311 lines
10 KiB
C++
311 lines
10 KiB
C++
#include <ctrff/helper.hpp>
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#include <ctrff/pica.hpp>
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namespace ctrff {
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namespace Pica {
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CTRFF_API void EncodeImage(std::vector<ctrff::u8>& ret,
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std::vector<ctrff::u8> rgba, int w, int h,
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Color dst_color) {
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// Only used in rgb/rgba
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int bpp = dst_color == RGBA8888 ? 4 : 3;
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switch (dst_color) {
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case RGB565:
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ret.resize(w * h * 2);
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ctrff::RGBA2RGB565(reinterpret_cast<ctrff::u16*>(ret.data()), rgba, w, h);
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break;
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case RGB888:
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case RGBA8888:
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ret.resize(w * h * bpp);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = (y * w + x) * 4; // basic rgba indexing btw
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int dst = ctrff::TileIndex(x, y, w) * bpp;
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for (int i = 0; i < bpp; i++) {
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ret[dst + bpp - 1 - i] = rgba[src + i];
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}
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}
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}
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break;
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case A8:
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ret.resize(w * h);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = (y * w + x) * 4; // basic rgba indexing btw
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int dst = ctrff::TileIndex(x, y, w);
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ret[dst] = rgba[src + 3]; // extract alpha only
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}
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}
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break;
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case A4:
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ret.resize((w * h) >> 1);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = (y * w + x) * 4; // basic rgba indexing btw
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int dst = ctrff::TileIndex(x, y, w);
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ctrff::u8 tmp = rgba[src + 3] >> 4;
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int a4pos = dst >> 1;
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if ((dst & 1) == 0) {
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ret[a4pos] = (tmp << 4) | (ret[a4pos] & 0x0f);
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} else {
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ret[a4pos] = (ret[a4pos] & 0xf0) | tmp;
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}
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}
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}
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break;
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case L8:
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ret.resize(w * h);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = (y * w + x) * 4; // basic rgba indexing btw
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int dst = ctrff::TileIndex(x, y, w);
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// Basic luminance calculation (already used in renderd7)
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ret[dst] =
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(rgba[src + 0] * 77 + rgba[src + 1] * 150 + rgba[src + 2] * 29) >>
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8;
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}
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}
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break;
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case L4:
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ret.resize((w * h) >> 1);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = (y * w + x) * 4; // basic rgba indexing btw
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int dst = ctrff::TileIndex(x, y, w);
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// Basically same as a4 just with the luminance calculation func
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ctrff::u8 tmp = ((rgba[src + 0] * 77 + rgba[src + 1] * 150 +
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rgba[src + 2] * 29) >>
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8) >>
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4;
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int a4pos = dst >> 1;
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if ((dst & 1) == 0) {
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ret[a4pos] = (tmp << 4) | (ret[a4pos] & 0x0f);
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} else {
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ret[a4pos] = (ret[a4pos] & 0xf0) | tmp;
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}
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}
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}
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break;
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case RGBA4444:
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ret.resize(w * h * 2);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = (y * w + x) * 4; // basic rgba indexing btw
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int dst = ctrff::TileIndex(x, y, w) * 2;
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ret[dst + 0] = rgba[src + 3] >> 4;
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ret[dst + 0] |= (rgba[src + 2] >> 4) << 4;
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ret[dst + 1] = rgba[src + 1] >> 4;
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ret[dst + 1] |= (rgba[src + 0] >> 4) << 4;
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}
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}
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break;
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case RGBA5551: // not working ???
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ret.resize(w * h * 2);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = (y * w + x) * 4; // basic rgba indexing btw
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int dst = ctrff::TileIndex(x, y, w) * 2;
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ctrff::u16 px = 0;
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px |= (rgba[src + 3] < 128 ? 0 : 1) << 15; // A
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px |= ((rgba[src + 2] >> 3) & 0x1f) << 10; // BBBBB
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px |= ((rgba[src + 1] >> 3) & 0x1f) << 5; // GGGGG
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px |= ((rgba[src + 0] >> 3) & 0x1f); // RRRRR
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ret[dst] = px & 0xff;
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ret[dst + 1] = (px << 8) & 0xff;
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}
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}
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break;
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case LA8:
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ret.resize(w * h * 2);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = (y * w + x) * 4; // basic rgba indexing btw
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int dst = ctrff::TileIndex(x, y, w) * 2;
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ret[dst] =
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(rgba[src + 0] * 77 + rgba[src + 1] * 150 + rgba[src + 2] * 29) >>
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8;
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ret[dst + 1] = rgba[src + 3];
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}
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}
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break;
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case LA4:
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ret.resize(w * h);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = (y * w + x) * 4; // basic rgba indexing btw
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int dst = ctrff::TileIndex(x, y, w);
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ret[dst] = 0;
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ret[dst] |= (((rgba[src + 0] * 77 + rgba[src + 1] * 150 +
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rgba[src + 2] * 29) >>
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8) >>
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4) &
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0xf;
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ret[dst] |= (((rgba[src + 3] >> 4) & 0xf) << 4) | ret[dst];
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}
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}
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break;
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default:
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throw std::runtime_error("[ctrff] Pica: Unsupported Color format: " +
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std::to_string((int)dst_color));
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break;
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}
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}
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CTRFF_API void DecodeImage(std::vector<ctrff::u8>& ret,
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std::vector<ctrff::u8> pixels, int w, int h,
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Color src_color) {
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switch (src_color) {
