redquark-amiberry-rb/external/libguisan/src/sdl/sdl2graphics.cpp

/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 * Copyright (c) 2016, 2018, 2019 Gwilherm Baudic
 *                                                         Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
 *                                               .)j(] .d_/ '-(  P .   S
 * License: (BSD)                                <Td/Z <fP"5(\"??"\a.  .L
 * Redistribution and use in source and          _dV>ws?a-?'      ._/L  #'
 * binary forms, with or without                 )4d[#7r, .   '     )d`)[
 * modification, are permitted provided         _Q-5'5W..j/?'   -?!\)cam'
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * For comments regarding functions please see the header file.
 */

#include "guisan/sdl/sdl2graphics.hpp"

#include "guisan/exception.hpp"
#include "guisan/font.hpp"
#include "guisan/image.hpp"
#include "guisan/sdl/sdlimage.hpp"
#include "guisan/sdl/sdlpixel.hpp"

// For some reason an old version of MSVC did not like std::abs,
// so we added this macro.
#ifndef ABS
#define ABS(x) ((x)<0?-(x):(x))
#endif

namespace gcn
{
	SDL2Graphics::SDL2Graphics()
	{
		mAlpha = false;
	}

	SDL2Graphics::~SDL2Graphics()
	{
		if (mRenderTarget != nullptr)
		{
			SDL_DestroyTexture(mTexture);
			SDL_FreeSurface(mTarget);
		}
	}

	void SDL2Graphics::_beginDraw()
	{
		Rectangle area;
		area.x = 0;
		area.y = 0;
		area.width = mTarget->w;
		area.height = mTarget->h;
		pushClipArea(area);
	}

	void SDL2Graphics::_endDraw()
	{
		popClipArea();
	}

	void SDL2Graphics::setTarget(SDL_Renderer* renderer, int width, int height)
	{
		mRenderTarget = renderer;
		// An internal surface is still required to be able to handle surfaces and colorkeys
		mTarget = SDL_CreateRGBSurface(0, width, height, 32, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
		SDL_FillRect(mTarget, nullptr, SDL_MapRGB(mTarget->format, 0xff, 0, 0xff));
		SDL_SetColorKey(mTarget, SDL_TRUE, SDL_MapRGB(mTarget->format, 0xff, 0, 0xff)); // magenta, Guisan default
		SDL_SetSurfaceBlendMode(mTarget, SDL_BLENDMODE_NONE); // needed to cleanup temp data properly
		mTexture = SDL_CreateTextureFromSurface(mRenderTarget, mTarget);
		SDL_SetTextureBlendMode(mTexture, SDL_BLENDMODE_BLEND);
	}

	bool SDL2Graphics::pushClipArea(Rectangle area)
	{
		SDL_Rect rect;
		const auto result = Graphics::pushClipArea(area);

		const auto& carea = mClipStack.top();
		rect.x = carea.x;
		rect.y = carea.y;
		rect.w = carea.width;
		rect.h = carea.height;

		SDL_RenderSetClipRect(mRenderTarget, &rect);

		return result;
	}

	void SDL2Graphics::popClipArea()
	{
		Graphics::popClipArea();

		if (mClipStack.empty())
		{
			return;
		}

		const auto& carea = mClipStack.top();
		SDL_Rect rect;
		rect.x = carea.x;
		rect.y = carea.y;
		rect.w = carea.width;
		rect.h = carea.height;

		SDL_RenderSetClipRect(mRenderTarget, &rect);
	}

	SDL_Renderer* SDL2Graphics::getTarget() const
	{
		return mRenderTarget;
	}

	void SDL2Graphics::drawImage(const Image* image, int srcX,
								 int srcY, int dstX, int dstY,
								 int width, int height)
	{
		if (mClipStack.empty())
		{
			throw GCN_EXCEPTION("Clip stack is empty, perhaps you"
				"called a draw function outside of _beginDraw() and _endDraw()?");
		}

		const auto& top = mClipStack.top();
		SDL_Rect src;
		SDL_Rect dst;
		SDL_Rect temp;
		src.x = srcX;
		src.y = srcY;
		src.w = width;
		src.h = height;
		dst.x = dstX + top.xOffset;
		dst.y = dstY + top.yOffset;
		dst.w = width;
		dst.h = height;
		temp.x = 0;
		temp.y = 0;
		temp.w = width;
		temp.h = height;

		const auto* const srcImage = dynamic_cast<const SDLImage*>(image);

