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authorMichael Lutz <michi@icosahedron.de>2018-04-29 16:43:30 +0200
committerMichael Lutz <michi@icosahedron.de>2018-06-06 21:37:09 +0200
commita4278c302b7721d22e4501315b5a1713f5471163 (patch)
treeace01b07c9b9107caf2b0b2d3acaa1199c5d00f1 /src
parentf4394debdc092487d603f95716a026a5c8834f8c (diff)
downloadopenttd-a4278c302b7721d22e4501315b5a1713f5471163.tar.xz
Codechange: Move ParagraphLayouter-specific functions into factory classes instead of relying on overloads.
Diffstat (limited to 'src')
-rw-r--r--src/gfx_layout.cpp157
1 files changed, 84 insertions, 73 deletions
diff --git a/src/gfx_layout.cpp b/src/gfx_layout.cpp
index 3290aea65..53de0e768 100644
--- a/src/gfx_layout.cpp
+++ b/src/gfx_layout.cpp
@@ -113,26 +113,12 @@ le_bool Font::getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &poin
return FALSE;
}
-static size_t AppendToBuffer(UChar *buff, const UChar *buffer_last, WChar c)
-{
- /* Transform from UTF-32 to internal ICU format of UTF-16. */
- int32 length = 0;
- UErrorCode err = U_ZERO_ERROR;
- u_strFromUTF32(buff, buffer_last - buff, &length, (UChar32*)&c, 1, &err);
- return length;
-}
-
/**
* Wrapper for doing layouts with ICU.
*/
class ICUParagraphLayout : public AutoDeleteSmallVector<ParagraphLayouter::Line *, 4>, public ParagraphLayouter {
ParagraphLayout *p; ///< The actual ICU paragraph layout.
public:
- /** Helper for GetLayouter, to get the right type. */
- typedef UChar CharType;
- /** Helper for GetLayouter, to get whether the layouter supports RTL. */
- static const bool SUPPORTS_RTL = true;
-
/** Visual run contains data about the bit of text with the same font. */
class ICUVisualRun : public ParagraphLayouter::VisualRun {
const ParagraphLayout::VisualRun *vr; ///< The actual ICU vr.
@@ -184,35 +170,54 @@ public:
}
};
-static ParagraphLayouter *GetParagraphLayout(UChar *buff, UChar *buff_end, FontMap &fontMapping)
-{
- int32 length = buff_end - buff;
+/**
+ * Helper class to construct a new #ICUParagraphLayout.
+ */
+class ICUParagraphLayoutFactory {
+public:
+ /** Helper for GetLayouter, to get the right type. */
+ typedef UChar CharType;
+ /** Helper for GetLayouter, to get whether the layouter supports RTL. */
+ static const bool SUPPORTS_RTL = true;
- if (length == 0) {
- /* ICU's ParagraphLayout cannot handle empty strings, so fake one. */
- buff[0] = ' ';
- length = 1;
- fontMapping.End()[-1].first++;
- }
+ static ParagraphLayouter *GetParagraphLayout(UChar *buff, UChar *buff_end, FontMap &fontMapping)
+ {
+ int32 length = buff_end - buff;
- /* Fill ICU's FontRuns with the right data. */
- FontRuns runs(fontMapping.Length());
- for (FontMap::iterator iter = fontMapping.Begin(); iter != fontMapping.End(); iter++) {
- runs.add(iter->second, iter->first);
- }
+ if (length == 0) {
+ /* ICU's ParagraphLayout cannot handle empty strings, so fake one. */
+ buff[0] = ' ';
+ length = 1;
+ fontMapping.End()[-1].first++;
+ }
- LEErrorCode status = LE_NO_ERROR;
- /* ParagraphLayout does not copy "buff", so it must stay valid.
- * "runs" is copied according to the ICU source, but the documentation does not specify anything, so this might break somewhen. */
- ParagraphLayout *p = new ParagraphLayout(buff, length, &runs, NULL, NULL, NULL, _current_text_dir == TD_RTL ? UBIDI_DEFAULT_RTL : UBIDI_DEFAULT_LTR, false, status);
- if (status != LE_NO_ERROR) {
- delete p;
- return NULL;
- }
+ /* Fill ICU's FontRuns with the right data. */
+ FontRuns runs(fontMapping.Length());
+ for (FontMap::iterator iter = fontMapping.Begin(); iter != fontMapping.End(); iter++) {
+ runs.add(iter->second, iter->first);
+ }
- return new ICUParagraphLayout(p);
-}
+ LEErrorCode status = LE_NO_ERROR;
+ /* ParagraphLayout does not copy "buff", so it must stay valid.
