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Copy pathresource.cpp
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1587 lines (1345 loc) · 48.9 KB
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//-----------------------------------------------------------------------------
// Discovery and loading of our resources (icons, fonts, templates, etc).
//
// Copyright 2016 whitequark
//-----------------------------------------------------------------------------
#include <zlib.h>
#include <png.h>
#include <regex>
#include "solvespace.h"
namespace SolveSpace {
//-----------------------------------------------------------------------------
// Resource loading functions
//-----------------------------------------------------------------------------
std::string LoadString(const std::string &name) {
size_t size;
const void *data = Platform::LoadResource(name, &size);
std::string result(static_cast<const char *>(data), size);
// When editing resources under Windows, Windows newlines may sneak in.
// Any files with them won't be merged, but ignoring them during development
// helps external contributors.
result.erase(std::remove(result.begin(), result.end(), '\r'),
result.end());
return result;
}
std::string LoadStringFromGzip(const std::string &name) {
size_t deflatedSize;
const void *data = Platform::LoadResource(name, &deflatedSize);
z_stream stream;
stream.zalloc = Z_NULL;
stream.zfree = Z_NULL;
stream.opaque = Z_NULL;
const int windowBits = /*maximum window*/ 15 + /*decode gzip header*/16;
ssassert(inflateInit2(&stream, windowBits) == Z_OK, "Cannot start inflation");
// Extract length mod 2**32 from the gzip trailer.
std::string result;
ssassert(deflatedSize >= 4, "Resource too small to have gzip trailer");
// *(uint32_t *) may perform an unaligned access, so do a memcpy.
uint32_t inflatedSize;
memcpy(&inflatedSize, (uint8_t *)((uintptr_t)data + deflatedSize - 4), sizeof(uint32_t));
result.resize(inflatedSize);
stream.next_in = (Bytef *)data;
stream.avail_in = (uInt)deflatedSize;
stream.next_out = (Bytef *)&result[0];
stream.avail_out = (uInt)result.length();
ssassert(inflate(&stream, Z_NO_FLUSH) == Z_STREAM_END, "Cannot inflate resource");
ssassert(stream.avail_out == 0, "Inflated resource larger than what trailer indicates");
inflateEnd(&stream);
return result;
}
std::shared_ptr<Pixmap> LoadPng(const std::string &name) {
size_t size;
const void *data = Platform::LoadResource(name, &size);
std::shared_ptr<Pixmap> pixmap = Pixmap::FromPng(static_cast<const uint8_t *>(data), size);
ssassert(pixmap != nullptr, "Cannot load pixmap");
return pixmap;
}
//-----------------------------------------------------------------------------
// Pixmap manipulation
//-----------------------------------------------------------------------------
size_t Pixmap::GetBytesPerPixel() const {
switch(format) {
case Format::RGBA: return 4;
case Format::BGRA: return 4;
case Format::RGB: return 3;
case Format::BGR: return 3;
case Format::A: return 1;
}
ssassert(false, "Unexpected pixmap format");
}
RgbaColor Pixmap::GetPixel(size_t x, size_t y) const {
const uint8_t *pixel = &data[y * stride + x * GetBytesPerPixel()];
switch(format) {
case Format::RGBA:
return RgbaColor::From(pixel[0], pixel[1], pixel[2], pixel[3]);
case Format::RGB:
return RgbaColor::From(pixel[0], pixel[1], pixel[2], 255);
case Format::BGRA:
return RgbaColor::From(pixel[2], pixel[1], pixel[0], pixel[3]);
case Format::BGR:
return RgbaColor::From(pixel[2], pixel[1], pixel[0], 255);
case Format::A:
return RgbaColor::From( 255, 255, 255, pixel[0]);
}
ssassert(false, "Unexpected resource format");
}
void Pixmap::SetPixel(size_t x, size_t y, RgbaColor color) {
uint8_t *pixel = &data[y * stride + x * GetBytesPerPixel()];
switch(format) {
case Format::RGBA:
pixel[0] = color.red;
pixel[1] = color.green;
pixel[2] = color.blue;
pixel[3] = color.alpha;
break;
case Format::RGB:
pixel[0] = color.red;
pixel[1] = color.green;
pixel[2] = color.blue;
break;
case Format::BGRA:
pixel[0] = color.blue;
pixel[1] = color.green;
pixel[2] = color.red;
pixel[3] = color.alpha;
break;
case Format::BGR:
pixel[0] = color.blue;
pixel[1] = color.green;
pixel[2] = color.red;
break;
case Format::A:
pixel[0] = color.alpha;
break;
}
}
void Pixmap::ConvertTo(Format newFormat) {
switch(format) {
case Format::RGBA:
ssassert(newFormat == Format::BGRA, "Unexpected target format");
break;
case Format::BGRA:
ssassert(newFormat == Format::RGBA, "Unexpected target format");
break;
case Format::RGB:
ssassert(newFormat == Format::BGR, "Unexpected target format");
break;
case Format::BGR:
ssassert(newFormat == Format::RGB, "Unexpected target format");
break;
case Format::A:
ssassert(false, "Unexpected target format");
}
size_t bpp = GetBytesPerPixel();
for(size_t j = 0; j != height; j++) {
uint8_t *row = &data[j * stride];
for(size_t i = 0; i != width * bpp; i += bpp) {
// This handles both RGB<>BGR and RGBA<>BGRA.
