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OpenRCT2/src/openrct2/drawing/ImageImporter.cpp
2018-05-13 01:11:56 +01:00

610 lines
17 KiB
C++

#pragma region Copyright (c) 2018 OpenRCT2 Developers
/*****************************************************************************
* OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
*
* OpenRCT2 is the work of many authors, a full list can be found in contributors.md
* For more information, visit https://github.com/OpenRCT2/OpenRCT2
*
* OpenRCT2 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* A full copy of the GNU General Public License can be found in licence.txt
*****************************************************************************/
#pragma endregion
#include <cstring>
#include <stdexcept>
#include "../core/Imaging.h"
#include "ImageImporter.h"
using namespace OpenRCT2::Drawing;
using ImportResult = ImageImporter::ImportResult;
struct RLECode
{
uint8 NumPixels{};
uint8 OffsetX{};
};
constexpr sint32 PALETTE_TRANSPARENT = -1;
ImportResult ImageImporter::Import(
const Image& image,
sint32 offsetX,
sint32 offsetY,
IMPORT_FLAGS flags,
IMPORT_MODE mode) const
{
if (image.Width > 256 || image.Height > 256)
{
throw std::invalid_argument("Only images 256x256 or less are supported.");
}
if ((flags & IMPORT_FLAGS::KEEP_PALETTE) && image.Depth != 8)
{
throw std::invalid_argument("Image is not palletted, it has bit depth of " + image.Depth);
}
if (!(flags & IMPORT_FLAGS::RLE))
{
throw std::invalid_argument("Only RLE image import is currently supported.");
}
const auto width = image.Width;
const auto height = image.Height;
const auto pixels = image.Pixels.data();
auto buffer = (uint8 *)std::malloc((height * 2) + (width * height * 16));
std::memset(buffer, 0, (height * 2) + (width * height * 16));
auto yOffsets = (uint16 *)buffer;
// A larger range is needed for proper dithering
auto palettedSrc = pixels;
std::unique_ptr<sint16[]> rgbaSrcBuffer;
if (!(flags & IMPORT_FLAGS::KEEP_PALETTE))
{
rgbaSrcBuffer = std::make_unique<sint16[]>(height * width * 4);
}
auto rgbaSrc = rgbaSrcBuffer.get();
if (!(flags & IMPORT_FLAGS::KEEP_PALETTE))
{
for (uint32 x = 0; x < height * width * 4; x++)
{
rgbaSrc[x] = (sint16)pixels[x];
}
}
auto dst = buffer + (height * 2);
for (uint32 y = 0; y < height; y++)
{
yOffsets[y] = (uint16)(dst - buffer);
auto previousCode = (RLECode *)nullptr;
auto currentCode = (RLECode *)dst;
dst += 2;
auto startX = 0;
auto npixels = 0;
bool pushRun = false;
for (uint32 x = 0; x < width; x++)
{
sint32 paletteIndex;
if (flags & IMPORT_FLAGS::KEEP_PALETTE)
{
paletteIndex = *palettedSrc;
// The 1st index is always transparent
if (paletteIndex == 0)
{
paletteIndex = PALETTE_TRANSPARENT;
}
}
else
{
paletteIndex = CalculatePaletteIndex(mode, rgbaSrc, x, y, width, height);
}
rgbaSrc += 4;
palettedSrc += 1;
if (paletteIndex == PALETTE_TRANSPARENT)
{
if (npixels != 0)
{
x--;
rgbaSrc -= 4;
palettedSrc -= 1;
pushRun = true;
}
}
else
{
if (npixels == 0)
{
startX = x;
}
npixels++;
*dst++ = (uint8)paletteIndex;
}
if (npixels == 127 || x == width - 1)
{
pushRun = true;
}
if (pushRun)
{
if (npixels > 0)
{
previousCode = currentCode;
