SFML/src/SFML/Graphics/Image.cpp at master · anprogrammer/SFML · GitHub

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////////////////////////////////////////////////////////////

// SFML - Simple and Fast Multimedia Library

// This software is provided 'as-is', without any express or implied warranty.

// In no event will the authors be held liable for any damages arising from the use of this software.

// Permission is granted to anyone to use this software for any purpose,

// including commercial applications, and to alter it and redistribute it freely,

// subject to the following restrictions:

// 1. The origin of this software must not be misrepresented;

// you must not claim that you wrote the original software.

// If you use this software in a product, an acknowledgment

// in the product documentation would be appreciated but is not required.

// 2. Altered source versions must be plainly marked as such,

// and must not be misrepresented as being the original software.

// 3. This notice may not be removed or altered from any source distribution.

////////////////////////////////////////////////////////////

// Headers

////////////////////////////////////////////////////////////

#include <SFML/Graphics/Image.hpp>

#include <SFML/Graphics/ImageLoader.hpp>

#include <SFML/System/Err.hpp>

#ifdef SFML_SYSTEM_ANDROID

#include <SFML/System/Android/ResourceStream.hpp>

#endif

#include <algorithm>

#include <cstring>

namespace sf

{

////////////////////////////////////////////////////////////

Image::Image() :

m_size(0, 0)

{

}

////////////////////////////////////////////////////////////

Image::~Image()

{

}

////////////////////////////////////////////////////////////

void Image::create(unsigned int width, unsigned int height, const Color& color)

{

if (width && height)

{

// Create a new pixel buffer first for exception safety's sake

std::vector<Uint8> newPixels(width * height * 4);

// Fill it with the specified color

Uint8* ptr = &newPixels[0];

Uint8* end = ptr + newPixels.size();

while (ptr < end)

{

*ptr++ = color.r;

*ptr++ = color.g;

*ptr++ = color.b;

*ptr++ = color.a;

}

// Commit the new pixel buffer

m_pixels.swap(newPixels);

// Assign the new size

m_size.x = width;

m_size.y = height;

}

else

{

// Dump the pixel buffer

std::vector<Uint8>().swap(m_pixels);

// Assign the new size

m_size.x = 0;

m_size.y = 0;

}

////////////////////////////////////////////////////////////

void Image::create(unsigned int width, unsigned int height, const Uint8* pixels)

{

if (pixels && width && height)

{

// Create a new pixel buffer first for exception safety's sake

std::vector<Uint8> newPixels(pixels, pixels + width * height * 4);

// Commit the new pixel buffer

m_pixels.swap(newPixels);

// Assign the new size

m_size.x = width;

m_size.y = height;

}

else

{

// Dump the pixel buffer

std::vector<Uint8>().swap(m_pixels);

// Assign the new size

m_size.x = 0;

m_size.y = 0;

}

////////////////////////////////////////////////////////////

bool Image::loadFromFile(const std::string& filename)

{

#ifndef SFML_SYSTEM_ANDROID

return priv::ImageLoader::getInstance().loadImageFromFile(filename, m_pixels, m_size);

#else

priv::ResourceStream stream(filename);

return loadFromStream(stream);

#endif

}

////////////////////////////////////////////////////////////

bool Image::loadFromMemory(const void* data, std::size_t size)

{

return priv::ImageLoader::getInstance().loadImageFromMemory(data, size, m_pixels, m_size);

}

////////////////////////////////////////////////////////////

bool Image::loadFromStream(InputStream& stream)

{

return priv::ImageLoader::getInstance().loadImageFromStream(stream, m_pixels, m_size);

}

////////////////////////////////////////////////////////////

bool Image::saveToFile(const std::string& filename) const

{

return priv::ImageLoader::getInstance().saveImageToFile(filename, m_pixels, m_size);

}

////////////////////////////////////////////////////////////

Vector2u Image::getSize() const

{

return m_size;

}

////////////////////////////////////////////////////////////

void Image::createMaskFromColor(const Color& color, Uint8 alpha)

{

// Make sure that the image is not empty

if (!m_pixels.empty())

{

// Replace the alpha of the pixels that match the transparent color

Uint8* ptr = &m_pixels[0];

Uint8* end = ptr + m_pixels.size();

while (ptr < end)

{

if ((ptr[0] == color.r) && (ptr[1] == color.g) && (ptr[2] == color.b) && (ptr[3] == color.a))

ptr[3] = alpha;

ptr += 4;

}

////////////////////////////////////////////////////////////

void Image::copy(const Image& source, unsigned int destX, unsigned int destY, const IntRect& sourceRect, bool applyAlpha)

