)
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srcPixel = 255 - srcPixel;
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dest[destY * pitch + destX] = srcPixel;
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}
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}
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AdvanceMetatilePosition(&subTileX, &subTileY, &metatileX, &metatileY, metatilesWide, metatileWidth, metatileHeight);
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}
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}
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static void ConvertToTiles1Bpp(unsigned char *src, unsigned char *dest, int numTiles, int metatilesWide, int metatileWidth, int metatileHeight, bool invertColors)
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{
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int subTileX = 0;
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int subTileY = 0;
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int metatileX = 0;
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int metatileY = 0;
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int pitch = metatilesWide * metatileWidth;
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for (int i = 0; i < numTiles; i++) {
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for (int j = 0; j < 8; j++) {
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int srcY = (metatileY * metatileHeight + subTileY) * 8 + j;
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int srcX = metatileX * metatileWidth + subTileX;
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unsigned char srcPixelOctet = src[srcY * pitch + srcX];
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unsigned char *destPixelOctet = dest++;
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for (int k = 0; k < 8; k++) {
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*destPixelOctet <<= 1;
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*destPixelOctet |= (srcPixelOctet & 1) ^ invertColors;
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srcPixelOctet >>= 1;
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}
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}
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AdvanceMetatilePosition(&subTileX, &subTileY, &metatileX, &metatileY, metatilesWide, metatileWidth, metatileHeight);
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}
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}
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static void ConvertToTiles4Bpp(unsigned char *src, unsigned char *dest, int numTiles, int metatilesWide, int metatileWidth, int metatileHeight, bool invertColors)
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{
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int subTileX = 0;
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int subTileY = 0;
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int metatileX = 0;
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int metatileY = 0;
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int pitch = (metatilesWide * metatileWidth) * 4;
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for (int i = 0; i < numTiles; i++) {
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for (int j = 0; j < 8; j++) {
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int srcY = (metatileY * metatileHeight + subTileY) * 8 + j;
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for (int k = 0; k < 4; k++) {
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int srcX = (metatileX * metatileWidth + subTileX) * 4 + k;
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unsigned char srcPixelPair = src[srcY * pitch + srcX];
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unsigned char leftPixel = srcPixelPair >> 4;
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unsigned char rightPixel = srcPixelPair & 0xF;
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if (invertColors) {
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leftPixel = 15 - leftPixel;
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rightPixel = 15 - rightPixel;
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}
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*dest++ = (rightPixel << 4) | leftPixel;
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}
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}
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AdvanceMetatilePosition(&subTileX, &subTileY, &metatileX, &metatileY, metatilesWide, metatileWidth, metatileHeight);
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}
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}
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static void ConvertToTiles8Bpp(unsigned char *src, unsigned char *dest, int numTiles, int metatilesWide, int metatileWidth, int metatileHeight, bool invertColors)
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{
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int subTileX = 0;
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int subTileY = 0;
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int metatileX = 0;
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int metatileY = 0;
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int pitch = (metatilesWide * metatileWidth) * 8;
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for (int i = 0; i < numTiles; i++) {
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for (int j = 0; j < 8; j++) {
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int srcY = (metatileY * metatileHeight + subTileY) * 8 + j;
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for (int k = 0; k < 8; k++) {
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int srcX = (metatileX * metatileWidth + subTileX) * 8 + k;
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unsigned char srcPixel = src[srcY * pitch + srcX];
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if (invertColors)
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srcPixel = 255 - srcPixel;
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*dest++ = srcPixel;
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}
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}
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AdvanceMetatilePosition(&subTileX, &subTileY, &metatileX, &metatileY, metatilesWide, metatileWidth, metatileHeight);
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}
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}
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static void DecodeAffineTilemap(unsigned char *input, unsigned char *output, unsigned char *tilemap, int tileSize, int numTiles)