currentCode->NumPixels = npixels;
currentCode->OffsetX = startX;
if (x == width - 1)
{
currentCode->NumPixels |= 0x80;
}
currentCode = (RLECode *)dst;
dst += 2;
}
else
{
if (previousCode == nullptr)
{
currentCode->NumPixels = 0x80;
currentCode->OffsetX = 0;
}
else
{
previousCode->NumPixels |= 0x80;
dst -= 2;
}
}
startX = 0;
npixels = 0;
pushRun = false;
}
}
}
auto bufferLength = (size_t)(dst - buffer);
buffer = (uint8 *)realloc(buffer, bufferLength);
rct_g1_element outElement;
outElement.offset = buffer;
outElement.width = width;
outElement.height = height;
outElement.flags = G1_FLAG_RLE_COMPRESSION;
outElement.x_offset = offsetX;
outElement.y_offset = offsetY;
outElement.zoomed_offset = 0;
ImportResult result;
result.Element = outElement;
result.Buffer = buffer;
result.BufferLength = bufferLength;
return result;
}
sint32 ImageImporter::CalculatePaletteIndex(IMPORT_MODE mode, sint16 * rgbaSrc, sint32 x, sint32 y, sint32 width, sint32 height)
{
auto palette = StandardPalette;
auto paletteIndex = GetPaletteIndex(palette, rgbaSrc);
if (mode == IMPORT_MODE::CLOSEST || mode == IMPORT_MODE::DITHERING)
{
if (paletteIndex == PALETTE_TRANSPARENT && !IsTransparentPixel(rgbaSrc))
{
paletteIndex = GetClosestPaletteIndex(palette, rgbaSrc);
}
}
if (mode == IMPORT_MODE::DITHERING)
{
if (!IsTransparentPixel(rgbaSrc) && IsChangablePixel(GetPaletteIndex(palette, rgbaSrc)))
{
auto dr = rgbaSrc[0] - (sint16)(palette[paletteIndex].Red);
auto dg = rgbaSrc[1] - (sint16)(palette[paletteIndex].Green);
auto db = rgbaSrc[2] - (sint16)(palette[paletteIndex].Blue);
if (x + 1 < width)
{
if (!IsTransparentPixel(rgbaSrc + 4) && IsChangablePixel(GetPaletteIndex(palette, rgbaSrc + 4)))
{
// Right
rgbaSrc[4] += dr * 7 / 16;
rgbaSrc[5] += dg * 7 / 16;
rgbaSrc[6] += db * 7 / 16;
}
}
if (y + 1 < height)
{
if (x > 0)
{
if (!IsTransparentPixel(rgbaSrc + 4 * (width - 1)) && IsChangablePixel(GetPaletteIndex(palette, rgbaSrc + 4 * (width - 1))))
{
// Bottom left
rgbaSrc[4 * (width - 1)] += dr * 3 / 16;
rgbaSrc[4 * (width - 1) + 1] += dg * 3 / 16;
rgbaSrc[4 * (width - 1) + 2] += db * 3 / 16;
}
}
// Bottom
if (!IsTransparentPixel(rgbaSrc + 4 * width) && IsChangablePixel(GetPaletteIndex(palette, rgbaSrc + 4 * width)))
{
rgbaSrc[4 * width] += dr * 5 / 16;
rgbaSrc[4 * width + 1] += dg * 5 / 16;
rgbaSrc[4 * width + 2] += db * 5 / 16;
}
if (x + 1 < width)
{
if (!IsTransparentPixel(rgbaSrc + 4 * (width + 1)) && IsChangablePixel(GetPaletteIndex(palette, rgbaSrc + 4 * (width + 1))))
{
// Bottom right
rgbaSrc[4 * (width + 1)] += dr * 1 / 16;
rgbaSrc[4 * (width + 1) + 1] += dg * 1 / 16;
rgbaSrc[4 * (width + 1) + 2] += db * 1 / 16;
}
}
}
}
}
return paletteIndex;
}
sint32 ImageImporter::GetPaletteIndex(const PaletteBGRA * palette, sint16 * colour)
{
if (!IsTransparentPixel(colour))
{
for (sint32 i = 0; i < 256; i++)
{
if ((sint16)(palette[i].Red) == colour[0] &&
(sint16)(palette[i].Green) == colour[1] &&
(sint16)(palette[i].Blue) == colour[2])
{
return i;
}
}
}
return PALETTE_TRANSPARENT;
}
bool ImageImporter::IsTransparentPixel(const sint16 * colour)
{
return colour[3] < 128;
}
/**
* @returns true if pixel index is an index not used for remapping.
