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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef GRAPHICS_FONT_H
#define GRAPHICS_FONT_H
#include "common/str.h"
#include "common/ustr.h"
#include "common/rect.h"
namespace Common {
template<class T> class Array;
}
namespace Graphics {
struct Surface;
class ManagedSurface;
/** Text alignment modes */
enum TextAlign {
kTextAlignInvalid,
kTextAlignLeft, ///< Text should be aligned to the left
kTextAlignCenter, ///< Text should be centered
kTextAlignRight ///< Text should be aligned to the right
};
/**
* Instances of this class represent a distinct font, with a built-in renderer.
* @todo Maybe move the high-level methods (drawString etc.) to a separate
* FontRenderer class? That way, we could have different variants... ?
*/
class Font {
public:
Font() {}
virtual ~Font() {}
/**
* Query the height of the font.
*
* @return font height.
*/
virtual int getFontHeight() const = 0;
/**
* Query the maximum width of the font.
*
* @return maximum font width.
*/
virtual int getMaxCharWidth() const = 0;
/**
* Query the width of a specific character.
*
* @param chr The character to query the width of.
* @return The character's width.
*/
virtual int getCharWidth(uint32 chr) const = 0;
/**
* Query the kerning offset between two characters.
*
* @param left The left character. May be 0.
* @param right The right character. May be 0.
* @return The horizontal displacement.
*/
virtual int getKerningOffset(uint32 left, uint32 right) const;
/**
* Calculate the bounding box of a character. It is assumed that
* the character shall be drawn at position (0, 0).
*
* The idea here is that the character might be drawn outside the
* rect (0, 0) to (getCharWidth(chr), getFontHeight()) for some fonts.
* This is common among TTF fonts.
*
* The default implementation simply returns the rect with a width
* of getCharWidth(chr) and height of getFontHeight().
*
* @param chr The character to draw.
* @return The bounding box of the drawn glyph.
*/
virtual Common::Rect getBoundingBox(uint32 chr) const;
/**
* Return the bounding box of a string drawn with drawString.
*
* @param x The x position where to start drawing
* @param y The y position where to start drawing
* @param w The width of the text area. This can be 0 to allow for
* obtaining the whole bounding box for a string. Note that this
* does not work with an align different from kTextAlignLeft or
* with useEllipsis.
* @param align The text alignment. This can be used to center a string
* in the given area or to align it to the right.
* @param delatx Offset to the x starting position of the string.
* @param useEllipsis Try to fit the string in the area by inserting an
* ellipsis. Be ware that the default is false for this
* one unlike for drawString!
* @return The actual area where the string is drawn.
*/
Common::Rect getBoundingBox(const Common::String &str, int x = 0, int y = 0, const int w = 0, TextAlign align = kTextAlignLeft, int deltax = 0, bool useEllipsis = false) const;
Common::Rect getBoundingBox(const Common::U32String &str, int x = 0, int y = 0, const int w = 0, TextAlign align = kTextAlignLeft) const;
/**
* Draw a character at a specific point on a surface.
*
* Note that the point describes the top left edge point where to draw
* the character. This can be different from top left edge point of the
* character's bounding box! For example, TTF fonts sometimes move
* characters like 't' one (or more) pixels to the left to create better
* visual results. To query the actual bounding box of a character use
* getBoundingBox.
* @see getBoundingBox
*
* The Font implemenation should take care of not drawing outside of the
* specified surface.
*
* @param dst The surface to drawn on.
* @param chr The character to draw.
* @param x The x coordinate where to draw the character.
* @param y The y coordinate where to draw the character.
* @param color The color of the character.
*/
virtual void drawChar(Surface *dst, uint32 chr, int x, int y, uint32 color) const = 0;
void drawChar(ManagedSurface *dst, uint32 chr, int x, int y, uint32 color) const;
// TODO: Add doxygen comments to this
void drawString(Surface *dst, const Common::String &str, int x, int y, int w, uint32 color, TextAlign align = kTextAlignLeft, int deltax = 0, bool useEllipsis = true) const;
void drawString(Surface *dst, const Common::U32String &str, int x, int y, int w, uint32 color, TextAlign align = kTextAlignLeft) const;
void drawString(ManagedSurface *dst, const Common::String &str, int x, int y, int w, uint32 color, TextAlign align = kTextAlignLeft, int deltax = 0, bool useEllipsis = true) const;
void drawString(ManagedSurface *dst, const Common::U32String &str, int x, int y, int w, uint32 color, TextAlign align = kTextAlignLeft) const;
/**
* Compute and return the width the string str has when rendered using this font.
* This describes the logical width of the string when drawn at (0, 0).
* This can be different from the actual bounding box of the string. Use
* getBoundingBox when you need the bounding box of a drawn string.
* @see getBoundingBox
* @see drawChar
*/
int getStringWidth(const Common::String &str) const;
int getStringWidth(const Common::U32String &str) const;
/**
* Take a text (which may contain newline characters) and word wrap it so that
* no text line is wider than maxWidth pixels. If necessary, additional line breaks
* are generated, preferably between words (i.e. where whitespaces are).
* The resulting lines are appended to the lines string list.
* It returns the maximal width of any of the new lines (i.e. a value which is less
* or equal to maxWidth).
*
* @param str the string to word wrap
* @param maxWidth the maximum width a line may have
* @param lines the string list to which the text lines from str are appended
* @return the maximal width of any of the lines added to lines
*/
int wordWrapText(const Common::String &str, int maxWidth, Common::Array<Common::String> &lines) const;
int wordWrapText(const Common::U32String &str, int maxWidth, Common::Array<Common::U32String> &lines) const;
private:
Common::String handleEllipsis(const Common::String &str, int w) const;
};
} // End of namespace Graphics
#endif
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