tumbledemerald-legacy/tools/gbagfx/gfx.c

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2022-05-19 19:14:13 +02:00
// Copyright (c) 2015 YamaArashi
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include "global.h"
#include "gfx.h"
#include "util.h"
#define GET_GBA_PAL_RED(x) (((x) >> 0) & 0x1F)
#define GET_GBA_PAL_GREEN(x) (((x) >> 5) & 0x1F)
#define GET_GBA_PAL_BLUE(x) (((x) >> 10) & 0x1F)
#define SET_GBA_PAL(r, g, b) (((b) << 10) | ((g) << 5) | (r))
#define UPCONVERT_BIT_DEPTH(x) (((x) * 255) / 31)
#define DOWNCONVERT_BIT_DEPTH(x) ((x) / 8)
static void AdvanceMetatilePosition(int *subTileX, int *subTileY, int *metatileX, int *metatileY, int metatilesWide, int metatileWidth, int metatileHeight)
{
(*subTileX)++;
if (*subTileX == metatileWidth) {
*subTileX = 0;
(*subTileY)++;
if (*subTileY == metatileHeight) {
*subTileY = 0;
(*metatileX)++;
if (*metatileX == metatilesWide) {
*metatileX = 0;
(*metatileY)++;
}
}
}
}
static void ConvertFromTiles1Bpp(unsigned char *src, unsigned char *dest, int numTiles, int metatilesWide, int metatileWidth, int metatileHeight, bool invertColors)
{
int subTileX = 0;
int subTileY = 0;
int metatileX = 0;
int metatileY = 0;
int pitch = metatilesWide * metatileWidth;
for (int i = 0; i < numTiles; i++) {
for (int j = 0; j < 8; j++) {
int destY = (metatileY * metatileHeight + subTileY) * 8 + j;
int destX = metatileX * metatileWidth + subTileX;
unsigned char srcPixelOctet = *src++;
unsigned char *destPixelOctet = &dest[destY * pitch + destX];
for (int k = 0; k < 8; k++) {
*destPixelOctet <<= 1;
*destPixelOctet |= (srcPixelOctet & 1) ^ invertColors;
srcPixelOctet >>= 1;
}
}
AdvanceMetatilePosition(&subTileX, &subTileY, &metatileX, &metatileY, metatilesWide, metatileWidth, metatileHeight);
}
}
static void ConvertFromTiles4Bpp(unsigned char *src, unsigned char *dest, int numTiles, int metatilesWide, int metatileWidth, int metatileHeight, bool invertColors)
{
int subTileX = 0;
int subTileY = 0;
int metatileX = 0;
int metatileY = 0;
int pitch = (metatilesWide * metatileWidth) * 4;
for (int i = 0; i < numTiles; i++) {
for (int j = 0; j < 8; j++) {
int destY = (metatileY * metatileHeight + subTileY) * 8 + j;
for (int k = 0; k < 4; k++) {
int destX = (metatileX * metatileWidth + subTileX) * 4 + k;
unsigned char srcPixelPair = *src++;
unsigned char leftPixel = srcPixelPair & 0xF;
unsigned char rightPixel = srcPixelPair >> 4;
if (invertColors) {
leftPixel = 15 - leftPixel;
rightPixel = 15 - rightPixel;
}
dest[destY * pitch + destX] = (leftPixel << 4) | rightPixel;
}
}
AdvanceMetatilePosition(&subTileX, &subTileY, &metatileX, &metatileY, metatilesWide, metatileWidth, metatileHeight);
}
}
static void ConvertFromTiles8Bpp(unsigned char *src, unsigned char *dest, int numTiles, int metatilesWide, int metatileWidth, int metatileHeight, bool invertColors)
{
int subTileX = 0;
int subTileY = 0;
int metatileX = 0;
int metatileY = 0;
int pitch = (metatilesWide * metatileWidth) * 8;
for (int i = 0; i < numTiles; i++) {
for (int j = 0; j < 8; j++) {
int destY = (metatileY * metatileHeight + subTileY) * 8 + j;
for (int k = 0; k < 8; k++) {
int destX = (metatileX * metatileWidth + subTileX) * 8 + k;
unsigned char srcPixel = *src++;
if (invertColors)
srcPixel = 255 - srcPixel;
dest[destY * pitch + destX] = srcPixel;