+ * "runs" is copied according to the ICU source, but the documentation does not specify anything, so this might break somewhen. */
+ ParagraphLayout *p = new ParagraphLayout(buff, length, &runs, NULL, NULL, NULL, _current_text_dir == TD_RTL ? UBIDI_DEFAULT_RTL : UBIDI_DEFAULT_LTR, false, status);
+ if (status != LE_NO_ERROR) {
+ delete p;
+ return NULL;
+ }
+ return new ICUParagraphLayout(p);
+ }
+
+ static size_t AppendToBuffer(UChar *buff, const UChar *buffer_last, WChar c)
+ {
+ /* Transform from UTF-32 to internal ICU format of UTF-16. */
+ int32 length = 0;
+ UErrorCode err = U_ZERO_ERROR;
+ u_strFromUTF32(buff, buffer_last - buff, &length, (UChar32*)&c, 1, &err);
+ return length;
+ }
+};
#endif /* WITH_ICU_LAYOUT */
/*** Paragraph layout ***/
@@ -236,11 +241,6 @@ static ParagraphLayouter *GetParagraphLayout(UChar *buff, UChar *buff_end, FontM
*/
class FallbackParagraphLayout : public ParagraphLayouter {
public:
- /** Helper for GetLayouter, to get the right type. */
- typedef WChar CharType;
- /** Helper for GetLayouter, to get whether the layouter supports RTL. */
- static const bool SUPPORTS_RTL = false;
-
/** Visual run contains data about the bit of text with the same font. */
class FallbackVisualRun : public ParagraphLayouter::VisualRun {
Font *font; ///< The font used to layout these.
@@ -281,6 +281,42 @@ public:
};
/**
+ * Helper class to construct a new #FallbackParagraphLayout.
+ */
+class FallbackParagraphLayoutFactory {
+public:
+ /** Helper for GetLayouter, to get the right type. */
+ typedef WChar CharType;
+ /** Helper for GetLayouter, to get whether the layouter supports RTL. */
+ static const bool SUPPORTS_RTL = false;
+
+ /**
+ * Get the actual ParagraphLayout for the given buffer.
+ * @param buff The begin of the buffer.
+ * @param buff_end The location after the last element in the buffer.
+ * @param fontMapping THe mapping of the fonts.
+ * @return The ParagraphLayout instance.
+ */
+ static ParagraphLayouter *GetParagraphLayout(WChar *buff, WChar *buff_end, FontMap &fontMapping)
+ {
+ return new FallbackParagraphLayout(buff, buff_end - buff, fontMapping);
+ }
+
+ /**
+ * Append a wide character to the internal buffer.
+ * @param buff The buffer to append to.
+ * @param buffer_last The end of the buffer.
+ * @param c The character to add.
+ * @return The number of buffer spaces that were used.
+ */
+ static size_t AppendToBuffer(WChar *buff, const WChar *buffer_last, WChar c)
+ {
+ *buff = c;
+ return 1;
+ }
+};
+
+/**
* Create the visual run.
* @param font The font to use for this run.
* @param chars The characters to use for this run.
@@ -537,31 +573,6 @@ const ParagraphLayouter::Line *FallbackParagraphLayout::NextLine(int max_width)
}
/**
- * Appand a wide character to the internal buffer.
- * @param buff The buffer to append to.
- * @param buffer_last The end of the buffer.
- * @param c The character to add.
- * @return The number of buffer spaces that were used.
- */
-static size_t AppendToBuffer(WChar *buff, const WChar *buffer_last, WChar c)
-{
- *buff = c;
- return 1;
-}
-
-/**
- * Get the actual ParagraphLayout for the given buffer.
- * @param buff The begin of the buffer.
- * @param buff_end The location after the last element in the buffer.
- * @param fontMapping THe mapping of the fonts.
- * @return The ParagraphLayout instance.
- */
-static FallbackParagraphLayout *GetParagraphLayout(WChar *buff, WChar *buff_end, FontMap &fontMapping)
-{
- return new FallbackParagraphLayout(buff, buff_end - buff, fontMapping);
-}
-
-/**
* Helper for getting a ParagraphLayouter of the given type.
*
* @note In case no ParagraphLayouter could be constructed, line.layout will be NULL.
@@ -605,7 +616,7 @@ static inline void GetLayouter(Layouter::LineCacheItem &line, const char *&str,
* will not be handled in the fallback non ICU case because they are
* mostly needed for RTL languages which need more ICU support. */
if (!T::SUPPORTS_RTL && IsTextDirectionChar(c)) continue;
- buff += AppendToBuffer(buff, buffer_last, c);
+ buff += T::AppendToBuffer(buff, buffer_last, c);
continue;
}
@@ -621,7 +632,7 @@ static inline void GetLayouter(Layouter::LineCacheItem &line, const char *&str,
if (!fontMapping.Contains(buff - buff_begin)) {
fontMapping.Insert(buff - buff_begin, f);
}
- line.layout = GetParagraphLayout(buff_begin, buff, fontMapping);
+ line.layout = T::GetParagraphLayout(buff_begin, buff, fontMapping);
line.state_after = state;
}
@@ -658,7 +669,7 @@ Layouter::Layouter(const char *str, int maxw, TextColour colour, FontSize fontsi
FontState old_state = state;
const char *old_str = str;
- GetLayouter<ICUParagraphLayout>(line, str, state);
+ GetLayouter<ICUParagraphLayoutFactory>(line, str, state);
if (line.layout == NULL) {
static bool warned = false;
if (!warned) {
@@ -668,10 +679,10 @@ Layouter::Layouter(const char *str, int maxw, TextColour colour, FontSize fontsi
state = old_state;
str = old_str;
- GetLayouter<FallbackParagraphLayout>(line, str, state);
+ GetLayouter<FallbackParagraphLayoutFactory>(line, str, state);
}
#else
- GetLayouter<FallbackParagraphLayout>(line, str, state);
+ GetLayouter<FallbackParagraphLayoutFactory>(line, str, state);
#endif
}