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{
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for (int i = 0; i < numTiles; i++)
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{
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memcpy(&output[i * tileSize], &input[tilemap[i] * tileSize], tileSize);
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}
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}
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#define REVERSE_BIT_ORDER(x) ({ \
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((((x) >> 7) & 1) << 0) \
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| ((((x) >> 6) & 1) << 1) \
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| ((((x) >> 5) & 1) << 2) \
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| ((((x) >> 4) & 1) << 3) \
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| ((((x) >> 3) & 1) << 4) \
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| ((((x) >> 2) & 1) << 5) \
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| ((((x) >> 1) & 1) << 6) \
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| ((((x) >> 0) & 1) << 7); \
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})
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#define SWAP_BYTES(a, b) ({ \
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unsigned char tmp = *(a); \
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*(a) = *(b); \
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*(b) = tmp; \
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})
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#define NSWAP(x) ({ (((x) >> 4) & 0xF) | (((x) << 4) & 0xF0); })
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#define SWAP_NYBBLES(a, b) ({ \
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unsigned char tmp = NSWAP(*(a)); \
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*(a) = NSWAP(*(b)); \
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*(b) = tmp; \
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})
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static void VflipTile(unsigned char * tile, int bitDepth)
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{
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int i;
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switch (bitDepth)
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{
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case 1:
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SWAP_BYTES(&tile[0], &tile[7]);
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SWAP_BYTES(&tile[1], &tile[6]);
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SWAP_BYTES(&tile[2], &tile[5]);
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SWAP_BYTES(&tile[3], &tile[4]);
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break;
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case 4:
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for (i = 0; i < 4; i++)
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{
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SWAP_BYTES(&tile[i + 0], &tile[i + 28]);
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SWAP_BYTES(&tile[i + 4], &tile[i + 24]);
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SWAP_BYTES(&tile[i + 8], &tile[i + 20]);
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SWAP_BYTES(&tile[i + 12], &tile[i + 16]);
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}
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break;
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case 8:
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for (i = 0; i < 8; i++)
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{
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SWAP_BYTES(&tile[i + 0], &tile[i + 56]);
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SWAP_BYTES(&tile[i + 8], &tile[i + 48]);
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SWAP_BYTES(&tile[i + 16], &tile[i + 40]);
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SWAP_BYTES(&tile[i + 24], &tile[i + 32]);
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}
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break;
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}
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}
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static void HflipTile(unsigned char * tile, int bitDepth)
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{
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int i;
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switch (bitDepth)
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{
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case 1:
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for (i = 0; i < 8; i++)
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tile[i] = REVERSE_BIT_ORDER(tile[i]);
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break;
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case 4:
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for (i = 0; i < 8; i++)
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{
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SWAP_NYBBLES(&tile[4 * i + 0], &tile[4 * i + 3]);
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SWAP_NYBBLES(&tile[4 * i + 1], &tile[4 * i + 2]);
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}
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break;
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case 8:
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for (i = 0; i < 8; i++)
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{
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SWAP_BYTES(&tile[8 * i + 0], &tile[8 * i + 7]);
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SWAP_BYTES(&tile[8 * i + 1], &tile[8 * i + 6]);
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SWAP_BYTES(&tile[8 * i + 2], &tile[8 * i + 5]);
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SWAP_BYTES(&tile[8 * i + 3], &tile[8 * i + 4]);
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}
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break;
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}
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}
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static void DecodeNonAffineTilemap(unsigned char *input, unsigned char *output, struct NonAffineTile *tilemap, int tileSize, int outTileSize, int bitDepth, int numTiles)
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{
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unsigned char * in_tile;
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unsigned char * out_tile = output;