}
}
AdvanceMetatilePosition(&subTileX, &subTileY, &metatileX, &metatileY, metatilesWide, metatileWidth, metatileHeight);
}
}
static void ConvertToTiles1Bpp(unsigned char *src, unsigned char *dest, int numTiles, int metatilesWide, int metatileWidth, int metatileHeight, bool invertColors)
{
int subTileX = 0;
int subTileY = 0;
int metatileX = 0;
int metatileY = 0;
int pitch = metatilesWide * metatileWidth;
for (int i = 0; i < numTiles; i++) {
for (int j = 0; j < 8; j++) {
int srcY = (metatileY * metatileHeight + subTileY) * 8 + j;
int srcX = metatileX * metatileWidth + subTileX;
unsigned char srcPixelOctet = src[srcY * pitch + srcX];
unsigned char *destPixelOctet = dest++;
for (int k = 0; k < 8; k++) {
*destPixelOctet <<= 1;
*destPixelOctet |= (srcPixelOctet & 1) ^ invertColors;
srcPixelOctet >>= 1;
}
}
AdvanceMetatilePosition(&subTileX, &subTileY, &metatileX, &metatileY, metatilesWide, metatileWidth, metatileHeight);
}
}
static void ConvertToTiles4Bpp(unsigned char *src, unsigned char *dest, int numTiles, int metatilesWide, int metatileWidth, int metatileHeight, bool invertColors)
{
int subTileX = 0;
int subTileY = 0;
int metatileX = 0;
int metatileY = 0;
int pitch = (metatilesWide * metatileWidth) * 4;
for (int i = 0; i < numTiles; i++) {
for (int j = 0; j < 8; j++) {
int srcY = (metatileY * metatileHeight + subTileY) * 8 + j;
for (int k = 0; k < 4; k++) {
int srcX = (metatileX * metatileWidth + subTileX) * 4 + k;
unsigned char srcPixelPair = src[srcY * pitch + srcX];
unsigned char leftPixel = srcPixelPair >> 4;
unsigned char rightPixel = srcPixelPair & 0xF;
if (invertColors) {
leftPixel = 15 - leftPixel;
rightPixel = 15 - rightPixel;
}
*dest++ = (rightPixel << 4) | leftPixel;
}
}
AdvanceMetatilePosition(&subTileX, &subTileY, &metatileX, &metatileY, metatilesWide, metatileWidth, metatileHeight);
}
}
static void ConvertToTiles8Bpp(unsigned char *src, unsigned char *dest, int numTiles, int metatilesWide, int metatileWidth, int metatileHeight, bool invertColors)
{
int subTileX = 0;
int subTileY = 0;
int metatileX = 0;
int metatileY = 0;
int pitch = (metatilesWide * metatileWidth) * 8;
for (int i = 0; i < numTiles; i++) {
for (int j = 0; j < 8; j++) {
int srcY = (metatileY * metatileHeight + subTileY) * 8 + j;
for (int k = 0; k < 8; k++) {
int srcX = (metatileX * metatileWidth + subTileX) * 8 + k;
unsigned char srcPixel = src[srcY * pitch + srcX];
if (invertColors)
srcPixel = 255 - srcPixel;
*dest++ = srcPixel;
}
}
AdvanceMetatilePosition(&subTileX, &subTileY, &metatileX, &metatileY, metatilesWide, metatileWidth, metatileHeight);
}
}
static void DecodeAffineTilemap(unsigned char *input, unsigned char *output, unsigned char *tilemap, int tileSize, int numTiles)
{
for (int i = 0; i < numTiles; i++)
{
memcpy(&output[i * tileSize], &input[tilemap[i] * tileSize], tileSize);
}
}
#define REVERSE_BIT_ORDER(x) ({ \
((((x) >> 7) & 1) << 0) \
| ((((x) >> 6) & 1) << 1) \
| ((((x) >> 5) & 1) << 2) \
| ((((x) >> 4) & 1) << 3) \
| ((((x) >> 3) & 1) << 4) \
| ((((x) >> 2) & 1) << 5) \
| ((((x) >> 1) & 1) << 6) \
| ((((x) >> 0) & 1) << 7); \
})
#define SWAP_BYTES(a, b) ({ \
unsigned char tmp = *(a); \
*(a) = *(b); \
*(b) = tmp; \
})
#define NSWAP(x) ({ (((x) >> 4) & 0xF) | (((x) << 4) & 0xF0); })
#define SWAP_NYBBLES(a, b) ({ \