std::swap(row[i], row[i + 2]);
}
}
format = newFormat;
}
static std::shared_ptr<Pixmap> ReadPngIntoPixmap(png_struct *png_ptr, png_info *info_ptr,
bool flip) {
png_read_png(png_ptr, info_ptr,
PNG_TRANSFORM_EXPAND | PNG_TRANSFORM_GRAY_TO_RGB | PNG_TRANSFORM_SCALE_16, NULL);
std::shared_ptr<Pixmap> pixmap = std::make_shared<Pixmap>();
pixmap->width = png_get_image_width(png_ptr, info_ptr);
pixmap->height = png_get_image_height(png_ptr, info_ptr);
if((png_get_color_type(png_ptr, info_ptr) & PNG_COLOR_MASK_ALPHA) != 0) {
pixmap->format = Pixmap::Format::RGBA;
} else {
pixmap->format = Pixmap::Format::RGB;
}
size_t stride = pixmap->width * pixmap->GetBytesPerPixel();
if(stride % 4 != 0) stride += 4 - stride % 4;
pixmap->stride = stride;
pixmap->data = std::vector<uint8_t>(pixmap->stride * pixmap->height);
uint8_t **rows = png_get_rows(png_ptr, info_ptr);
for(size_t y = 0; y < pixmap->height; y++) {
uint8_t *srcRow = flip ? rows[pixmap->height - y - 1] : rows[y];
memcpy(&pixmap->data[pixmap->stride * y], srcRow,
pixmap->width * pixmap->GetBytesPerPixel());
}
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return pixmap;
}
std::shared_ptr<Pixmap> Pixmap::FromPng(const uint8_t *data, size_t size, bool flip) {
struct Slice { const uint8_t *data; size_t size; };
Slice dataSlice = { data, size };
png_struct *png_ptr = NULL;
png_info *info_ptr = NULL;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(!png_ptr) goto exit;
info_ptr = png_create_info_struct(png_ptr);
if(!info_ptr) goto exit;
if(setjmp(png_jmpbuf(png_ptr))) goto exit;
png_set_read_fn(png_ptr, &dataSlice,
[](png_struct *png_ptr, uint8_t *data, size_t size) {
Slice *dataSlice = (Slice *)png_get_io_ptr(png_ptr);
if(size <= dataSlice->size) {
memcpy(data, dataSlice->data, size);
dataSlice->data += size;
dataSlice->size -= size;
} else {
png_error(png_ptr, "EOF");
}
});
return ReadPngIntoPixmap(png_ptr, info_ptr, flip);
exit:
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return nullptr;
}
std::shared_ptr<Pixmap> Pixmap::ReadPng(FILE *f, bool flip) {
png_struct *png_ptr = NULL;
png_info *info_ptr = NULL;
uint8_t header[8];
if(fread(header, 1, sizeof(header), f) != sizeof(header)) goto exit;
if(png_sig_cmp(header, 0, sizeof(header))) goto exit;
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(!png_ptr) goto exit;
info_ptr = png_create_info_struct(png_ptr);
if(!info_ptr) goto exit;
if(setjmp(png_jmpbuf(png_ptr))) goto exit;
png_init_io(png_ptr, f);
png_set_sig_bytes(png_ptr, sizeof(header));
return ReadPngIntoPixmap(png_ptr, info_ptr, flip);
exit:
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return nullptr;
}
std::shared_ptr<Pixmap> Pixmap::ReadPng(const Platform::Path &filename, bool flip) {
FILE *f = OpenFile(filename, "rb");
if(!f) return NULL;
std::shared_ptr<Pixmap> pixmap = ReadPng(f, flip);
fclose(f);
return pixmap;
}
bool Pixmap::WritePng(FILE *f, bool flip) {
int colorType = 0;
bool bgr = false;
switch(format) {
case Format::RGBA: colorType = PNG_COLOR_TYPE_RGBA; bgr = false; break;
case Format::BGRA: colorType = PNG_COLOR_TYPE_RGBA; bgr = true; break;
case Format::RGB: colorType = PNG_COLOR_TYPE_RGB; bgr = false; break;
case Format::BGR: colorType = PNG_COLOR_TYPE_RGB; bgr = true; break;
case Format::A: colorType = PNG_COLOR_TYPE_GRAY; bgr = false; break;
}
std::vector<uint8_t *> rows;
for(size_t y = 0; y < height; y++) {
if(flip) {
rows.push_back(&data[stride * (height - y - 1)]);
} else {
rows.push_back(&data[stride * y]);
}
}
png_struct *png_ptr = NULL;
png_info *info_ptr = NULL;
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(!png_ptr) goto exit;
info_ptr = png_create_info_struct(png_ptr);
if(!info_ptr) goto exit;
if(setjmp(png_jmpbuf(png_ptr))) goto exit;
png_init_io(png_ptr, f);
png_set_IHDR(png_ptr, info_ptr,