		if (srcImage == nullptr)
		{
			throw GCN_EXCEPTION("Trying to draw an image of unknown format, must be an SDLImage.");
		}

		if (srcImage->getTexture() == nullptr)
		{
			SDL_FillRect(mTarget, &temp, SDL_MapRGBA(mTarget->format, 0xff, 0, 0xff, 0));
			SDL_BlitSurface(srcImage->getSurface(), &src, mTarget, &temp);
			SDL_UpdateTexture(mTexture, &temp, mTarget->pixels, mTarget->pitch);
			SDL_RenderCopy(mRenderTarget, mTexture, &temp, &dst);
		}
		else
		{
			SDL_RenderCopy(mRenderTarget, srcImage->getTexture(), &src, &dst);
		}
	}

	void SDL2Graphics::fillRectangle(const Rectangle& rectangle)
	{
		if (mClipStack.empty())
		{
			throw GCN_EXCEPTION("Clip stack is empty, perhaps you"
				"called a draw function outside of _beginDraw() and _endDraw()?");
		}

		const auto& top = mClipStack.top();

		auto area = rectangle;
		area.x += top.xOffset;
		area.y += top.yOffset;

		if (!area.intersect(top))
		{
			return;
		}

		if (mAlpha)
		{
			const auto x1 = area.x > top.x ? area.x : top.x;
			const auto y1 = area.y > top.y ? area.y : top.y;
			const auto x2 = area.x + area.width < top.x + top.width ? area.x + area.width : top.x + top.width;
			const auto y2 = area.y + area.height < top.y + top.height ? area.y + area.height : top.y + top.height;
			
			SDL_Rect rect;
			rect.x = x1;
			rect.y = y1;
			rect.w = x2 - x1;
			rect.h = y2 - y1;

			saveRenderColor();
			SDL_SetRenderDrawColor(mRenderTarget, mColor.r, mColor.g, mColor.b, mColor.a);
			SDL_RenderFillRect(mRenderTarget, &rect);
			restoreRenderColor();
		}
		else
		{
			SDL_Rect rect;
			rect.x = area.x;
			rect.y = area.y;
			rect.w = area.width;
			rect.h = area.height;

			auto color = SDL_MapRGBA(mTarget->format, mColor.r, mColor.g, mColor.b, mColor.a);
			saveRenderColor();
			SDL_SetRenderDrawColor(mRenderTarget, mColor.r, mColor.g, mColor.b, mColor.a);
			SDL_RenderFillRect(mRenderTarget, &rect);
			restoreRenderColor();
		}
	}

	void SDL2Graphics::drawPoint(int x, int y)
	{
		if (mClipStack.empty())
		{
			throw GCN_EXCEPTION("Clip stack is empty, perhaps you"
				"called a draw function outside of _beginDraw() and _endDraw()?");
		}

		const auto& top = mClipStack.top();

		x += top.xOffset;
		y += top.yOffset;

		if (!top.isPointInRect(x, y))
			return;

		saveRenderColor();
		SDL_SetRenderDrawColor(mRenderTarget, mColor.r, mColor.g, mColor.b, mColor.a);
		/*if (mAlpha)
{
SDLputPixelAlpha(mTarget, x, y, mColor);

}
else
{
SDLputPixel(mTarget, x, y, mColor);
}*/
		SDL_RenderDrawPoint(mRenderTarget, x, y);
		restoreRenderColor();
	}

	void SDL2Graphics::drawHLine(int x1, int y, int x2)
	{
		if (mClipStack.empty())
		{
			throw GCN_EXCEPTION("Clip stack is empty, perhaps you"
				"called a draw function outside of _beginDraw() and _endDraw()?");
		}
		const auto& top = mClipStack.top();

		x1 += top.xOffset;
		y += top.yOffset;
		x2 += top.xOffset;

		if (y < top.y || y >= top.y + top.height)
			return;

		if (x1 > x2)
		{
			x1 ^= x2;
			x2 ^= x1;
			x1 ^= x2;
		}

		if (top.x > x1)
		{
			if (top.x > x2)
			{
				return;
			}
			x1 = top.x;
		}

		if (top.x + top.width <= x2)
		{
			if (top.x + top.width <= x1)
			{
				return;
			}
			x2 = top.x + top.width - 1;
		}

		saveRenderColor();
		SDL_SetRenderDrawColor(mRenderTarget, mColor.r, mColor.g, mColor.b, mColor.a);
		SDL_RenderDrawLine(mRenderTarget, x1, y, x2, y);
		restoreRenderColor();
	}