unsigned char tmp = NSWAP(*(a)); \
*(a) = NSWAP(*(b)); \
*(b) = tmp; \
})
static void VflipTile(unsigned char * tile, int bitDepth)
{
int i;
switch (bitDepth)
{
case 1:
SWAP_BYTES(&tile[0], &tile[7]);
SWAP_BYTES(&tile[1], &tile[6]);
SWAP_BYTES(&tile[2], &tile[5]);
SWAP_BYTES(&tile[3], &tile[4]);
break;
case 4:
for (i = 0; i < 4; i++)
{
SWAP_BYTES(&tile[i + 0], &tile[i + 28]);
SWAP_BYTES(&tile[i + 4], &tile[i + 24]);
SWAP_BYTES(&tile[i + 8], &tile[i + 20]);
SWAP_BYTES(&tile[i + 12], &tile[i + 16]);
}
break;
case 8:
for (i = 0; i < 8; i++)
{
SWAP_BYTES(&tile[i + 0], &tile[i + 56]);
SWAP_BYTES(&tile[i + 8], &tile[i + 48]);
SWAP_BYTES(&tile[i + 16], &tile[i + 40]);
SWAP_BYTES(&tile[i + 24], &tile[i + 32]);
}
break;
}
}
static void HflipTile(unsigned char * tile, int bitDepth)
{
int i;
switch (bitDepth)
{
case 1:
for (i = 0; i < 8; i++)
tile[i] = REVERSE_BIT_ORDER(tile[i]);
break;
case 4:
for (i = 0; i < 8; i++)
{
SWAP_NYBBLES(&tile[4 * i + 0], &tile[4 * i + 3]);
SWAP_NYBBLES(&tile[4 * i + 1], &tile[4 * i + 2]);
}
break;
case 8:
for (i = 0; i < 8; i++)
{
SWAP_BYTES(&tile[8 * i + 0], &tile[8 * i + 7]);
SWAP_BYTES(&tile[8 * i + 1], &tile[8 * i + 6]);
SWAP_BYTES(&tile[8 * i + 2], &tile[8 * i + 5]);
SWAP_BYTES(&tile[8 * i + 3], &tile[8 * i + 4]);
}
break;
}
}
static void DecodeNonAffineTilemap(unsigned char *input, unsigned char *output, struct NonAffineTile *tilemap, int tileSize, int outTileSize, int bitDepth, int numTiles)
{
unsigned char * in_tile;
unsigned char * out_tile = output;
int effectiveBitDepth = tileSize == outTileSize ? bitDepth : 8;
for (int i = 0; i < numTiles; i++)
{
in_tile = &input[tilemap[i].index * tileSize];
if (tileSize == outTileSize)
memcpy(out_tile, in_tile, tileSize);
else
{
for (int j = 0; j < 64; j++)
{
int shift = (j & 1) * 4;
out_tile[j] = (in_tile[j / 2] & (0xF << shift)) >> shift;
}
}
if (tilemap[i].hflip)
HflipTile(out_tile, effectiveBitDepth);
if (tilemap[i].vflip)
VflipTile(out_tile, effectiveBitDepth);
if (bitDepth == 4 && effectiveBitDepth == 8)
{
for (int j = 0; j < 64; j++)
{
out_tile[j] &= 0xF;
out_tile[j] |= (15 - tilemap[i].palno) << 4;
}
}
out_tile += outTileSize;
}
}
static unsigned char *DecodeTilemap(unsigned char *tiles, struct Tilemap *tilemap, int *numTiles_p, bool isAffine, int tileSize, int outTileSize, int bitDepth)
{
int mapTileSize = isAffine ? 1 : 2;
int numTiles = tilemap->size / mapTileSize;
unsigned char *decoded = calloc(numTiles, outTileSize);
if (isAffine)
DecodeAffineTilemap(tiles, decoded, tilemap->data.affine, tileSize, numTiles);
else
DecodeNonAffineTilemap(tiles, decoded, tilemap->data.non_affine, tileSize, outTileSize, bitDepth, numTiles);
free(tiles);
*numTiles_p = numTiles;
return decoded;
}
void ReadImage(char *path, int tilesWidth, int bitDepth, int metatileWidth, int metatileHeight, struct Image *image, bool invertColors)
{
int tileSize = bitDepth * 8;
int fileSize;
unsigned char *buffer = ReadWholeFile(path, &fileSize);
int numTiles = fileSize / tileSize;
if (image->tilemap.data.affine != NULL)
{
int outTileSize = (bitDepth == 4 && image->palette.numColors > 16) ? 64 : tileSize;
buffer = DecodeTilemap(buffer, &image->tilemap, &numTiles, image->isAffine, tileSize, outTileSize, bitDepth);
if (outTileSize == 64)
{
tileSize = 64;
image->bitDepth = bitDepth = 8;
}
}
