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