kichikuou_system3-sdl2/src/sys/ags_vsp2l.cpp

/*
	ALICE SOFT SYSTEM 1 for Win32

	[ AGS - vsp2l loader ]
*/

#include "ags.h"
#include <string.h>

CG AGS::load_vsp2l(const std::vector<uint8_t>& data, int transparent)
{
	// ヘッダ取得
	int sx = data[0] | (data[1] << 8);
	int sy = data[2] | (data[3] << 8);
	int ex = data[4] | (data[5] << 8);
	int ey = data[6] | (data[7] << 8);
	int width = ex - sx;
	int height = ey - sy;
	uint8 base = 0;//(data[9] & 0x0f) << 4;

	// Jコマンドの処理
	if(set_cg_dest) {
		sx = cg_dest_x >> 3;
		sy = cg_dest_y;
		ex = sx + width;
		ey = sy + height;
		set_cg_dest = false;
	}

	// Zコマンドの処理
	if(palette_bank != -1) {
		base = (palette_bank & 0x0f) << 4;
	}

	// パレット取得
	const SDL_Color colors[8] = {
		{0x00, 0x00, 0x00, 0xff},
		{0x00, 0x00, 0xff, 0xff},
		{0xff, 0x00, 0x00, 0xff},
		{0xff, 0x00, 0xff, 0xff},
		{0x00, 0xff, 0x00, 0xff},
		{0x00, 0xff, 0xff, 0xff},
		{0xff, 0xff, 0x00, 0xff},
		{0xff, 0xff, 0xff, 0xff}
	};
	SDL_SetPaletteColors(screen_palette, colors, base, 8);

	// VSP2L展開
	SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormat(0, width * 8, height * 2, 8, SDL_PIXELFORMAT_INDEX8);
	if (transparent >= 0) {
		SDL_SetColorKey(surface, SDL_TRUE, transparent | base);
	}
	uint8 cgdata[3][2][200], mask = 0;
	int p = 0x1a;
	memset(cgdata, 0, sizeof(cgdata));

	for(int x = 0; x < width; x++) {
		for(int pl = 0;  pl < 3; pl++) {
			int y = 0;
			while(y < height) {
				uint8 d1 = data[p++];
				if(d1 == 0) {
					int length = data[p++] + 1;
					for(int i = 0; i < length; i++) {
						cgdata[pl][0][y] = cgdata[pl][1][y];
						y++;
					}
				} else if(d1 == 1) {
					int length = data[p++] + 1;
					uint8 d2 = data[p++];
					for(int i = 0; i < length; i++) {
						cgdata[pl][0][y++] = d2;
					}
				} else if(d1 == 2) {
					int length = data[p++] + 1;
					uint8 d2 = data[p++];
					uint8 d3 = data[p++];
					for(int i = 0; i < length; i++) {
						cgdata[pl][0][y++] = d2;
						cgdata[pl][0][y++] = d3;
					}
				} else if(d1 == 3) {
					int length = data[p++] + 1;
					for(int i = 0; i < length; i++) {
						cgdata[pl][0][y] = cgdata[0][0][y] ^ mask;
						y++;
					}
					mask = 0;
				} else if(d1 == 4) {
					int length = data[p++] + 1;
					for(int i = 0; i < length; i++) {
						cgdata[pl][0][y] = cgdata[1][0][y] ^ mask;
						y++;
					}
					mask = 0;
				} else if(d1 == 5) {
					int length = data[p++] + 1;
					for(int i = 0; i < length; i++) {
						cgdata[pl][0][y] = cgdata[2][0][y] ^ mask;
						y++;
					}
					mask = 0;
				} else if(d1 == 6) {
					mask = 0xff;
				} else if(d1 == 7) {
					cgdata[pl][0][y++] = data[p++];
				} else {
					cgdata[pl][0][y++] = d1;
				}
			}
		}

		// Transfer to the surface
		for (int y = 0; y < height; y++) {
			uint8 b0, b1, b2, c[8];
			b0 = cgdata[0][1][y] = cgdata[0][0][y];
			b1 = cgdata[1][1][y] = cgdata[1][0][y];
			b2 = cgdata[2][1][y] = cgdata[2][0][y];
			c[0] = ((b0 >> 7) & 1) | ((b1 >> 6) & 2) | ((b2 >> 5) & 4);
			c[1] = ((b0 >> 6) & 1) | ((b1 >> 5) & 2) | ((b2 >> 4) & 4);
			c[2] = ((b0 >> 5) & 1) | ((b1 >> 4) & 2) | ((b2 >> 3) & 4);
			c[3] = ((b0 >> 4) & 1) | ((b1 >> 3) & 2) | ((b2 >> 2) & 4);
			c[4] = ((b0 >> 3) & 1) | ((b1 >> 2) & 2) | ((b2 >> 1) & 4);
			c[5] = ((b0 >> 2) & 1) | ((b1 >> 1) & 2) | ((b2     ) & 4);
			c[6] = ((b0 >> 1) & 1) | ((b1     ) & 2) | ((b2 << 1) & 4);
			c[7] = ((b0     ) & 1) | ((b1 << 1) & 2) | ((b2 << 2) & 4);

			uint8_t* dest0 = surface_line(surface, y * 2) + x * 8;
			uint8_t* dest1 = dest0 + surface->pitch;
			for (int i = 0; i < 8; i++) {
				dest0[i] = dest1[i] = c[i] | base;
			}
		}
	}

	return CG(surface, sx * 8, sy * 2);
}