int tilesHeight = (numTiles + tilesWidth - 1) / tilesWidth;
if (tilesWidth % metatileWidth != 0)
FATAL_ERROR("The width in tiles (%d) isn't a multiple of the specified metatile width (%d)", tilesWidth, metatileWidth);
if (tilesHeight % metatileHeight != 0)
FATAL_ERROR("The height in tiles (%d) isn't a multiple of the specified metatile height (%d)", tilesHeight, metatileHeight);
image->width = tilesWidth * 8;
image->height = tilesHeight * 8;
image->bitDepth = bitDepth;
image->pixels = calloc(tilesWidth * tilesHeight, tileSize);
if (image->pixels == NULL)
FATAL_ERROR("Failed to allocate memory for pixels.\n");
int metatilesWide = tilesWidth / metatileWidth;
switch (bitDepth) {
case 1:
ConvertFromTiles1Bpp(buffer, image->pixels, numTiles, metatilesWide, metatileWidth, metatileHeight, invertColors);
break;
case 4:
ConvertFromTiles4Bpp(buffer, image->pixels, numTiles, metatilesWide, metatileWidth, metatileHeight, invertColors);
break;
case 8:
ConvertFromTiles8Bpp(buffer, image->pixels, numTiles, metatilesWide, metatileWidth, metatileHeight, invertColors);
break;
}
free(buffer);
}
void WriteImage(char *path, int numTiles, int bitDepth, int metatileWidth, int metatileHeight, struct Image *image, bool invertColors)
{
int tileSize = bitDepth * 8;
if (image->width % 8 != 0)
FATAL_ERROR("The width in pixels (%d) isn't a multiple of 8.\n", image->width);
if (image->height % 8 != 0)
FATAL_ERROR("The height in pixels (%d) isn't a multiple of 8.\n", image->height);
int tilesWidth = image->width / 8;
int tilesHeight = image->height / 8;
if (tilesWidth % metatileWidth != 0)
FATAL_ERROR("The width in tiles (%d) isn't a multiple of the specified metatile width (%d)", tilesWidth, metatileWidth);
if (tilesHeight % metatileHeight != 0)
FATAL_ERROR("The height in tiles (%d) isn't a multiple of the specified metatile height (%d)", tilesHeight, metatileHeight);
int maxNumTiles = tilesWidth * tilesHeight;
if (numTiles == 0)
numTiles = maxNumTiles;
else if (numTiles > maxNumTiles)
FATAL_ERROR("The specified number of tiles (%d) is greater than the maximum possible value (%d).\n", numTiles, maxNumTiles);
int bufferSize = numTiles * tileSize;
unsigned char *buffer = malloc(bufferSize);
if (buffer == NULL)
FATAL_ERROR("Failed to allocate memory for pixels.\n");
int metatilesWide = tilesWidth / metatileWidth;
switch (bitDepth) {
case 1:
ConvertToTiles1Bpp(image->pixels, buffer, numTiles, metatilesWide, metatileWidth, metatileHeight, invertColors);
break;
case 4:
ConvertToTiles4Bpp(image->pixels, buffer, numTiles, metatilesWide, metatileWidth, metatileHeight, invertColors);
break;
case 8:
ConvertToTiles8Bpp(image->pixels, buffer, numTiles, metatilesWide, metatileWidth, metatileHeight, invertColors);
break;
}
WriteWholeFile(path, buffer, bufferSize);
free(buffer);
}
void FreeImage(struct Image *image)
{
if (image->tilemap.data.affine != NULL)
{
free(image->tilemap.data.affine);
image->tilemap.data.affine = NULL;
}
free(image->pixels);
image->pixels = NULL;
}
void ReadGbaPalette(char *path, struct Palette *palette)
{
int fileSize;
unsigned char *data = ReadWholeFile(path, &fileSize);
if (fileSize % 2 != 0)
FATAL_ERROR("The file size (%d) is not a multiple of 2.\n", fileSize);
palette->numColors = fileSize / 2;
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);
}