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case RGB565:
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ret.resize(w * h * 4);
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ctrff::RGB565toRGBA(
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ret, reinterpret_cast<const ctrff::u16*>(pixels.data()), w, h);
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break;
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case RGB888:
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case RGBA8888:
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ret.resize(w * h * 4);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int bpp = src_color == RGBA8888 ? 4 : 3;
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int src = ctrff::TileIndex(x, y, w) * bpp;
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int dst = (y * w + x) * 4; // basic rgba indexing btw
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for (int i = 0; i < bpp; i++) {
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ret[dst + i] = pixels[src + bpp - 1 - i];
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}
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if (src_color == RGB888) {
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ret[dst + 3] = 255;
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}
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}
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}
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break;
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case A8:
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ret.resize(w * h * 4);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = ctrff::TileIndex(x, y, w);
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int dst = (y * w + x) * 4;
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ret[dst + 0] = 255;
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ret[dst + 1] = 255;
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ret[dst + 2] = 255;
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ret[dst + 3] = pixels[src];
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}
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}
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break;
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case A4: // most hated by me (tobid7)
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ret.resize(w * h * 4);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = ctrff::TileIndex(x, y, w);
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int dst = (y * w + x) * 4;
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/**
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* Basically checking by %2 aka &1 if we have a high or low nibble
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* by this we either extract the high or low one and multiply
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* by 17 aka 0x11 to get the resulting A8 Value
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*/
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ctrff::u8 a4 = src & 1 ? ((pixels[src >> 1] >> 4) & 0xf) * 0x11
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: (pixels[src >> 1] & 0xf) * 0x11;
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ret[dst + 0] = 255;
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ret[dst + 1] = 255;
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ret[dst + 2] = 255;
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ret[dst + 3] = a4;
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}
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}
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break;
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case L4: // most hated by me (tobid7)
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ret.resize(w * h * 4);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = ctrff::TileIndex(x, y, w);
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int dst = (y * w + x) * 4;
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/**
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* Same as A4
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* Basically checking by %2 aka &1 if we have a high or low nibble
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* by this we either extract the high or low one and multiply
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* by 17 aka 0x11 to get the resulting A8 Value
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*/
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ctrff::u8 a4 = src & 1 ? ((pixels[src >> 1] >> 4) & 0xf) * 0x11
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: (pixels[src >> 1] & 0xf) * 0x11;
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ret[dst + 0] = a4;
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ret[dst + 1] = a4;
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ret[dst + 2] = a4;
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ret[dst + 3] = 255;
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}
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}
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break;
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case L8:
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ret.resize(w * h * 4);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = ctrff::TileIndex(x, y, w);
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int dst = (y * w + x) * 4;
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ret[dst + 0] = pixels[src];
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ret[dst + 1] = pixels[src];
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ret[dst + 2] = pixels[src];
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ret[dst + 3] = 255;
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}
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}
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break;
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case RGBA4444:
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ret.resize(w * h * 4);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = ctrff::TileIndex(x, y, w) * 2;
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int dst = (y * w + x) * 4; // basic rgba indexing btw
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ret[dst + 0] = ((pixels[src + 1] >> 4) & 0xf) << 4;
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ret[dst + 1] = (pixels[src + 1] & 0xf) << 4;
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ret[dst + 2] = ((pixels[src + 0] >> 4) & 0xf) << 4;
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ret[dst + 3] = (pixels[src + 0] & 0xf) << 4;
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}
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}
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break;
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case RGBA5551: // not working
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ret.resize(w * h * 4);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = ctrff::TileIndex(x, y, w) * 2;
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int dst = (y * w + x) * 4; // basic rgba indexing btw
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ctrff::u16 px = ret[src] | (ret[src + 1] << 8);
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ret[dst + 0] = (px & 0x1f) * 0x1f;
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ret[dst + 1] = ((px >> 5) & 0x1f) * 0x1f;
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ret[dst + 2] = ((px >> 10) & 0x1f) * 0x1f;
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ret[dst + 3] = 255; // ((*px >> 15) & 0x1) ? 255 : 0;
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}
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}
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break;
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case LA8:
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ret.resize(w * h * 4);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = ctrff::TileIndex(x, y, w) * 2;
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int dst = (y * w + x) * 4;
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ret[dst + 0] = pixels[src];
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ret[dst + 1] = pixels[src];
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ret[dst + 2] = pixels[src];
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ret[dst + 3] = pixels[src + 1];
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}
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}
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break;
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case LA4:
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ret.resize(w * h * 4);
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for (int x = 0; x < w; x++) {
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for (int y = 0; y < h; y++) {
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int src = ctrff::TileIndex(x, y, w);
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int dst = (y * w + x) * 4;
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uint8_t l = (pixels[src] & 0xf) * 0x11;
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uint8_t a = ((pixels[src] >> 4) & 0xf) * 0x11;
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ret[dst + 0] = l;
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ret[dst + 1] = l;
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ret[dst + 2] = l;
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ret[dst + 3] = a;
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}
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}
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break;
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default:
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throw std::runtime_error("[ctrff] Pica: Unsupported Color format: " +
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std::to_string((int)src_color));
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break;
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}
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}
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} // namespace Pica
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} // namespace ctrff
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