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love / src / modules / image / ImageData.cpp

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/**
* Copyright (c) 2006-2012 LOVE Development Team
*
* 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.
**/

#include "ImageData.h"

namespace love
{
namespace image
{
	void ImageData::paste(ImageData * src, int dx, int dy, int sx, int sy, int sw, int sh)
	{
		pixel * s = (pixel *)src->getData();
		pixel * d = (pixel *)getData();

		// Check bounds; if the data ends up completely out of bounds, get out early.
		if (sx >= src->getWidth() || sx + sw < 0 || sy >= src->getHeight() || sy + sh < 0
		 || dx >= getWidth() || dx + sw < 0 || dy >= getHeight() || dy + sh < 0)
			return;

		// Normalize values to the inside of both images.
		if (dx < 0) { sw += dx; sx -= dx; dx = 0; }
		if (dy < 0) { sh += dy; sy -= dy; dy = 0; }
		if (sx < 0) { sw += sx; dx -= sx; sx = 0; }
		if (sy < 0) { sh += sy; dy -= sy; sy = 0; }
		if (dx + sw > getWidth()) { sw = getWidth() - dx; }
		if (dy + sh > getHeight()) { sh = getHeight() - dy; }
		if (sx + sw > src->getWidth()) { sw = src->getWidth() - sx; }
		if (sy + sh > src->getHeight()) { sh = src->getHeight() - sy; }

		// If the dimensions match up, copy the entire memory stream in one go
		if (sw == getWidth() && getWidth() == src->getWidth()
		 && sh == getHeight() && getHeight() == src->getHeight())
			memcpy(d, s, sizeof(pixel) * sw * sh);
		else if (sw > 0 && sh > 0) // Otherwise, copy each row individually
		{
			for (int i = 0; i < sh; i++)
			{
				memcpy(d + dx + (i + dy) * getWidth(), s + sx + (i + sy) * src->getWidth(), sizeof(pixel) * sw);
			}
		}
	}

	bool ImageData::inside(int x, int y) const
	{
		return (x >= 0 && x < getWidth() && y >= 0 && y < getHeight());
	}

	bool ImageData::getConstant(const char * in, ImageData::Format & out)
	{
		return formats.find(in, out);
	}

	bool ImageData::getConstant(ImageData::Format in, const char *& out)
	{
		return formats.find(in, out);
	}

	StringMap<ImageData::Format, ImageData::FORMAT_MAX_ENUM>::Entry ImageData::formatEntries[] =
	{
		{"tga", ImageData::FORMAT_TGA},
		{"bmp", ImageData::FORMAT_BMP},
		{"gif", ImageData::FORMAT_GIF},
		{"jpg", ImageData::FORMAT_JPG},
		{"png", ImageData::FORMAT_PNG},
	};

	StringMap<ImageData::Format, ImageData::FORMAT_MAX_ENUM> ImageData::formats(ImageData::formatEntries, sizeof(ImageData::formatEntries));

} // image
} // love