jdd_opendingux/source/common/texture.cpp

#include "texture.h"
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
#include <iostream>
#include "systempalette.h"
#include "destsurface.h"

// Constructor
Texture::Texture(SDL_Renderer *renderer, std::string path, bool verbose)
{
	// Copia punteros
	this->renderer = renderer;
	this->path = path;

	// Inicializa
	this->pixels = nullptr;
	this->width = 0;
	this->height = 0;
	this->color = 0xffffffff;

	// Carga el fichero en la textura
	if (path != "")
	{
		loadFromFile(path, verbose);
	}
}

// Destructor
Texture::~Texture()
{
	// Libera memoria
	unload();
}

// Carga una imagen desde un fichero
bool Texture::loadFromFile(std::string path, bool verbose)
{
	const std::string filename = path.substr(path.find_last_of("\\/") + 1);
	int req_format = STBI_rgb_alpha;
	int width, height, orig_format;
	unsigned char *data = stbi_load(path.c_str(), &width, &height, &orig_format, req_format);
	if (data == nullptr)
	{
		SDL_Log("Loading image failed: %s", stbi_failure_reason());
		exit(1);
	}
	else
	{
		if (verbose)
		{
			std::cout << "Image loaded: " << filename.c_str() << std::endl;
		}
	}

	// Limpia
	unload();

	this->width = width;
	this->height = height;
	const int size = width*height;
	this->pixels = new uint8_t[size];
	for (int i = 0; i < size; ++i) this->pixels[i] = SystemPalette::getEntry(data[i]);

	// Return success
	stbi_image_free(data);
	return this->pixels != nullptr;
}

// Crea una textura en blanco
bool Texture::createBlank(SDL_Renderer *renderer, int width, int height, SDL_TextureAccess access)
{
	// Crea una textura sin inicializar
	this->pixels = new uint8_t[width*height];
	this->width = width;
	this->height = height;

	return this->pixels != nullptr;
}

// Libera la memoria de la textura
void Texture::unload()
{
	// Libera la textura si existe
	if (pixels != nullptr)
	{
		delete[] pixels;
		pixels = nullptr;
		width = 0;
		height = 0;
	}
}

// Establece el color para la modulacion
void Texture::setColor(Uint8 red, Uint8 green, Uint8 blue)
{
	this->color = (red << 24) + (green << 16) + (blue << 8) + 255;
}

// Establece el blending
void Texture::setBlendMode(SDL_BlendMode blending)
{
	//SDL_SetTextureBlendMode(texture, blending);
}

// Establece el alpha para la modulación
void Texture::setAlpha(Uint8 alpha)
{
	//SDL_SetTextureAlphaMod(texture, alpha);
}

// Renderiza la textura en un punto específico
void Texture::render(SDL_Renderer *renderer, int x, int y, SDL_Rect *clip, float zoomW, float zoomH, double angle, SDL_Point *center, SDL_RendererFlip flip)
{
	// Establece el destino de renderizado en la pantalla
	SDL_Rect renderQuad = {x, y, width, height};

	// Obtiene las dimesiones del clip de renderizado
	if (clip != nullptr)
	{
		renderQuad.w = clip->w;
		renderQuad.h = clip->h;
	}

	renderQuad.w = renderQuad.w * zoomW;
	renderQuad.h = renderQuad.h * zoomH;

	// Renderiza a pantalla
	//SDL_RenderCopyEx(renderer, texture, clip, &renderQuad, angle, center, flip);

	uint8_t *destSurface = DestSurface::getPixels();
	int canvasWidth = DestSurface::getWidth();

	int y_inc = 1, y_ini = 0, y_fin = renderQuad.h-1; if (flip && SDL_FLIP_VERTICAL==SDL_FLIP_VERTICAL) { auto tmp=y_ini; y_ini=y_fin; y_fin=tmp; y_inc=-1; }
	int x_inc = 1, x_ini = 0, x_fin = renderQuad.w-1; if (flip && SDL_FLIP_HORIZONTAL==SDL_FLIP_HORIZONTAL) { auto tmp=x_ini; x_ini=x_fin; x_fin=tmp; x_inc=-1; }
	for (int yy=y_ini; yy <= y_fin; yy += y_inc) {
		for (int xx=x_ini; xx <= x_fin; xx += x_inc) {
			destSurface[ x+xx + y+yy * canvasWidth ] = pixels[ clip->x+xx + clip->y+yy * width ];
		}
	}
}

// Establece la textura como objetivo de renderizado
void Texture::setAsRenderTarget(SDL_Renderer *renderer)
{
	//SDL_SetRenderTarget(renderer, texture);
}

// Obtiene el ancho de la imagen
int Texture::getWidth()
{
	return width;
}

// Obtiene el alto de la imagen
int Texture::getHeight()
{
	return height;
}

// Recarga la textura
bool Texture::reLoad()
{
	return loadFromFile(path, renderer);
}

// Obtiene la textura
SDL_Texture *Texture::getSDLTexture()
{
	return nullptr; //texture;
}