*/
bool ImageImporter::IsChangablePixel(sint32 paletteIndex)
{
if (paletteIndex == PALETTE_TRANSPARENT)
return true;
if (paletteIndex == 0)
return false;
if (paletteIndex >= 203 && paletteIndex < 214)
return false;
if (paletteIndex == 226)
return false;
if (paletteIndex >= 227 && paletteIndex < 229)
return false;
if (paletteIndex >= 243)
return false;
return true;
}
sint32 ImageImporter::GetClosestPaletteIndex(const PaletteBGRA * palette, const sint16 * colour)
{
auto smallestError = (uint32)-1;
auto bestMatch = PALETTE_TRANSPARENT;
for (sint32 x = 0; x < 256; x++)
{
if (IsChangablePixel(x))
{
uint32 error =
((sint16)(palette[x].Red) - colour[0]) * ((sint16)(palette[x].Red) - colour[0]) +
((sint16)(palette[x].Green) - colour[1]) * ((sint16)(palette[x].Green) - colour[1]) +
((sint16)(palette[x].Blue) - colour[2]) * ((sint16)(palette[x].Blue) - colour[2]);
if (smallestError == (uint32)-1 || smallestError > error)
{
bestMatch = x;
smallestError = error;
}
}
}
return bestMatch;
}
const PaletteBGRA ImageImporter::StandardPalette[256] =
{
// 0 (unused)
{ 0, 0, 0, 255 },
// 1 - 9 (misc. e.g. font and water)
{ 0, 0, 0, 255 },
{ 0, 0, 0, 255 },
{ 0, 0, 0, 255 },
{ 0, 0, 0, 255 },
{ 0, 0, 0, 255 },
{ 0, 0, 0, 255 },
{ 0, 0, 0, 255 },
{ 0, 0, 0, 255 },
{ 0, 0, 0, 255 },
//
{ 35, 35, 23, 255 },
{ 51, 51, 35, 255 },
{ 67, 67, 47, 255 },
{ 83, 83, 63, 255 },
{ 99, 99, 75, 255 },
{ 115, 115, 91, 255 },
{ 131, 131, 111, 255 },
{ 151, 151, 131, 255 },
{ 175, 175, 159, 255 },
{ 195, 195, 183, 255 },
{ 219, 219, 211, 255 },
{ 243, 243, 239, 255 },
{ 0, 47, 51, 255 },
{ 0, 59, 63, 255 },
{ 11, 75, 79, 255 },
{ 19, 91, 91, 255 },
{ 31, 107, 107, 255 },
{ 47, 123, 119, 255 },
{ 59, 139, 135, 255 },
{ 79, 155, 151, 255 },
{ 95, 175, 167, 255 },
{ 115, 191, 187, 255 },
{ 139, 207, 203, 255 },
{ 163, 227, 223, 255 },
{ 7, 43, 67, 255 },
{ 11, 59, 87, 255 },
{ 23, 75, 111, 255 },
{ 31, 87, 127, 255 },
{ 39, 99, 143, 255 },
{ 51, 115, 159, 255 },
{ 67, 131, 179, 255 },
{ 87, 151, 191, 255 },
{ 111, 175, 203, 255 },
{ 135, 199, 219, 255 },
{ 163, 219, 231, 255 },
{ 195, 239, 247, 255 },
{ 0, 27, 71, 255 },
{ 0, 43, 95, 255 },
{ 0, 63, 119, 255 },
{ 7, 83, 143, 255 },
{ 7, 111, 167, 255 },
{ 15, 139, 191, 255 },
{ 19, 167, 215, 255 },
{ 27, 203, 243, 255 },
{ 47, 231, 255, 255 },
{ 95, 243, 255, 255 },
{ 143, 251, 255, 255 },
{ 195, 255, 255, 255 },
