commit 94bbccc36322168a596369c8341dad938c8f949f
author Alex Sakhartchouk <alexst@google.com> Tue Aug 17 11:09:49 2010 -0700
committer Alex Sakhartchouk <alexst@google.com> Tue Aug 17 11:09:49 2010 -0700
tree c785190c159c0dfd7e1b031c1bc3a7d492d329ff
parent 0c316eeb437a0ac1d6840690be643d1a553f0b23

Propagating some useful font changes.

Change-Id: Ia3b31a0fa0c59c5edbd3edaca164ca85e090e708

libs/rs/rsFont.cpp

diff --git a/libs/rs/rsFont.cpp b/libs/rs/rsFont.cpp
index 833bee0..1ef9c93 100644
--- a/libs/rs/rsFont.cpp
+++ b/libs/rs/rsFont.cpp
@@ -130,15 +130,7 @@
         // Move to the next character in the array
         index = nextIndex;
 
-        CachedGlyphInfo *cachedGlyph = mCachedGlyphs.valueFor((uint32_t)utfChar);
-
-        if(cachedGlyph == NULL) {
-            cachedGlyph = cacheGlyph((uint32_t)utfChar);
-        }
-        // Is the glyph still in texture cache?
-        if(!cachedGlyph->mIsValid) {
-            updateGlyphCache(cachedGlyph);
-        }
+        CachedGlyphInfo *cachedGlyph = getCachedUTFChar(utfChar);
 
         // If it's still not valid, we couldn't cache it, so we shouldn't draw garbage
         if(cachedGlyph->mIsValid) {
@@ -154,6 +146,20 @@
     }
 }
 
+Font::CachedGlyphInfo* Font::getCachedUTFChar(int32_t utfChar) {
+
+    CachedGlyphInfo *cachedGlyph = mCachedGlyphs.valueFor((uint32_t)utfChar);
+    if(cachedGlyph == NULL) {
+        cachedGlyph = cacheGlyph((uint32_t)utfChar);
+    }
+    // Is the glyph still in texture cache?
+    if(!cachedGlyph->mIsValid) {
+        updateGlyphCache(cachedGlyph);
+    }
+
+    return cachedGlyph;
+}
+
 void Font::updateGlyphCache(CachedGlyphInfo *glyph)
 {
     FT_Error error = FT_Load_Glyph( mFace, glyph->mGlyphIndex, FT_LOAD_RENDER );
@@ -225,6 +231,7 @@
     bool isInitialized = newFont->init(name, fontSize, dpi);
     if(isInitialized) {
         activeFonts.push(newFont);
+        rsc->mStateFont.precacheLatin(newFont);
         return newFont;
     }
 
@@ -422,6 +429,8 @@
     nextLine += mCacheLines.top()->mMaxHeight;
     mCacheLines.push(new CacheTextureLine(24, texType->getDimX(), nextLine, 0));
     nextLine += mCacheLines.top()->mMaxHeight;
+    mCacheLines.push(new CacheTextureLine(24, texType->getDimX(), nextLine, 0));
+    nextLine += mCacheLines.top()->mMaxHeight;
     mCacheLines.push(new CacheTextureLine(32, texType->getDimX(), nextLine, 0));
     nextLine += mCacheLines.top()->mMaxHeight;
     mCacheLines.push(new CacheTextureLine(32, texType->getDimX(), nextLine, 0));
@@ -611,12 +620,33 @@
     }
 }
 
+uint32_t FontState::getRemainingCacheCapacity() {
+    uint32_t remainingCapacity = 0;
+    float totalPixels = 0;
+    for(uint32_t i = 0; i < mCacheLines.size(); i ++) {
+         remainingCapacity += (mCacheLines[i]->mMaxWidth - mCacheLines[i]->mCurrentCol);
+         totalPixels += mCacheLines[i]->mMaxWidth;
+    }
+    remainingCapacity = (remainingCapacity * 100) / totalPixels;
+    return remainingCapacity;
+}
+
+void FontState::precacheLatin(Font *font) {
+    // Remaining capacity is measured in %
+    uint32_t remainingCapacity = getRemainingCacheCapacity();
+    uint32_t precacheIdx = 0;
+    while(remainingCapacity > 25 && precacheIdx < mLatinPrecache.size()) {
+        font->getCachedUTFChar((int32_t)mLatinPrecache[precacheIdx]);
+        remainingCapacity = getRemainingCacheCapacity();
+        precacheIdx ++;
+    }
+}
+
+
 void FontState::renderText(const char *text, uint32_t len, uint32_t startIndex, int numGlyphs, int x, int y)
 {
     checkInit();
 
-    //String8 text8(text);
-
     // Render code here
     Font *currentFont = mRSC->getFont();
     if(!currentFont) {
@@ -636,6 +666,12 @@
         issueDrawCommand();
         mCurrentQuadIndex = 0;
     }
+
+    // We store a string with letters in a rough frequency of occurrence
+    mLatinPrecache = String8(" eisarntolcdugpmhbyfvkwzxjq");
+    mLatinPrecache += String8("EISARNTOLCDUGPMHBYFVKWZXJQ");
+    mLatinPrecache += String8(",.?!()-+@;:`'");
+    mLatinPrecache += String8("0123456789");
 }
 
 void FontState::renderText(const char *text, int x, int y)

libs/rs/rsFont.h

diff --git a/libs/rs/rsFont.h b/libs/rs/rsFont.h
index ab229be..defe38b 100644
--- a/libs/rs/rsFont.h
+++ b/libs/rs/rsFont.h
@@ -93,6 +93,7 @@
     bool mHasKerning;
 
     DefaultKeyedVector<uint32_t, CachedGlyphInfo* > mCachedGlyphs;
+    CachedGlyphInfo* getCachedUTFChar(int32_t utfChar);
 
     CachedGlyphInfo *cacheGlyph(uint32_t glyph);
     void updateGlyphCache(CachedGlyphInfo *glyph);
@@ -129,9 +130,11 @@
         uint32_t mMaxWidth;
         uint32_t mCurrentRow;
         uint32_t mCurrentCol;
+        bool mDirty;
 
         CacheTextureLine(uint32_t maxHeight, uint32_t maxWidth, uint32_t currentRow, uint32_t currentCol) :
-            mMaxHeight(maxHeight), mMaxWidth(maxWidth), mCurrentRow(currentRow), mCurrentCol(currentCol) {
+            mMaxHeight(maxHeight), mMaxWidth(maxWidth), mCurrentRow(currentRow), mCurrentCol(currentCol),
+            mDirty(false)  {
         }
 
         bool fitBitmap(FT_Bitmap *bitmap, uint32_t *retOriginX, uint32_t *retOriginY) {
@@ -143,6 +146,7 @@
                *retOriginX = mCurrentCol;
                *retOriginY = mCurrentRow;
                mCurrentCol += bitmap->width;
+               mDirty = true;
                return true;
             }
 
@@ -151,6 +155,10 @@
     };
 
     Vector<CacheTextureLine*> mCacheLines;
+    uint32_t getRemainingCacheCapacity();
+
+    void precacheLatin(Font *font);
+    String8 mLatinPrecache;
 
     Context *mRSC;