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int effectiveBitDepth = tileSize == outTileSize ? bitDepth : 8;
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for (int i = 0; i < numTiles; i++)
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{
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in_tile = &input[tilemap[i].index * tileSize];
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if (tileSize == outTileSize)
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memcpy(out_tile, in_tile, tileSize);
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else
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{
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for (int j = 0; j < 64; j++)
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{
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int shift = (j & 1) * 4;
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out_tile[j] = (in_tile[j / 2] & (0xF << shift)) >> shift;
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}
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}
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if (tilemap[i].hflip)
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HflipTile(out_tile, effectiveBitDepth);
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if (tilemap[i].vflip)
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VflipTile(out_tile, effectiveBitDepth);
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if (bitDepth == 4 && effectiveBitDepth == 8)
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{
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for (int j = 0; j < 64; j++)
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{
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out_tile[j] &= 0xF;
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out_tile[j] |= (15 - tilemap[i].palno) << 4;
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}
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}
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out_tile += outTileSize;
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}
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}
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static unsigned char *DecodeTilemap(unsigned char *tiles, struct Tilemap *tilemap, int *numTiles_p, bool isAffine, int tileSize, int outTileSize, int bitDepth)
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{
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int mapTileSize = isAffine ? 1 : 2;
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int numTiles = tilemap->size / mapTileSize;
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unsigned char *decoded = calloc(numTiles, outTileSize);
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if (isAffine)
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DecodeAffineTilemap(tiles, decoded, tilemap->data.affine, tileSize, numTiles);
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else
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DecodeNonAffineTilemap(tiles, decoded, tilemap->data.non_affine, tileSize, outTileSize, bitDepth, numTiles);
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free(tiles);
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*numTiles_p = numTiles;
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return decoded;
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}
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void ReadImage(char *path, int tilesWidth, int bitDepth, int metatileWidth, int metatileHeight, struct Image *image, bool invertColors)
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{
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int tileSize = bitDepth * 8;
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int fileSize;
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unsigned char *buffer = ReadWholeFile(path, &fileSize);
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int numTiles = fileSize / tileSize;
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if (image->tilemap.data.affine != NULL)
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{
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int outTileSize = (bitDepth == 4 && image->palette.numColors > 16) ? 64 : tileSize;
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buffer = DecodeTilemap(buffer, &image->tilemap, &numTiles, image->isAffine, tileSize, outTileSize, bitDepth);
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if (outTileSize == 64)
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{
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tileSize = 64;
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image->bitDepth = bitDepth = 8;
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}
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}
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int tilesHeight = (numTiles + tilesWidth - 1) / tilesWidth;
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if (tilesWidth % metatileWidth != 0)
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FATAL_ERROR("The width in tiles (%d) isn't a multiple of the specified metatile width (%d)", tilesWidth, metatileWidth);
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if (tilesHeight % metatileHeight != 0)
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FATAL_ERROR("The height in tiles (%d) isn't a multiple of the specified metatile height (%d)", tilesHeight, metatileHeight);
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image->width = tilesWidth * 8;
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image->height = tilesHeight * 8;
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image->bitDepth = bitDepth;
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image->pixels = calloc(tilesWidth * tilesHeight, tileSize);
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if (image->pixels == NULL)
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FATAL_ERROR("Failed to allocate memory for pixels.\n");
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int metatilesWide = tilesWidth / metatileWidth;
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switch (bitDepth) {
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case 1:
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ConvertFromTiles1Bpp(buffer, image->pixels, numTiles, metatilesWide, metatileWidth, metatileHeight, invertColors);
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break;
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case 4:
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ConvertFromTiles4Bpp(buffer, image->pixels, numTiles, metatilesWide, metatileWidth, metatileHeight, invertColors);
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break;