{

// Make sure that both images are valid

if ((source.m_size.x == 0) || (source.m_size.y == 0) || (m_size.x == 0) || (m_size.y == 0))

return;

// Adjust the source rectangle

IntRect srcRect = sourceRect;

if (srcRect.width == 0 || (srcRect.height == 0))

{

srcRect.left = 0;

srcRect.top = 0;

srcRect.width = source.m_size.x;

srcRect.height = source.m_size.y;

}

else

{

if (srcRect.left < 0) srcRect.left = 0;

if (srcRect.top < 0) srcRect.top = 0;

if (srcRect.width > static_cast<int>(source.m_size.x)) srcRect.width = source.m_size.x;

if (srcRect.height > static_cast<int>(source.m_size.y)) srcRect.height = source.m_size.y;

}

// Then find the valid bounds of the destination rectangle

int width = srcRect.width;

int height = srcRect.height;

if (destX + width > m_size.x) width = m_size.x - destX;

if (destY + height > m_size.y) height = m_size.y - destY;

// Make sure the destination area is valid

if ((width <= 0) || (height <= 0))

return;

// Precompute as much as possible

int pitch = width * 4;

int rows = height;

int srcStride = source.m_size.x * 4;

int dstStride = m_size.x * 4;

const Uint8* srcPixels = &source.m_pixels[0] + (srcRect.left + srcRect.top * source.m_size.x) * 4;

Uint8* dstPixels = &m_pixels[0] + (destX + destY * m_size.x) * 4;

// Copy the pixels

if (applyAlpha)

{

// Interpolation using alpha values, pixel by pixel (slower)

for (int i = 0; i < rows; ++i)

{

for (int j = 0; j < width; ++j)

{

// Get a direct pointer to the components of the current pixel

const Uint8* src = srcPixels + j * 4;

Uint8* dst = dstPixels + j * 4;

// Interpolate RGBA components using the alpha value of the source pixel

Uint8 alpha = src[3];

dst[0] = (src[0] * alpha + dst[0] * (255 - alpha)) / 255;

dst[1] = (src[1] * alpha + dst[1] * (255 - alpha)) / 255;

dst[2] = (src[2] * alpha + dst[2] * (255 - alpha)) / 255;

dst[3] = alpha + dst[3] * (255 - alpha) / 255;

}

srcPixels += srcStride;

dstPixels += dstStride;

}

else

{

// Optimized copy ignoring alpha values, row by row (faster)

for (int i = 0; i < rows; ++i)

{

std::memcpy(dstPixels, srcPixels, pitch);

srcPixels += srcStride;

dstPixels += dstStride;

}

////////////////////////////////////////////////////////////

void Image::setPixel(unsigned int x, unsigned int y, const Color& color)

{

Uint8* pixel = &m_pixels[(x + y * m_size.x) * 4];

*pixel++ = color.r;

*pixel++ = color.g;

*pixel++ = color.b;

*pixel++ = color.a;

}

////////////////////////////////////////////////////////////

Color Image::getPixel(unsigned int x, unsigned int y) const

{

const Uint8* pixel = &m_pixels[(x + y * m_size.x) * 4];

return Color(pixel[0], pixel[1], pixel[2], pixel[3]);

}

////////////////////////////////////////////////////////////

const Uint8* Image::getPixelsPtr() const

{

if (!m_pixels.empty())

{

return &m_pixels[0];

}

else

{

err() << "Trying to access the pixels of an empty image" << std::endl;

return NULL;

}

////////////////////////////////////////////////////////////

void Image::flipHorizontally()

{

if (!m_pixels.empty())

{

std::size_t rowSize = m_size.x * 4;

for (std::size_t y = 0; y < m_size.y; ++y)

{

std::vector<Uint8>::iterator left = m_pixels.begin() + y * rowSize;

std::vector<Uint8>::iterator right = m_pixels.begin() + (y + 1) * rowSize - 4;

for (std::size_t x = 0; x < m_size.x / 2; ++x)

{

std::swap_ranges(left, left + 4, right);

left += 4;

right -= 4;

}

////////////////////////////////////////////////////////////

void Image::flipVertically()

{

if (!m_pixels.empty())

{

std::size_t rowSize = m_size.x * 4;

std::vector<Uint8>::iterator top = m_pixels.begin();

std::vector<Uint8>::iterator bottom = m_pixels.end() - rowSize;

for (std::size_t y = 0; y < m_size.y / 2; ++y)

{

std::swap_ranges(top, top + rowSize, bottom);

top += rowSize;

bottom -= rowSize;

}

} // namespace sf

SFML/src/SFML/Graphics/Image.cpp at master · anprogrammer/SFML · GitHub

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