imported Löve GLES branch (changeset 1ba9037e558b)

2026-08-21 05:00:22 +02:00 · 2013-12-05 18:05:13 +01:00
parent 41b2db04a7
commit 2644d1ee18
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+/**
+ * Copyright (c) 2006-2013 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.
+ **/
+
+#ifndef LOVE_GRAPHICS_OPENGL_FONT_H
+#define LOVE_GRAPHICS_OPENGL_FONT_H
+
+// STD
+#include <map>
+#include <string>
+#include <vector>
+
+// LOVE
+#include "common/Object.h"
+#include "font/Rasterizer.h"
+#include "graphics/Image.h"
+
+#include "OpenGL.h"
+
+namespace love
+{
+namespace graphics
+{
+namespace opengl
+{
+
+class Font : public Object, public Volatile
+{
+public:
+
+	Font(love::font::Rasterizer *r, const Image::Filter &filter = Image::getDefaultFilter());
+
+	virtual ~Font();
+
+	/**
+	 * Prints the text at the designated position with rotation and scaling.
+	 *
+	 * @param text A string.
+	 * @param x The x-coordinate.
+	 * @param y The y-coordinate.
+	 * @param extra_spacing Additional spacing added to spaces (" ").
+	 * @param angle The amount of rotation.
+	 * @param sx Scale along the x axis.
+	 * @param sy Scale along the y axis.
+	 * @param ox The origin offset along the x-axis.
+	 * @param oy The origin offset along the y-axis.
+	 * @param kx Shear along the x axis.
+	 * @param ky Shear along the y axis.
+	 **/
+	void print(const std::string &text, float x, float y, float extra_spacing = 0.0f, float angle = 0.0f, float sx = 1.0f, float sy = 1.0f, float ox = 0.0f, float oy = 0.0f, float kx = 0.0f, float ky = 0.0f);
+
+	/**
+	 * Returns the height of the font.
+	 **/
+	float getHeight() const;
+
+	/**
+	 * Returns the width of the passed string.
+	 *
+	 * @param str A string of text.
+	 **/
+	int getWidth(const std::string &str);
+
+	/**
+	 * Returns the width of the passed character.
+	 *
+	 * @param character A character.
+	 **/
+	int getWidth(char character);
+
+	/**
+	 * Returns the maximal width of a wrapped string
+	 * and optionally the number of lines
+	 *
+	 * @param text The input text
+	 * @param wrap The number of pixels to wrap at
+	 * @param max_width Optional output of the maximum width
+	 * @param wrapped_lines Optional output indicating which lines were
+	 *        auto-wrapped. Indices correspond to indices of the returned value.
+	 * Returns a vector with the lines.
+	 **/
+	std::vector<std::string> getWrap(const std::string &text, float wrap, int *max_width = 0, std::vector<bool> *wrapped_lines = 0);
+
+	/**
+	 * Sets the line height (which should be a number to multiply the font size by,
+	 * example: line height = 1.2 and size = 12 means that rendered line height = 12*1.2)
+	 * @param height The new line height.
+	 **/
+	void setLineHeight(float height);
+
+	/**
+	 * Returns the line height.
+	 **/
+	float getLineHeight() const;
+
+	/**
+	 * Sets the spacing modifier (changes the spacing between the characters the
+	 * same way that the line height does [multiplication]).
+	 * Note: The spacing must be set BEFORE the font is loaded to have any effect.
+	 * @param amount The amount of modification.
+	 **/
+	void setSpacing(float amount);
+
+	/**
+	 * Returns the spacing modifier.
+	 **/
+	float getSpacing() const;
+
+	void setFilter(const Image::Filter &f);
+	const Image::Filter &getFilter();
+
+	// Implements Volatile.
+	bool loadVolatile();
+	void unloadVolatile();
+
+	// Extra font metrics
+	int getAscent() const;
+	int getDescent() const;
+	float getBaseline() const;
+
+	bool hasGlyph(uint32 glyph) const;
+	bool hasGlyphs(const std::string &text) const;
+
+private:
+
+	enum FontType
+	{
+		FONT_TRUETYPE = 1,
+		FONT_IMAGE,
+		FONT_UNKNOWN
+	};
+
+	struct GlyphVertex
+	{
+		float x, y;
+		float s, t;
+	};
+
+	struct Glyph
+	{
+		GLuint texture;
+		int spacing;
+		GlyphVertex vertices[4];
+	};
+
+	// used to determine when to change textures in the vertex array generated when printing text
+	struct GlyphArrayDrawInfo
+	{
+		GLuint texture;
+		int startvertex;
+		int vertexcount;
+
+		// used when sorting with std::sort
+		// sorts by texture first (binding textures is expensive) and relative position in memory second
+		bool operator < (const GlyphArrayDrawInfo &other) const
+		{
+			if (texture != other.texture)
+				return texture < other.texture;
+			else
+				return startvertex < other.startvertex;
+		};
+	};
+
+	bool initializeTexture(GLint format);
+	void createTexture();
+	Glyph *addGlyph(uint32 glyph);
+	Glyph *findGlyph(uint32 glyph);
+
+	love::font::Rasterizer *rasterizer;
+
+	int height;
+	float lineHeight;
+	float mSpacing; // modifies the spacing by multiplying it with this value
+
+	int textureSizeIndex;
+	int textureWidth;
+	int textureHeight;
+
+	// vector of packed textures
+	std::vector<GLuint> textures;
+
+	// maps glyphs to glyph texture information
+	std::map<uint32, Glyph *> glyphs;
+
+	FontType type;
+	Image::Filter filter;
+
+	static const int NUM_TEXTURE_SIZES = 7;
+	static const int TEXTURE_WIDTHS[NUM_TEXTURE_SIZES];
+	static const int TEXTURE_HEIGHTS[NUM_TEXTURE_SIZES];
+
+	static const int TEXTURE_PADDING = 1;
+
+	int textureX, textureY;
+	int rowHeight;
+
+}; // Font
+
+} // opengl
+} // graphics
+} // love
+
+#endif // LOVE_GRAPHICS_OPENGL_FONT_H