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skia2/tools/fonts/create_test_font.cpp
Hal Canary f107a2fd01 SkUTF 
Create new header and namespace, `SkUTF` where we are putting all of our
robust, well documented UTF-8, UTF-16, and UTF-32 functions:
`SkUTF::{Count,Next,To}UTF{8,16,32}()`.

SkUTF.h and SkUTF.cpp do not depend on the rest of Skia and are suitable
for re-use in other modules.

Some of the old UTF-{8,16} functions still live in SkUtils.h; their use
will be phased out in future CLs.

Also added more unit testing and cleaned up old tests.

Removed functions that were unused outside of tests or used only once.

Change-Id: Iaa59b8705abccf9c4ba082f855da368a0bad8380
Reviewed-on: https://skia-review.googlesource.com/143306
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
2018-07-31 20:11:19 +00:00

442 lines
16 KiB
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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
// Running create_test_font generates ./tools/fonts/test_font_index.inc
// and ./tools/fonts/test_font_<generic name>.inc which are read by
// ./tools/fonts/sk_tool_utils_font.cpp
#include "SkFontStyle.h"
#include "SkOSFile.h"
#include "SkOSPath.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkStream.h"
#include "SkTArray.h"
#include "SkTSort.h"
#include "SkTypeface.h"
#include "SkUtils.h"
#include <stdio.h>
#define DEFAULT_FONT_NAME "sans-serif"
namespace {
struct NamedFontStyle {
const char* fName;
SkFontStyle fStyle;
};
constexpr NamedFontStyle normal = {"Normal", SkFontStyle::Normal() };
constexpr NamedFontStyle bold = {"Bold", SkFontStyle::Bold() };
constexpr NamedFontStyle italic = {"Italic", SkFontStyle::Italic() };
constexpr NamedFontStyle bolditalic = {"BoldItalic", SkFontStyle::BoldItalic()};
struct FontDesc {
char const * const fGenericName;
NamedFontStyle const fNamedStyle;
char const * const fFontName;
char const * const fFile;
// fFontIndex is mutable and will be set later.
int fFontIndex;
} gFonts[] = {
{"monospace", normal, "Liberation Mono", "LiberationMono-Regular.ttf", -1},
{"monospace", bold, "Liberation Mono", "LiberationMono-Bold.ttf", -1},
{"monospace", italic, "Liberation Mono", "LiberationMono-Italic.ttf", -1},
{"monospace", bolditalic, "Liberation Mono", "LiberationMono-BoldItalic.ttf", -1},
{"sans-serif", normal, "Liberation Sans", "LiberationSans-Regular.ttf", -1},
{"sans-serif", bold, "Liberation Sans", "LiberationSans-Bold.ttf", -1},
{"sans-serif", italic, "Liberation Sans", "LiberationSans-Italic.ttf", -1},
{"sans-serif", bolditalic, "Liberation Sans", "LiberationSans-BoldItalic.ttf", -1},
{"serif", normal, "Liberation Serif", "LiberationSerif-Regular.ttf", -1},
{"serif", bold, "Liberation Serif", "LiberationSerif-Bold.ttf", -1},
{"serif", italic, "Liberation Serif", "LiberationSerif-Italic.ttf", -1},
{"serif", bolditalic, "Liberation Serif", "LiberationSerif-BoldItalic.ttf", -1},
};
const int gFontsCount = (int) SK_ARRAY_COUNT(gFonts);
const char gHeader[] =
"/*\n"
" * Copyright 2015 Google Inc.\n"
" *\n"
" * Use of this source code is governed by a BSD-style license that can be\n"
" * found in the LICENSE file.\n"
" */\n"
"\n"
"// Auto-generated by ";
} // namespace
static FILE* font_header(const char* family) {
SkString outPath(SkOSPath::Join(".", "tools"));
outPath = SkOSPath::Join(outPath.c_str(), "fonts");
outPath = SkOSPath::Join(outPath.c_str(), "test_font_");
SkString fam(family);
do {
int dashIndex = fam.find("-");
if (dashIndex < 0) {
break;
}
fam.writable_str()[dashIndex] = '_';
} while (true);
outPath.append(fam);
outPath.append(".inc");
FILE* out = fopen(outPath.c_str(), "w");
fprintf(out, "%s%s\n\n", gHeader, SkOSPath::Basename(__FILE__).c_str());
return out;
}
enum {
kMaxLineLength = 80,
};
static ptrdiff_t last_line_length(const SkString& str) {
const char* first = str.c_str();
const char* last = first + str.size();
const char* ptr = last;
while (ptr > first && *--ptr != '\n')
;
return last - ptr - 1;
}
static void output_fixed(SkScalar num, int emSize, SkString* out) {
int hex = (int) (num * 65536 / emSize);
out->appendf("0x%08x,", hex);
*out += (int) last_line_length(*out) >= kMaxLineLength ? '\n' : ' ';
}
static void output_scalar(SkScalar num, int emSize, SkString* out) {
num /= emSize;
