f3ed273b32
Fixed some bugs for flutter tests Change-Id: I43f4b4b185152a8d642127370da5f80fb96f1e9e Reviewed-on: https://skia-review.googlesource.com/c/skia/+/239444 Commit-Queue: Julia Lavrova <jlavrova@google.com> Reviewed-by: Ben Wagner <bungeman@google.com>
99 lines
3.6 KiB
C++
99 lines
3.6 KiB
C++
// Copyright 2019 Google LLC.
|
|
#ifndef Metrics_DEFINED
|
|
#define Metrics_DEFINED
|
|
|
|
#include <map>
|
|
#include "modules/skparagraph/include/TextStyle.h"
|
|
|
|
namespace skia {
|
|
namespace textlayout {
|
|
class StyleMetrics {
|
|
public:
|
|
StyleMetrics(const TextStyle* style) : text_style(style) {}
|
|
|
|
StyleMetrics(const TextStyle* style, SkFontMetrics& metrics)
|
|
: text_style(style), font_metrics(metrics) {}
|
|
|
|
const TextStyle* text_style;
|
|
|
|
// SkFontMetrics contains the following metrics:
|
|
//
|
|
// * Top distance to reserve above baseline
|
|
// * Ascent distance to reserve below baseline
|
|
// * Descent extent below baseline
|
|
// * Bottom extent below baseline
|
|
// * Leading distance to add between lines
|
|
// * AvgCharWidth average character width
|
|
// * MaxCharWidth maximum character width
|
|
// * XMin minimum x
|
|
// * XMax maximum x
|
|
// * XHeight height of lower-case 'x'
|
|
// * CapHeight height of an upper-case letter
|
|
// * UnderlineThickness underline thickness
|
|
// * UnderlinePosition underline position relative to baseline
|
|
// * StrikeoutThickness strikeout thickness
|
|
// * StrikeoutPosition strikeout position relative to baseline
|
|
SkFontMetrics font_metrics;
|
|
};
|
|
|
|
class LineMetrics {
|
|
public:
|
|
LineMetrics() { }
|
|
|
|
LineMetrics(size_t start,
|
|
size_t end,
|
|
size_t end_excluding_whitespace,
|
|
size_t end_including_newline,
|
|
bool hard_break)
|
|
: fStartIndex(start)
|
|
, fEndIndex(end)
|
|
, fEndExcludingWhitespaces(end_excluding_whitespace)
|
|
, fEndIncludingNewline(end_including_newline)
|
|
, fHardBreak(hard_break) {}
|
|
// The following fields are used in the layout process itself.
|
|
|
|
// The indexes in the text buffer the line begins and ends.
|
|
size_t fStartIndex = 0;
|
|
size_t fEndIndex = 0;
|
|
size_t fEndExcludingWhitespaces = 0;
|
|
size_t fEndIncludingNewline = 0;
|
|
bool fHardBreak = false;
|
|
|
|
// The following fields are tracked after or during layout to provide to
|
|
// the user as well as for computing bounding boxes.
|
|
|
|
// The final computed ascent and descent for the line. This can be impacted by
|
|
// the strut, height, scaling, as well as outlying runs that are very tall.
|
|
//
|
|
// The top edge is `baseline - ascent` and the bottom edge is `baseline +
|
|
// descent`. Ascent and descent are provided as positive numbers. Raw numbers
|
|
// for specific runs of text can be obtained in run_metrics_map. These values
|
|
// are the cumulative metrics for the entire line.
|
|
double fAscent = 0.0;
|
|
double fDescent = 0.0;
|
|
double fUnscaledAscent = 0.0;
|
|
// Total height of the paragraph including the current line.
|
|
//
|
|
// The height of the current line is `round(ascent + descent)`.
|
|
double fHeight = 0.0;
|
|
// Width of the line.
|
|
double fWidth = 0.0;
|
|
// The left edge of the line. The right edge can be obtained with `left +
|
|
// width`
|
|
double fLeft = 0.0;
|
|
// The y position of the baseline for this line from the top of the paragraph.
|
|
double fBaseline = 0.0;
|
|
// Zero indexed line number
|
|
size_t fLineNumber = 0;
|
|
|
|
// Mapping between text index ranges and the FontMetrics associated with
|
|
// them. The first run will be keyed under start_index. The metrics here
|
|
// are before layout and are the base values we calculate from.
|
|
std::map<size_t, StyleMetrics> fLineMetrics;
|
|
};
|
|
|
|
} // namespace skia
|
|
} // namespace skia
|
|
|
|
#endif // Metrics_DEFINED
|