{ 0, 0, 35, 255 },
{ 0, 0, 79, 255 },
{ 7, 7, 95, 255 },
{ 15, 15, 111, 255 },
{ 27, 27, 127, 255 },
{ 39, 39, 143, 255 },
{ 59, 59, 163, 255 },
{ 79, 79, 179, 255 },
{ 103, 103, 199, 255 },
{ 127, 127, 215, 255 },
{ 159, 159, 235, 255 },
{ 191, 191, 255, 255 },
{ 19, 51, 27, 255 },
{ 23, 63, 35, 255 },
{ 31, 79, 47, 255 },
{ 39, 95, 59, 255 },
{ 43, 111, 71, 255 },
{ 51, 127, 87, 255 },
{ 59, 143, 99, 255 },
{ 67, 155, 115, 255 },
{ 75, 171, 131, 255 },
{ 83, 187, 147, 255 },
{ 95, 203, 163, 255 },
{ 103, 219, 183, 255 },
{ 27, 55, 31, 255 },
{ 35, 71, 47, 255 },
{ 43, 83, 59, 255 },
{ 55, 99, 75, 255 },
{ 67, 111, 91, 255 },
{ 79, 135, 111, 255 },
{ 95, 159, 135, 255 },
{ 111, 183, 159, 255 },
{ 127, 207, 183, 255 },
{ 147, 219, 195, 255 },
{ 167, 231, 207, 255 },
{ 191, 247, 223, 255 },
{ 0, 63, 15, 255 },
{ 0, 83, 19, 255 },
{ 0, 103, 23, 255 },
{ 0, 123, 31, 255 },
{ 7, 143, 39, 255 },
{ 23, 159, 55, 255 },
{ 39, 175, 71, 255 },
{ 63, 191, 91, 255 },
{ 87, 207, 111, 255 },
{ 115, 223, 139, 255 },
{ 143, 239, 163, 255 },
{ 179, 255, 195, 255 },
{ 19, 43, 79, 255 },
{ 27, 55, 99, 255 },
{ 43, 71, 119, 255 },
{ 59, 87, 139, 255 },
{ 67, 99, 167, 255 },
{ 83, 115, 187, 255 },
{ 99, 131, 207, 255 },
{ 115, 151, 215, 255 },
{ 131, 171, 227, 255 },
{ 151, 191, 239, 255 },
{ 171, 207, 247, 255 },
{ 195, 227, 255, 255 },
{ 55, 19, 15, 255 },
{ 87, 43, 39, 255 },
{ 103, 55, 51, 255 },
{ 119, 67, 63, 255 },
{ 139, 83, 83, 255 },
{ 155, 99, 99, 255 },
{ 175, 119, 119, 255 },
{ 191, 139, 139, 255 },
{ 207, 159, 159, 255 },
{ 223, 183, 183, 255 },
{ 239, 211, 211, 255 },
{ 255, 239, 239, 255 },
{ 111, 27, 0, 255 },
{ 151, 39, 0, 255 },
{ 167, 51, 7, 255 },
{ 187, 67, 15, 255 },
{ 203, 83, 27, 255 },
{ 223, 103, 43, 255 },
{ 227, 135, 67, 255 },
{ 231, 163, 91, 255 },
{ 239, 187, 119, 255 },
{ 243, 211, 143, 255 },
{ 251, 231, 175, 255 },
{ 255, 247, 215, 255 },
{ 15, 43, 11, 255 },
{ 23, 55, 15, 255 },
{ 31, 71, 23, 255 },
{ 43, 83, 35, 255 },
{ 59, 99, 47, 255 },
{ 75, 115, 59, 255 },
{ 95, 135, 79, 255 },
{ 119, 155, 99, 255 },
{ 139, 175, 123, 255 },
{ 167, 199, 147, 255 },
{ 195, 219, 175, 255 },
{ 223, 243, 207, 255 },
{ 95, 0, 63, 255 },
{ 115, 7, 75, 255 },
{ 127, 15, 83, 255 },
{ 143, 31, 95, 255 },
{ 155, 43, 107, 255 },
{ 171, 63, 123, 255 },
{ 187, 83, 135, 255 },
{ 199, 103, 155, 255 },
{ 215, 127, 171, 255 },
{ 231, 155, 191, 255 },
