diff options
author | Johannes Schickel | 2014-06-09 18:54:49 +0200 |
---|---|---|
committer | Johannes Schickel | 2014-09-03 22:55:48 +0200 |
commit | d55cd8f3b44de42d9be09280634584b6424945f9 (patch) | |
tree | 3f4b89405c8d4dd8e34f46382ebb2f13d4dfd998 /graphics/font.cpp | |
parent | 58bfb3b43588152490efc55c24ca8c94e8f39e38 (diff) | |
download | scummvm-rg350-d55cd8f3b44de42d9be09280634584b6424945f9.tar.gz scummvm-rg350-d55cd8f3b44de42d9be09280634584b6424945f9.tar.bz2 scummvm-rg350-d55cd8f3b44de42d9be09280634584b6424945f9.zip |
GRAPHICS: Allow to query the bounding box of chars/strings drawn with Font API.
Diffstat (limited to 'graphics/font.cpp')
-rw-r--r-- | graphics/font.cpp | 131 |
1 files changed, 108 insertions, 23 deletions
diff --git a/graphics/font.cpp b/graphics/font.cpp index 1ed67fa169..dba48249bc 100644 --- a/graphics/font.cpp +++ b/graphics/font.cpp @@ -31,9 +31,54 @@ int Font::getKerningOffset(uint32 left, uint32 right) const { return 0; } +Common::Rect Font::getBoundingBox(uint32 chr) const { + return Common::Rect(getCharWidth(chr), getFontHeight()); +} + namespace { template<class StringType> +Common::Rect getBoundingBoxImpl(const Font &font, const StringType &str, int x, int y, int w, TextAlign align, int deltax) { + // We follow the logic of drawStringImpl here. The only exception is + // that we do allow an empty width to be specified here. This allows us + // to obtain the complete bounding box of a string. + const int leftX = x, rightX = w ? (x + w) : 0x7FFFFFFF; + int width = font.getStringWidth(str); + + if (align == kTextAlignCenter) + x = x + (w - width)/2; + else if (align == kTextAlignRight) + x = x + w - width; + x += deltax; + + bool first = true; + Common::Rect bbox; + + typename StringType::unsigned_type last = 0; + for (typename StringType::const_iterator i = str.begin(), end = str.end(); i != end; ++i) { + const typename StringType::unsigned_type cur = *i; + x += font.getKerningOffset(last, cur); + last = cur; + w = font.getCharWidth(cur); + if (x+w > rightX) + break; + if (x+w >= leftX) { + Common::Rect charBox = font.getBoundingBox(cur); + charBox.translate(x, y); + if (first) { + bbox = charBox; + first = false; + } else { + bbox.extend(charBox); + } + } + x += w; + } + + return bbox; +} + +template<class StringType> int getStringWidthImpl(const Font &font, const StringType &str) { int space = 0; typename StringType::unsigned_type last = 0; @@ -49,6 +94,8 @@ int getStringWidthImpl(const Font &font, const StringType &str) { template<class StringType> void drawStringImpl(const Font &font, Surface *dst, const StringType &str, int x, int y, int w, uint32 color, TextAlign align, int deltax) { + // The logic in getBoundingImpl is the same as we use here. In case we + // ever change something here we will need to change it there too. assert(dst != 0); const int leftX = x, rightX = x + w; @@ -175,6 +222,40 @@ int wordWrapTextImpl(const Font &font, const StringType &str, int maxWidth, Comm } // End of anonymous namespace +Common::Rect Font::getBoundingBox(const Common::String &input, int x, int y, const int w, TextAlign align, int deltax, bool useEllipsis) const { + // In case no width was given we cannot use ellipsis or any alignment + // apart from left alignment. + if (w == 0) { + if (useEllipsis) { + warning("Font::getBoundingBox: Requested ellipsis when no width was specified"); + } + + if (align != kTextAlignLeft) { + warning("Font::getBoundingBox: Requested text alignment when no width was specified"); + } + + useEllipsis = false; + align = kTextAlignLeft; + } + + const Common::String str = useEllipsis ? handleEllipsis(input, w) : input; + return getBoundingBoxImpl(*this, str, x, y, w, align, deltax); +} + +Common::Rect