if (num == (int) num) {
out->appendS32((int) num);
} else {
SkString str;
str.printf("%1.6g", num);
int width = (int) str.size();
const char* cStr = str.c_str();
while (cStr[width - 1] == '0') {
--width;
}
str.remove(width, str.size() - width);
out->appendf("%sf", str.c_str());
}
*out += ',';
*out += (int) last_line_length(*out) >= kMaxLineLength ? '\n' : ' ';
}
static int output_points(const SkPoint* pts, int emSize, int count, SkString* ptsOut) {
for (int index = 0; index < count; ++index) {
// SkASSERT(floor(pts[index].fX) == pts[index].fX);
output_scalar(pts[index].fX, emSize, ptsOut);
// SkASSERT(floor(pts[index].fY) == pts[index].fY);
output_scalar(pts[index].fY, emSize, ptsOut);
}
return count;
}
static void output_path_data(const SkPaint& paint,
int emSize, SkString* ptsOut, SkTDArray<SkPath::Verb>* verbs,
SkTDArray<unsigned>* charCodes, SkTDArray<SkScalar>* widths) {
for (SkUnichar index = 0x00; index < 0x7f; ++index) {
uint16_t utf16[2];
size_t utf16Bytes = sizeof(uint16_t) * SkUTF::ToUTF16(index, utf16);
SkPath path;
SkASSERT(paint.getTextEncoding() == SkPaint::kUTF16_TextEncoding);
paint.getTextPath(utf16, utf16Bytes, 0, 0, &path);
SkPath::RawIter iter(path);
SkPath::Verb verb;
SkPoint pts[4];
while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
*verbs->append() = verb;
switch (verb) {
case SkPath::kMove_Verb:
output_points(&pts[0], emSize, 1, ptsOut);
break;
case SkPath::kLine_Verb:
output_points(&pts[1], emSize, 1, ptsOut);
break;
case SkPath::kQuad_Verb:
output_points(&pts[1], emSize, 2, ptsOut);
break;
case SkPath::kCubic_Verb:
output_points(&pts[1], emSize, 3, ptsOut);
break;
case SkPath::kClose_Verb:
break;
default:
SkDEBUGFAIL("bad verb");
SkASSERT(0);
}
}
*verbs->append() = SkPath::kDone_Verb;
*charCodes->append() = index;
SkScalar width;
SkDEBUGCODE(int charCount =) paint.getTextWidths(utf16, utf16Bytes, &width);
SkASSERT(charCount == 1);
// SkASSERT(floor(width) == width); // not true for Hiragino Maru Gothic Pro
*widths->append() = width;
if (0 == index) {
index = 0x1f; // skip the rest of the control codes
}
}
}
static int offset_str_len(unsigned num) {
if (num == (unsigned) -1) {
return 10;
}
unsigned result = 1;
unsigned ref = 10;
while (ref <= num) {
++result;
ref *= 10;
}
return result;
}
static SkString strip_spaces(const SkString& str) {
SkString result;
int count = (int) str.size();
for (int index = 0; index < count; ++index) {
char c = str[index];
if (c != ' ' && c != '-') {
result += c;
}
}
return result;
}
static SkString strip_final(const SkString& str) {
SkString result(str);
if (result.endsWith("\n")) {
result.remove(result.size() - 1, 1);
}
if (result.endsWith(" ")) {
result.remove(result.size() - 1, 1);
}
if (result.endsWith(",")) {
result.remove(result.size() - 1, 1);
}
return result;
}
static void output_font(sk_sp<SkTypeface> face, const char* name, NamedFontStyle style, FILE* out) {
int emSize = face->getUnitsPerEm() * 2;
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextAlign(SkPaint::kLeft_Align);
paint.setTextEncoding(SkPaint::kUTF16_TextEncoding);
paint.setTextSize(emSize);
paint.setTypeface(std::move(face));
SkTDArray<SkPath::Verb> verbs;
SkTDArray<unsigned> charCodes;
SkTDArray<SkScalar> widths;
SkString ptsOut;
output_path_data(paint, emSize, &ptsOut, &verbs, &charCodes, &widths);
SkString fontnameStr(name);
SkString strippedStr = strip_spaces(fontnameStr);
strippedStr.appendf("%s", style.fName);
const char* fontname = strippedStr.c_str();
fprintf(out, "const SkScalar %sPoints[] = {\n", fontname);
ptsOut = strip_final(ptsOut);
fprintf(out, "%s", ptsOut.c_str());
fprintf(out, "\n};\n\n");
fprintf(out, "const unsigned char %sVerbs[] = {\n", fontname);
int verbCount = verbs.count();
int outChCount = 0;
for (int index = 0; index < verbCount;) {
SkPath::Verb verb = verbs[index];
SkASSERT(verb >= SkPath::kMove_Verb && verb <= SkPath::kDone_Verb);
SkASSERT((unsigned) verb == (unsigned char) verb);
fprintf(out, "%u", verb);
if (++index < verbCount) {
outChCount += 3;
fprintf(out, "%c", ',');
if (outChCount >= kMaxLineLength) {
outChCount = 0;
fprintf(out, "%c", '\n');
} else {
fprintf(out, "%c", ' ');
}
}
}
fprintf(out, "\n};\n\n");
// all fonts are now 0x00, 0x20 - 0xFE
// don't need to generate or output character codes?