{ 243, 195, 215, 255 },
{ 255, 235, 243, 255 },
{ 0, 0, 63, 255 },
{ 0, 0, 87, 255 },
{ 0, 0, 115, 255 },
{ 0, 0, 143, 255 },
{ 0, 0, 171, 255 },
{ 0, 0, 199, 255 },
{ 0, 7, 227, 255 },
{ 0, 7, 255, 255 },
{ 67, 79, 255, 255 },
{ 115, 123, 255, 255 },
{ 163, 171, 255, 255 },
{ 215, 219, 255, 255 },
{ 0, 39, 79, 255 },
{ 0, 51, 111, 255 },
{ 0, 63, 147, 255 },
{ 0, 71, 183, 255 },
{ 0, 79, 219, 255 },
{ 0, 83, 255, 255 },
{ 23, 111, 255, 255 },
{ 51, 139, 255, 255 },
{ 79, 163, 255, 255 },
{ 107, 183, 255, 255 },
{ 135, 203, 255, 255 },
{ 163, 219, 255, 255 },
{ 47, 51, 0, 255 },
{ 55, 63, 0, 255 },
{ 67, 75, 0, 255 },
{ 79, 87, 0, 255 },
{ 99, 107, 7, 255 },
{ 119, 127, 23, 255 },
{ 143, 147, 43, 255 },
{ 163, 167, 71, 255 },
{ 187, 187, 99, 255 },
{ 207, 207, 131, 255 },
{ 231, 231, 171, 255 },
{ 255, 255, 207, 255 },
// 203 - 214 (Secondary remap)
{ 27, 0, 63, 255 },
{ 51, 0, 103, 255 },
{ 63, 11, 123, 255 },
{ 79, 23, 143, 255 },
{ 95, 31, 163, 255 },
{ 111, 39, 183, 255 },
{ 143, 59, 219, 255 },
{ 171, 91, 239, 255 },
{ 187, 119, 243, 255 },
{ 203, 151, 247, 255 },
{ 223, 183, 251, 255 },
{ 239, 215, 255, 255 },
// 214 - 225 (Brown)
{ 0, 19, 39, 255 },
{ 7, 31, 55, 255 },
{ 15, 47, 71, 255 },
{ 31, 63, 91, 255 },
{ 51, 83, 107, 255 },
{ 75, 103, 123, 255 },
{ 107, 127, 143, 255 },
{ 127, 147, 163, 255 },
{ 147, 171, 187, 255 },
{ 171, 195, 207, 255 },
{ 195, 219, 231, 255 },
{ 223, 243, 255, 255 },
// 226 (unknown)
{ 75, 75, 55, 255 },
// 227 - 229 (tertiary remap)
{ 0, 183, 255, 255 },
{ 0, 219, 255, 255 },
{ 0, 255, 255, 255 },
// 230 - 239 (water)
{ 99, 107, 7, 255 },
{ 99, 107, 7, 255 },
{ 135, 143, 39, 255 },
{ 123, 131, 27, 255 },
{ 99, 107, 7, 255 },
{ 151, 155, 55, 255 },
{ 151, 155, 55, 255 },
{ 227, 227, 155, 255 },
{ 203, 203, 115, 255 },
{ 151, 155, 55, 255 },
// 240 - 242 (chain lift)
{ 91, 91, 67, 255 },
{ 107, 107, 83, 255 },
{ 123, 123, 99, 255 },
// Old 243 - 245, changed to nice shade remap below
// { 47, 47, 47, 255 },
// { 47, 47, 47, 255 },
// { 47, 71, 87, 255 },
// 243 to 254 (primary remap)
{ 47, 51, 111, 255 },
{ 47, 55, 131, 255 },
{ 51, 63, 151, 255 },
{ 51, 67, 171, 255 },
{ 47, 75, 191, 255 },
{ 43, 79, 211, 255 },
{ 35, 87, 231, 255 },
{ 31, 95, 255, 255 },
{ 39, 127, 255, 255 },
{ 51, 155, 255, 255 },
{ 63, 183, 255, 255 },
{ 75, 207, 255, 255 },
// 255 (unused?)
{ 0, 0, 0, 255 }
};