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93 lines
3.7 KiB
C++
93 lines
3.7 KiB
C++
// SPDX-License-Identifier: MIT
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//
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// EmulationStation Desktop Edition
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// ImageIO.cpp
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//
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// Image I/O functions.
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//
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#include "ImageIO.h"
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#include "Log.h"
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#include <FreeImage.h>
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#include <string.h>
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std::vector<unsigned char> ImageIO::loadFromMemoryRGBA32(const unsigned char* data,
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const size_t size, size_t& width, size_t& height)
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{
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std::vector<unsigned char> rawData;
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width = 0;
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height = 0;
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FIMEMORY* fiMemory = FreeImage_OpenMemory(const_cast<BYTE*>(data), static_cast<DWORD>(size));
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if (fiMemory != nullptr) {
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// Detect the filetype from data.
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FREE_IMAGE_FORMAT format = FreeImage_GetFileTypeFromMemory(fiMemory);
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if (format != FIF_UNKNOWN && FreeImage_FIFSupportsReading(format)) {
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// File type is supported, load image.
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FIBITMAP* fiBitmap = FreeImage_LoadFromMemory(format, fiMemory);
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if (fiBitmap != nullptr) {
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// Loaded. convert to 32-bit if necessary.
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if (FreeImage_GetBPP(fiBitmap) != 32) {
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FIBITMAP* fiConverted = FreeImage_ConvertTo32Bits(fiBitmap);
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if (fiConverted != nullptr) {
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// Free original bitmap data.
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FreeImage_Unload(fiBitmap);
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fiBitmap = fiConverted;
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}
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}
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if (fiBitmap != nullptr) {
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width = FreeImage_GetWidth(fiBitmap);
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height = FreeImage_GetHeight(fiBitmap);
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// Loop through scanlines and add all pixel data to the return vector.
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// This is necessary, because width*height*bpp might not be == pitch.
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unsigned char* tempData = new unsigned char[width * height * 4];
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for (size_t i = 0; i < height; i++) {
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const BYTE* scanLine =
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FreeImage_GetScanLine(fiBitmap, static_cast<int>(i));
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memcpy(tempData + (i * width * 4), scanLine, width * 4);
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}
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// Convert from BGRA to RGBA.
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for (size_t i = 0; i < width * height; i++) {
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RGBQUAD bgra = reinterpret_cast<RGBQUAD*>(tempData)[i];
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RGBQUAD rgba;
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rgba.rgbBlue = bgra.rgbRed;
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rgba.rgbGreen = bgra.rgbGreen;
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rgba.rgbRed = bgra.rgbBlue;
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rgba.rgbReserved = bgra.rgbReserved;
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reinterpret_cast<RGBQUAD*>(tempData)[i] = rgba;
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}
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rawData = std::vector<unsigned char>(tempData, tempData + width * height * 4);
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// Free bitmap data.
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FreeImage_Unload(fiBitmap);
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delete[] tempData;
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}
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}
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else {
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LOG(LogError) << "Failed to load image from memory";
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}
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}
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else {
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LOG(LogError) << "Couldn't load image, file is missing or the file type is " <<
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(format == FIF_UNKNOWN ? "unknown" : "unsupported");
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}
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// Free fiMemory again.
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FreeImage_CloseMemory(fiMemory);
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}
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return rawData;
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}
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void ImageIO::flipPixelsVert(unsigned char* imagePx, const size_t& width, const size_t& height)
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{
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unsigned int temp;
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unsigned int* arr = reinterpret_cast<unsigned int*>(imagePx);
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for (size_t y = 0; y < height / 2; y++) {
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for (size_t x = 0; x < width; x++) {
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temp = arr[x + (y * width)];
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arr[x + (y * width)] = arr[x + (height * width) - ((y + 1) * width)];
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arr[x + (height * width) - ((y + 1) * width)] = temp;
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}
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}
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}
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