Font::getBoundingBox(const Common::U32String &str, int x, int y, const int w, TextAlign align) const { + // In case no width was given we cannot any alignment apart from left + // alignment. + if (w == 0) { + if (align != kTextAlignLeft) { + warning("Font::getBoundingBox: Requested text alignment when no width was specified"); + } + + align = kTextAlignLeft; + } + + return getBoundingBoxImpl(*this, str, x, y, w, align, 0); +} + int Font::getStringWidth(const Common::String &str) const { return getStringWidthImpl(*this, str); } @@ -183,12 +264,28 @@ int Font::getStringWidth(const Common::U32String &str) const { return getStringWidthImpl(*this, str); } -void Font::drawString(Surface *dst, const Common::String &sOld, int x, int y, int w, uint32 color, TextAlign align, int deltax, bool useEllipsis) const { - Common::String s = sOld; +void Font::drawString(Surface *dst, const Common::String &str, int x, int y, int w, uint32 color, TextAlign align, int deltax, bool useEllipsis) const { + Common::String renderStr = useEllipsis ? handleEllipsis(str, w) : str; + drawStringImpl(*this, dst, renderStr, x, y, w, color, align, deltax); +} + +void Font::drawString(Surface *dst, const Common::U32String &str, int x, int y, int w, uint32 color, TextAlign align) const { + drawStringImpl(*this, dst, str, x, y, w, color, align, 0); +} + +int Font::wordWrapText(const Common::String &str, int maxWidth, Common::Array<Common::String> &lines) const { + return wordWrapTextImpl(*this, str, maxWidth, lines); +} + +int Font::wordWrapText(const Common::U32String &str, int maxWidth, Common::Array<Common::U32String> &lines) const { + return wordWrapTextImpl(*this, str, maxWidth, lines); +} + +Common::String Font::handleEllipsis(const Common::String &input, int w) const { + Common::String s = input; int width = getStringWidth(s); - Common::String str; - if (useEllipsis && width > w && s.hasSuffix("...")) { + if (width > w && s.hasSuffix("...")) { // String is too wide. Check whether it ends in an ellipsis // ("..."). If so, remove that and try again! s.deleteLastChar(); @@ -197,7 +294,9 @@ void Font::drawString(Surface *dst, const Common::String &sOld, int x, int y, in width = getStringWidth(s); } - if (useEllipsis && width > w) { + if (width > w) { + Common::String str; + // String is too wide. So we shorten it "intelligently" by // replacing parts of the string by an ellipsis. There are // three possibilities for this: replace the start, the end, or @@ -212,9 +311,9 @@ void Font::drawString(Surface *dst, const Common::String &sOld, int x, int y, in const int halfWidth = (w - ellipsisWidth) / 2; int w2 = 0; Common::String::unsigned_type last = 0; - uint i; + uint i = 0; - for (i = 0; i < s.size(); ++i) { + for (; i < s.size(); ++i) { const Common::String::unsigned_type cur = s[i]; int charWidth = getCharWidth(cur) + getKerningOffset(last, cur); if (w2 + charWidth > halfWidth) @@ -247,24 +346,10 @@ void Font::drawString(Surface *dst, const Common::String &sOld, int x, int y, in str += s[i]; } - width = getStringWidth(str); + return str; } else { - str = s; + return s; } - - drawStringImpl(*this, dst, str, x, y, w, color, align, deltax); -} - -void Font::drawString(Surface *dst, const Common::U32String &str, int x, int y, int w, uint32 color, TextAlign align) const { - drawStringImpl(*this, dst, str, x, y, w, color, align, 0); -} - -int Font::wordWrapText(const Common::String &str, int maxWidth, Common::Array<Common::String> &lines) const { - return wordWrapTextImpl(*this, str, maxWidth, lines); -} - -int Font::wordWrapText(const Common::U32String &str, int maxWidth, Common::Array<Common::U32String> &lines) const { - return wordWrapTextImpl(*this, str, maxWidth, lines); } } // End of namespace Graphics |