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OpenRCT2/src/openrct2/drawing/ImageImporter.cpp
Gymnasiast 4b25345d8d Create GamePalette struct
2020-05-19 21:09:51 +02:00

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/*****************************************************************************
* Copyright (c) 2014-2019 OpenRCT2 developers
*
* For a complete list of all authors, please refer to contributors.md
* Interested in contributing? Visit https://github.com/OpenRCT2/OpenRCT2
*
* OpenRCT2 is licensed under the GNU General Public License version 3.
*****************************************************************************/
#include "ImageImporter.h"
#include "../core/Imaging.h"
#include <cstring>
#include <stdexcept>
#include <string>
using namespace OpenRCT2::Drawing;
using ImportResult = ImageImporter::ImportResult;
constexpr int32_t PALETTE_TRANSPARENT = -1;
ImportResult ImageImporter::Import(
const Image& image, int32_t offsetX, int32_t 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 " + std::to_string(image.Depth));
}
const auto width = image.Width;
const auto height = image.Height;
auto pixels = GetPixels(image.Pixels.data(), width, height, flags, mode);
auto [buffer, bufferLength] = flags & IMPORT_FLAGS::RLE ? EncodeRLE(pixels.data(), width, height)
: EncodeRaw(pixels.data(), width, height);
rct_g1_element outElement;
outElement.offset = static_cast<uint8_t*>(buffer);
outElement.width = width;
outElement.height = height;
outElement.flags = (flags & IMPORT_FLAGS::RLE ? G1_FLAG_RLE_COMPRESSION : G1_FLAG_BMP);
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;
}
std::vector<int32_t> ImageImporter::GetPixels(
const uint8_t* pixels, uint32_t width, uint32_t height, IMPORT_FLAGS flags, IMPORT_MODE mode)
{
std::vector<int32_t> buffer;
buffer.reserve(width * height);
// A larger range is needed for proper dithering
auto palettedSrc = pixels;
std::unique_ptr<int16_t[]> rgbaSrcBuffer;
if (!(flags & IMPORT_FLAGS::KEEP_PALETTE))
{
rgbaSrcBuffer = std::make_unique<int16_t[]>(height * width * 4);
}
auto rgbaSrc = rgbaSrcBuffer.get();
if (!(flags & IMPORT_FLAGS::KEEP_PALETTE))
{
for (uint32_t x = 0; x < height * width * 4; x++)
{
rgbaSrc[x] = static_cast<int16_t>(pixels[x]);
}
}
for (uint32_t y = 0; y < height; y++)
{
for (uint32_t x = 0; x < width; x++)
{
int32_t 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;
buffer.push_back(paletteIndex);
}
}
return buffer;
}
std::tuple<void*, size_t> ImageImporter::EncodeRaw(const int32_t* pixels, uint32_t width, uint32_t height)
{
auto bufferLength = width * height;
auto buffer = static_cast<uint8_t*>(std::malloc(bufferLength));
for (size_t i = 0; i < bufferLength; i++)
{
auto p = pixels[i];
buffer[i] = (p == PALETTE_TRANSPARENT ? 0 : static_cast<uint8_t>(p));
}
return std::make_tuple(buffer, bufferLength);
}
std::tuple<void*, size_t> ImageImporter::EncodeRLE(const int32_t* pixels, uint32_t width, uint32_t height)
{
struct RLECode
{
uint8_t NumPixels{};
uint8_t OffsetX{};
};
auto src = pixels;
auto buffer = static_cast<uint8_t*>(std::malloc((height * 2) + (width * height * 16)));
if (buffer == nullptr)
{
throw std::bad_alloc();
}
std::fill_n(buffer, (height * 2) + (width * height * 16), 0x00);
auto yOffsets = reinterpret_cast<uint16_t*>(buffer);
auto dst = buffer + (height * 2);
for (uint32_t y = 0; y < height; y++)
{
yOffsets[y] = static_cast<uint16_t>(dst - buffer);
auto previousCode = (RLECode*)nullptr;
auto currentCode = reinterpret_cast<RLECode*>(dst);
dst += 2;
auto startX = 0;
auto npixels = 0;
bool pushRun = false;
for (uint32_t x = 0; x < width; x++)
{
int32_t paletteIndex = *src++;
if (paletteIndex == PALETTE_TRANSPARENT)
{
if (npixels != 0)
{
x--;
src--;
pushRun = true;
}
}
else
{
if (npixels == 0)
{
startX = x;
}
npixels++;
*dst++ = static_cast<uint8_t>(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 = reinterpret_cast<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 = static_cast<size_t>(dst - buffer);
buffer = static_cast<uint8_t*>(realloc(buffer, bufferLength));
if (buffer == nullptr)
{
throw std::bad_alloc();
}
return std::make_tuple(buffer, bufferLength);
}
int32_t ImageImporter::CalculatePaletteIndex(
IMPORT_MODE mode, int16_t* rgbaSrc, int32_t x, int32_t y, int32_t width, int32_t 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] - static_cast<int16_t>(palette[paletteIndex].Red);
auto dg = rgbaSrc[1] - static_cast<int16_t>(palette[paletteIndex].Green);
auto db = rgbaSrc[2] - static_cast<int16_t>(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;
}
int32_t ImageImporter::GetPaletteIndex(const GamePalette& palette, int16_t* colour)
{
if (!IsTransparentPixel(colour))
{
for (int32_t i = 0; i < PALETTE_SIZE; i++)
{
if (static_cast<int16_t>(palette[i].Red) == colour[0] && static_cast<int16_t>(palette[i].Green) == colour[1]
&& static_cast<int16_t>(palette[i].Blue) == colour[2])
{
return i;
}
}
}
return PALETTE_TRANSPARENT;
}
bool ImageImporter::IsTransparentPixel(const int16_t* colour)
{
return colour[3] < 128;
}
/**
* @returns true if pixel index is an index not used for remapping.
*/
bool ImageImporter::IsChangablePixel(int32_t 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;
}
int32_t ImageImporter::GetClosestPaletteIndex(const GamePalette& palette, const int16_t* colour)
{
auto smallestError = static_cast<uint32_t>(-1);
auto bestMatch = PALETTE_TRANSPARENT;
for (int32_t x = 0; x < PALETTE_SIZE; x++)
{
if (IsChangablePixel(x))
{
uint32_t error = (static_cast<int16_t>(palette[x].Red) - colour[0])
* (static_cast<int16_t>(palette[x].Red) - colour[0])
+ (static_cast<int16_t>(palette[x].Green) - colour[1]) * (static_cast<int16_t>(palette[x].Green) - colour[1])
+ (static_cast<int16_t>(palette[x].Blue) - colour[2]) * (static_cast<int16_t>(palette[x].Blue) - colour[2]);
if (smallestError == static_cast<uint32_t>(-1) || smallestError > error)
{
bestMatch = x;
smallestError = error;
}
}
}
return bestMatch;
}
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