shape.cpp File Reference

#include "modules/skplaintexteditor/src/shape.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontMetrics.h"
#include "include/core/SkFontMgr.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkString.h"
#include "include/core/SkTextBlob.h"
#include "include/core/SkTypes.h"
#include "include/private/base/SkTFitsIn.h"
#include "modules/skplaintexteditor/src/word_boundaries.h"
#include "modules/skshaper/include/SkShaper.h"
#include "src/base/SkUTF.h"
#include "src/core/SkTextBlobPriv.h"
#include <cfloat>
#include <climits>
#include <cstring>

Go to the source code of this file.

Functions
static SkRect	selection_box (const SkFontMetrics &metrics, float advance, SkPoint pos)
static void	set_character_bounds (void *context, const char *utf8Text, size_t utf8TextBytes, size_t glyphCount, const SkGlyphID *glyphs, const SkPoint *positions, const uint32_t *clusters, const SkFont &font)

Function Documentation

selection_box()

static SkRect selection_box ( const SkFontMetrics &  metrics, float  advance, SkPoint  pos  )

static

Definition at line 213 of file shape.cpp.

                                         {
    if (fabsf(advance) < 1.0f) {
        advance = copysignf(1.0f, advance);
    }
    return SkRect{pos.x(),
                  pos.y() + metrics.fAscent,
                  pos.x() + advance,
                  pos.y() + metrics.fDescent}.makeSorted();
}

set_character_bounds()

static void set_character_bounds ( void *  context, const char *  utf8Text, size_t  utf8TextBytes, size_t  glyphCount, const SkGlyphID *  glyphs, const SkPoint *  positions, const uint32_t *  clusters, const SkFont &  font  )

static

Definition at line 225 of file shape.cpp.

{
    SkASSERT(context);
    SkASSERT(glyphCount > 0);
    SkRect* cursors = (SkRect*)context;
 
    SkFontMetrics metrics;
    font.getMetrics(&metrics);
    std::unique_ptr<float[]> advances(new float[glyphCount]);
    font.getWidths(glyphs, glyphCount, advances.get());
 
    // Loop over each cluster in this run.
    size_t clusterStart = 0;
    for (size_t glyphIndex = 0; glyphIndex < glyphCount; ++glyphIndex) {
        if (glyphIndex + 1 < glyphCount  // more glyphs
            && clusters[glyphIndex] == clusters[glyphIndex + 1]) {
            continue; // multi-glyph cluster
        }
        unsigned textBegin = clusters[glyphIndex];
        unsigned textEnd = utf8TextBytes;
        for (size_t i = 0; i < glyphCount; ++i) {
            if (clusters[i] >= textEnd) {
                textEnd = clusters[i] + 1;
            }
        }
        for (size_t i = 0; i < glyphCount; ++i) {
            if (clusters[i] > textBegin && clusters[i] < textEnd) {
                textEnd = clusters[i];
                if (textEnd == textBegin + 1) { break; }
            }
        }
        SkASSERT(glyphIndex + 1 > clusterStart);
        unsigned clusterGlyphCount = glyphIndex + 1 - clusterStart;
        const SkPoint* clusterGlyphPositions = &positions[clusterStart];
        const float* clusterAdvances = &advances[clusterStart];
        clusterStart = glyphIndex + 1;  // for next loop
 
        SkRect clusterBox = selection_box(metrics, clusterAdvances[0], clusterGlyphPositions[0]);
        for (unsigned i = 1; i < clusterGlyphCount; ++i) { // multiple glyphs
            clusterBox.join(selection_box(metrics, clusterAdvances[i], clusterGlyphPositions[i]));
        }
        if (textBegin + 1 == textEnd) {  // single byte, fast path.
            cursors[textBegin] = clusterBox;
            continue;
        }
        int textCount = textEnd - textBegin;
        int codePointCount = SkUTF::CountUTF8(utf8Text + textBegin, textCount);
        if (codePointCount == 1) {  // single codepoint, fast path.
            cursors[textBegin] = clusterBox;
            continue;
        }
 
        float width = clusterBox.width() / codePointCount;
        SkASSERT(width > 0);
        const char* ptr = utf8Text + textBegin;
        const char* end = utf8Text + textEnd;
        float x = clusterBox.left();
        while (ptr < end) {  // for each codepoint in cluster
            const char* nextPtr = ptr;
            SkUTF::NextUTF8(&nextPtr, end);
            int firstIndex = ptr - utf8Text;
            float nextX = x + width;
            cursors[firstIndex] = SkRect{x, clusterBox.top(), nextX, clusterBox.bottom()};
            x = nextX;
            ptr = nextPtr;
        }
    }
}