Add nativeFonts flag to Viewer.

This moves DMFontMgr and several related files which are tightly related
to fonts into tools/fonts, moves some flags around to prevent
duplication, and adds the nativeFonts handling to Viewer.

Change-Id: Id1bdad708a6b74319ac5ac9adfe21025db4ca0b2
Reviewed-on: https://skia-review.googlesource.com/108904
Commit-Queue: Ben Wagner <bungeman@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>

1 files changed, 437 insertions, 0 deletions

diff --git a/tools/fonts/create_test_font.cpp b/tools/fonts/create_test_font.cpp
new file mode 100644
index 0000000000..51c56eaee1
--- /dev/null
+++ b/tools/fonts/create_test_font.cpp
@@ -0,0 +1,437 @@
+/*
+ * 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 (int ch = 0x00; ch < 0x7f; ++ch) {
+        char str[1];
+        str[0] = ch;
+        const char* used = str;
+        SkUnichar index = SkUTF8_NextUnichar(&used);
+        SkPath path;
+        paint.getTextPath((const void*) &index, 2, 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((const void*) &index, 2, &width);
+        SkASSERT(charCount == 1);
+     // SkASSERT(floor(width) == width);  // not true for Hiragino Maru Gothic Pro
+        *widths->append() = width;
+        if (!ch) {
+            ch = 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), nullptr\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* fName;\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\", SkFontStyle(%d,%d,%s), gTestFonts[%d], \"%s\" },\n",
+                desc.fGenericName,
+                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\", SkFontStyle(%d,%d,%s), gTestFonts[%d], \"%s\" },\n",
+                desc.fFontName,
+                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 []) {
+    generate_fonts("/Library/Fonts/"); // or /usr/share/fonts/truetype/ttf-liberation/
+    generate_index(DEFAULT_FONT_NAME);
+    return 0;
+}