	void SDL2Graphics::drawVLine(int x, int y1, int y2)
	{
		if (mClipStack.empty())
		{
			throw GCN_EXCEPTION("Clip stack is empty, perhaps you"
				"called a draw function outside of _beginDraw() and _endDraw()?");
		}
		const auto& top = mClipStack.top();

		x += top.xOffset;
		y1 += top.yOffset;
		y2 += top.yOffset;

		if (x < top.x || x >= top.x + top.width)
			return;

		if (y1 > y2)
		{
			y1 ^= y2;
			y2 ^= y1;
			y1 ^= y2;
		}

		if (top.y > y1)
		{
			if (top.y > y2)
			{
				return;
			}
			y1 = top.y;
		}

		if (top.y + top.height <= y2)
		{
			if (top.y + top.height <= y1)
			{
				return;
			}
			y2 = top.y + top.height - 1;
		}

		saveRenderColor();
		SDL_SetRenderDrawColor(mRenderTarget, mColor.r, mColor.g, mColor.b, mColor.a);
		SDL_RenderDrawLine(mRenderTarget, x, y1, x, y2);
		restoreRenderColor();
	}

	void SDL2Graphics::drawRectangle(const Rectangle& rectangle)
	{
		const auto x1 = rectangle.x;
		const auto x2 = rectangle.x + rectangle.width - 1;
		const auto y1 = rectangle.y;
		const auto y2 = rectangle.y + rectangle.height - 1;

		drawHLine(x1, y1, x2);
		drawHLine(x1, y2, x2);

		drawVLine(x1, y1, y2);
		drawVLine(x2, y1, y2);
	}

	void SDL2Graphics::drawLine(int x1, int y1, int x2, int y2)
	{
		if (mClipStack.empty())
		{
			throw GCN_EXCEPTION("Clip stack is empty, perhaps you"
				"called a draw function outside of _beginDraw() and _endDraw()?");
		}
		const auto& top = mClipStack.top();

		x1 += top.xOffset;
		y1 += top.yOffset;
		x2 += top.xOffset;
		y2 += top.yOffset;

		saveRenderColor();
		SDL_SetRenderDrawColor(mRenderTarget, mColor.r, mColor.g, mColor.b, mColor.a);
		SDL_RenderDrawLine(mRenderTarget, x1, y1, x2, y2);
		restoreRenderColor();
	}

	void SDL2Graphics::setColor(const Color& color)
	{
		mColor = color;

		mAlpha = color.a != 255;
	}

	const Color& SDL2Graphics::getColor()
	{
		return mColor;
	}

	void SDL2Graphics::drawSDLSurface(SDL_Surface* surface, SDL_Rect source,
									  SDL_Rect destination)
	{
		if (mClipStack.empty())
		{
			throw GCN_EXCEPTION("Clip stack is empty, perhaps you"
				"called a draw function outside of _beginDraw() and _endDraw()?");
		}
		const auto& top = mClipStack.top();

		destination.x += top.xOffset;
		destination.y += top.yOffset;
		destination.w = source.w;
		destination.h = source.h;
		SDL_Rect temp;
		temp.x = 0;
		temp.y = 0;
		temp.w = source.w;
		temp.h = source.h;

		SDL_FillRect(mTarget, &temp, SDL_MapRGBA(mTarget->format, 0xff, 0, 0xff, 0));
		SDL_BlitSurface(surface, &source, mTarget, &temp);
		SDL_UpdateTexture(mTexture, &temp, mTarget->pixels, mTarget->pitch);
		SDL_RenderCopy(mRenderTarget, mTexture, &temp, &destination);
	}

	void SDL2Graphics::drawSDLTexture(SDL_Texture* texture, SDL_Rect source,
									  SDL_Rect destination)
	{
		if (mClipStack.empty())
		{
			throw GCN_EXCEPTION("Clip stack is empty, perhaps you"
				"called a draw function outside of _beginDraw() and _endDraw()?");
		}
		const auto& top = mClipStack.top();

		destination.x += top.xOffset;
		destination.y += top.yOffset;
		destination.w = source.w;
		destination.h = source.h;

		SDL_RenderCopy(mRenderTarget, texture, &source, &destination);
	}

	void SDL2Graphics::saveRenderColor()
	{
		SDL_GetRenderDrawColor(mRenderTarget, &r, &g, &b, &a);
	}

	void SDL2Graphics::restoreRenderColor()
	{
		SDL_SetRenderDrawColor(mRenderTarget, r, g, b, a);
	}
}