fprintf(out, "const unsigned %sCharCodes[] = {\n", fontname);
int offsetCount = charCodes.count();
for (int index = 0; index < offsetCount;) {
unsigned offset = charCodes[index];
fprintf(out, "%u", offset);
if (++index < offsetCount) {
outChCount += offset_str_len(offset) + 2;
fprintf(out, "%c", ',');
if (outChCount >= kMaxLineLength) {
outChCount = 0;
fprintf(out, "%c", '\n');
} else {
fprintf(out, "%c", ' ');
}
}
}
fprintf(out, "\n};\n\n");
SkString widthsStr;
fprintf(out, "const SkFixed %sWidths[] = {\n", fontname);
for (int index = 0; index < offsetCount; ++index) {
output_fixed(widths[index], emSize, &widthsStr);
}
widthsStr = strip_final(widthsStr);
fprintf(out, "%s\n};\n\n", widthsStr.c_str());
fprintf(out, "const int %sCharCodesCount = (int) SK_ARRAY_COUNT(%sCharCodes);\n\n",
fontname, fontname);
SkPaint::FontMetrics metrics;
paint.getFontMetrics(&metrics);
fprintf(out, "const SkPaint::FontMetrics %sMetrics = {\n", fontname);
SkString metricsStr;
metricsStr.printf("0x%08x, ", metrics.fFlags);
output_scalar(metrics.fTop, emSize, &metricsStr);
output_scalar(metrics.fAscent, emSize, &metricsStr);
output_scalar(metrics.fDescent, emSize, &metricsStr);
output_scalar(metrics.fBottom, emSize, &metricsStr);
output_scalar(metrics.fLeading, emSize, &metricsStr);
output_scalar(metrics.fAvgCharWidth, emSize, &metricsStr);
output_scalar(metrics.fMaxCharWidth, emSize, &metricsStr);
output_scalar(metrics.fXMin, emSize, &metricsStr);
output_scalar(metrics.fXMax, emSize, &metricsStr);
output_scalar(metrics.fXHeight, emSize, &metricsStr);
output_scalar(metrics.fCapHeight, emSize, &metricsStr);
output_scalar(metrics.fUnderlineThickness, emSize, &metricsStr);
output_scalar(metrics.fUnderlinePosition, emSize, &metricsStr);
output_scalar(metrics.fStrikeoutThickness, emSize, &metricsStr);
output_scalar(metrics.fStrikeoutPosition, emSize, &metricsStr);
metricsStr = strip_final(metricsStr);
fprintf(out, "%s\n};\n\n", metricsStr.c_str());
}
struct FontWritten {
const char* fFontName;
NamedFontStyle fNamedStyle;
};
static SkTDArray<FontWritten> gWritten;
static int written_index(const FontDesc& fontDesc) {
for (int index = 0; index < gWritten.count(); ++index) {
const FontWritten& writ = gWritten[index];
if (!strcmp(fontDesc.fFontName, writ.fFontName) &&
fontDesc.fNamedStyle.fStyle == writ.fNamedStyle.fStyle)
{
return index;
}
}
return -1;
}
static void generate_fonts(const char* basepath) {
FILE* out = nullptr;
for (int index = 0; index < gFontsCount; ++index) {
FontDesc& fontDesc = gFonts[index];
if ((index & 3) == 0) {
out = font_header(fontDesc.fGenericName);
}
int fontIndex = written_index(fontDesc);
if (fontIndex >= 0) {
fontDesc.fFontIndex = fontIndex;
continue;
}
SkString filepath(SkOSPath::Join(basepath, fontDesc.fFile));
SkASSERTF(sk_exists(filepath.c_str()), "The file %s does not exist.", filepath.c_str());
sk_sp<SkTypeface> resourceTypeface = SkTypeface::MakeFromFile(filepath.c_str());
SkASSERTF(resourceTypeface, "The file %s is not a font.", filepath.c_str());