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case 8:
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ConvertFromTiles8Bpp(buffer, image->pixels, numTiles, metatilesWide, metatileWidth, metatileHeight, invertColors);
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break;
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}
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free(buffer);
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}
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void WriteImage(char *path, int numTiles, int bitDepth, int metatileWidth, int metatileHeight, struct Image *image, bool invertColors)
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{
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int tileSize = bitDepth * 8;
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if (image->width % 8 != 0)
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FATAL_ERROR("The width in pixels (%d) isn't a multiple of 8.\n", image->width);
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if (image->height % 8 != 0)
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FATAL_ERROR("The height in pixels (%d) isn't a multiple of 8.\n", image->height);
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int tilesWidth = image->width / 8;
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int tilesHeight = image->height / 8;
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if (tilesWidth % metatileWidth != 0)
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FATAL_ERROR("The width in tiles (%d) isn't a multiple of the specified metatile width (%d)", tilesWidth, metatileWidth);
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if (tilesHeight % metatileHeight != 0)
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FATAL_ERROR("The height in tiles (%d) isn't a multiple of the specified metatile height (%d)", tilesHeight, metatileHeight);
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int maxNumTiles = tilesWidth * tilesHeight;
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if (numTiles == 0)
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numTiles = maxNumTiles;
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else if (numTiles > maxNumTiles)
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FATAL_ERROR("The specified number of tiles (%d) is greater than the maximum possible value (%d).\n", numTiles, maxNumTiles);
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int bufferSize = numTiles * tileSize;
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unsigned char *buffer = malloc(bufferSize);
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if (buffer == NULL)
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FATAL_ERROR("Failed to allocate memory for pixels.\n");
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int metatilesWide = tilesWidth / metatileWidth;
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switch (bitDepth) {
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case 1:
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ConvertToTiles1Bpp(image->pixels, buffer, numTiles, metatilesWide, metatileWidth, metatileHeight, invertColors);
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break;
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case 4:
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ConvertToTiles4Bpp(image->pixels, buffer, numTiles, metatilesWide, metatileWidth, metatileHeight, invertColors);
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break;
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case 8:
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ConvertToTiles8Bpp(image->pixels, buffer, numTiles, metatilesWide, metatileWidth, metatileHeight, invertColors);
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break;
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}
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WriteWholeFile(path, buffer, bufferSize);
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free(buffer);
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}
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void FreeImage(struct Image *image)
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{
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if (image->tilemap.data.affine != NULL)
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{
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free(image->tilemap.data.affine);
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image->tilemap.data.affine = NULL;
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}
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free(image->pixels);
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image->pixels = NULL;
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}
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void ReadGbaPalette(char *path, struct Palette *palette)
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{
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int fileSize;
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unsigned char *data = ReadWholeFile(path, &fileSize);
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if (fileSize % 2 != 0)
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FATAL_ERROR("The file size (%d) is not a multiple of 2.\n", fileSize);
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palette->numColors = fileSize / 2;
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for (int i = 0; i < palette->numColors; i++) {
|
|
uint16_t paletteEntry = (data[i * 2 + 1] << 8) | data[i * 2];
|
|
palette->colors[i].red = UPCONVERT_BIT_DEPTH(GET_GBA_PAL_RED(paletteEntry));
|
|
palette->colors[i].green = UPCONVERT_BIT_DEPTH(GET_GBA_PAL_GREEN(paletteEntry));
|
|
palette->colors[i].blue = UPCONVERT_BIT_DEPTH(GET_GBA_PAL_BLUE(paletteEntry));
|
|
}
|
|
// png can only accept 16 or 256 colors, so fill the remainder with black
|
|
if (palette->numColors > 16)
|
|
{
|
|
memset(&palette->colors[palette->numColors], 0, (256 - palette->numColors) * sizeof(struct Color));
|
|
palette->numColors = 256;
|
|
}
|
|
|
|
free(data);
|
|
}
|
|
|
|
void WriteGbaPalette(char *path, struct Palette *palette)
|
|
{
|
|
FILE *fp = fopen(path, "wb");
|
|
|
|
if (fp == NULL)
|
|
FATAL_ERROR("Failed to open \"%s\" for writing.\n", path);
|
|
|
|
for (int i = 0; i < palette->numColors; i++) {
|
|
unsigned char red = DOWNCONVERT_BIT_DEPTH(palette->colors[i].red);
|
|
unsigned char green = DOWNCONVERT_BIT_DEPTH(palette->colors[i].green);
|
|
unsigned char blue = DOWNCONVERT_BIT_DEPTH(palette->colors[i].blue);
|
|
|
|
uint16_t paletteEntry = SET_GBA_PAL(red, green, blue);
|
|
|
|
fputc(paletteEntry & 0xFF, fp);
|
|
fputc(paletteEntry >> 8, fp);
|
|
}
|
|
|
|
fclose(fp);
|
|
}
|