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Commit 12996283 authored by Roozbeh Pournader's avatar Roozbeh Pournader
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Implement getMinLineWidth for LineWidthDelegate 

Minikin needs getMinLineWidth() implemented for supporting desperate
breaks in optimal line breaking. This CL implements it for
StaticLayout.

Bug: 68058572
Test: bit CtsTextTestCases:android.text.cts.StaticLayoutLineBreakingTest
Change-Id: I56f6a592c688d816c201279d35fad65e36dffd84
parent f8a6f1da

core/jni/android_text_StaticLayout.cpp

+12 −0
Original line number Diff line number Diff line
@@ -67,6 +67,18 @@ class JNILineBreakerLineWidth : public minikin::LineBreaker::LineWidthDelegate { 
            return width - get(mIndents, lineNo);

        }



        float getMinLineWidth() override {

            // A simpler algorithm would have been simply looping until the larger of

            // mFirstLineCount and mIndents.size()-mOffset, but that does unnecessary calculations

            // when mFirstLineCount is large. Instead, we measure the first line, all the lines that

            // have an indent, and the first line after firstWidth ends and restWidth starts.

            float minWidth = std::min(getLineWidth(0), getLineWidth(mFirstLineCount));

            for (size_t lineNo = 1; lineNo + mOffset < mIndents.size(); lineNo++) {

                minWidth = std::min(minWidth, getLineWidth(lineNo));

            }

            return minWidth;

        }



        float getLeftPadding(size_t lineNo) override {

            return get(mLeftPaddings, lineNo);

        }