output_font(std::move(resourceTypeface), fontDesc.fFontName, fontDesc.fNamedStyle, out);
fontDesc.fFontIndex = gWritten.count();
FontWritten* writ = gWritten.append();
writ->fFontName = fontDesc.fFontName;
writ->fNamedStyle = fontDesc.fNamedStyle;
if ((index & 3) == 3) {
fclose(out);
}
}
}
static const char* slant_to_string(SkFontStyle::Slant slant) {
switch (slant) {
case SkFontStyle::kUpright_Slant: return "SkFontStyle::kUpright_Slant";
case SkFontStyle::kItalic_Slant : return "SkFontStyle::kItalic_Slant" ;
case SkFontStyle::kOblique_Slant: return "SkFontStyle::kOblique_Slant";
default: SK_ABORT("Unknown slant"); return "";
}
}
static void generate_index(const char* defaultName) {
FILE* out = font_header("index");
fprintf(out, "static SkTestFontData gTestFonts[] = {\n");
for (const FontWritten& writ : gWritten) {
const char* name = writ.fFontName;
SkString strippedStr = strip_spaces(SkString(name));
strippedStr.appendf("%s", writ.fNamedStyle.fName);
const char* strip = strippedStr.c_str();
fprintf(out,
" { %sPoints, %sVerbs, %sCharCodes,\n"
" %sCharCodesCount, %sWidths,\n"
" %sMetrics, \"Toy %s\", SkFontStyle(%d,%d,%s)\n"
" },\n",
strip, strip, strip, strip, strip, strip, name,
writ.fNamedStyle.fStyle.weight(), writ.fNamedStyle.fStyle.width(),
slant_to_string(writ.fNamedStyle.fStyle.slant()));
}
fprintf(out, "};\n\n");
fprintf(out, "const int gTestFontsCount = (int) SK_ARRAY_COUNT(gTestFonts);\n\n");
fprintf(out,
"struct SubFont {\n"
" const char* fFamilyName;\n"
" const char* fStyleName;\n"
" SkFontStyle fStyle;\n"
" SkTestFontData& fFont;\n"
" const char* fFile;\n"
"};\n\n"
"const SubFont gSubFonts[] = {\n");
int defaultIndex = -1;
for (int subIndex = 0; subIndex < gFontsCount; subIndex++) {
const FontDesc& desc = gFonts[subIndex];
if (defaultIndex < 0 && !strcmp(defaultName, desc.fGenericName)) {
defaultIndex = subIndex;
}
fprintf(out,
" { \"%s\", \"%s\", SkFontStyle(%d,%d,%s), gTestFonts[%d], \"%s\" },\n",
desc.fGenericName, desc.fNamedStyle.fName,
desc.fNamedStyle.fStyle.weight(), desc.fNamedStyle.fStyle.width(),
slant_to_string(desc.fNamedStyle.fStyle.slant()), desc.fFontIndex, desc.fFile);
}
for (int subIndex = 0; subIndex < gFontsCount; subIndex++) {
const FontDesc& desc = gFonts[subIndex];
fprintf(out,
" { \"Toy %s\", \"%s\", SkFontStyle(%d,%d,%s), gTestFonts[%d], \"%s\" },\n",
desc.fFontName, desc.fNamedStyle.fName,
desc.fNamedStyle.fStyle.weight(), desc.fNamedStyle.fStyle.width(),
slant_to_string(desc.fNamedStyle.fStyle.slant()), desc.fFontIndex, desc.fFile);
}
fprintf(out, "};\n\n");
fprintf(out, "const int gSubFontsCount = (int) SK_ARRAY_COUNT(gSubFonts);\n\n");
SkASSERT(defaultIndex >= 0);
fprintf(out, "const int gDefaultFontIndex = %d;\n", defaultIndex);
fclose(out);
}
int main(int , char * const []) {
#ifdef SK_BUILD_FOR_UNIX
generate_fonts("/usr/share/fonts/truetype/liberation/");
#else
generate_fonts("/Library/Fonts/"); // or /usr/share/fonts/truetype/ttf-liberation/
#endif
generate_index(DEFAULT_FONT_NAME);
return 0;
}
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