(png_uint_32)width, (png_uint_32)height, 8, colorType,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
if(bgr) png_set_bgr(png_ptr);
png_write_info(png_ptr, info_ptr);
png_write_image(png_ptr, &rows[0]);
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
return true;
exit:
png_destroy_write_struct(&png_ptr, &info_ptr);
return false;
}
bool Pixmap::WritePng(const Platform::Path &filename, bool flip) {
FILE *f = OpenFile(filename, "wb");
if(!f) return false;
bool success = WritePng(f, flip);
fclose(f);
return success;
}
bool Pixmap::Equals(const Pixmap &other) const {
if(format != other.format || width != other.width || height != other.height) {
return false;
}
size_t rowLength = width * GetBytesPerPixel();
for(size_t y = 0; y < height; y++) {
if(memcmp(&data[y * stride], &other.data[y * other.stride], rowLength)) {
return false;
}
}
return true;
}
std::shared_ptr<Pixmap> Pixmap::Create(Format format, size_t width, size_t height) {
std::shared_ptr<Pixmap> pixmap = std::make_shared<Pixmap>();
pixmap->format = format;
pixmap->width = width;
pixmap->height = height;
// Align to fulfill OpenGL texture requirements.
size_t stride = pixmap->width * pixmap->GetBytesPerPixel();
if(stride % 4 != 0) stride += 4 - stride % 4;
pixmap->stride = stride;
pixmap->data = std::vector<uint8_t>(pixmap->stride * pixmap->height);
return pixmap;
}
std::shared_ptr<Pixmap> Pixmap::Copy() {
std::shared_ptr<Pixmap> pixmap = std::make_shared<Pixmap>();
pixmap->format = format;
pixmap->width = width;
pixmap->height = height;
pixmap->stride = stride;
pixmap->data = data;
return pixmap;
}
//-----------------------------------------------------------------------------
// ASCII sequence parsing
//-----------------------------------------------------------------------------
class ASCIIReader {
public:
std::string::const_iterator pos, end;
static ASCIIReader From(const std::string &str) {
return ASCIIReader({ str.cbegin(), str.cend() });
}
bool AtEnd() const {
return pos == end;
}
bool SkipSpace() {
bool skipped = false;
while(!AtEnd()) {
char c = *pos;
if(!(c == ' ' || c == '\t' || c == '\n')) break;
skipped = true;
pos++;
}
return skipped;
}
char PeekChar() {
ssassert(!AtEnd(), "Unexpected EOF");
return *pos;
}
char ReadChar() {
ssassert(!AtEnd(), "Unexpected EOF");
return *pos++;
}
bool TryChar(char c) {
if(AtEnd()) {
return false;
} else if(*pos == c) {
pos++;
return true;
} else {
return false;
}
}
void ExpectChar(char c) {
if(!TryChar(c)) {
dbp("Expecting character '%c'", c);
ssassert(false, "Unexpected character");
}
}
bool TryString(const std::string &s) {
if((size_t)(end - pos) >= s.size() && std::string(pos, pos + s.size()) == s) {
pos += s.size();
return true;
} else {
return false;
}
}
void ExpectString(const std::string &s) {
if(!TryString(s)) {
dbp("Expecting string '%s'", s.c_str());
ssassert(false, "Unexpected string");
}
}
size_t CountUntilEol() const {
return std::find(pos, end, '\n') - pos;
}
void SkipUntilEol() {
pos = std::find(pos, end, '\n');
}
std::string ReadUntilEol() {
auto eol = std::find(pos, end, '\n');
std::string result(pos, eol);
if(eol != end) {
pos = eol + 1;
} else {
pos = end;
}
return result;
}
uint8_t Read4HexBits() {
char c = ReadChar();
if(c >= '0' && c <= '9') {
return c - '0';
} else if(c >= 'a' && c <= 'f') {
return 10 + (c - 'a');
} else if(c >= 'A' && c <= 'F') {
return 10 + (c - 'A');
} else ssassert(false, "Unexpected hex digit");
}
uint8_t Read8HexBits() {
uint8_t h = Read4HexBits(),
l = Read4HexBits();
return (h << 4) + l;
}
uint16_t Read16HexBits() {
uint16_t h = Read8HexBits(),
l = Read8HexBits();
return (h << 8) + l;
}
long ReadIntegerDecimal(int base = 10) {
char *endptr;
long l = strtol(&*pos, &endptr, base);
ssassert(&*pos != endptr, "Cannot read an integer number");
pos += endptr - &*pos;
return l;
}
double ReadFloatDecimal() {
char *endptr;
double d = strtod(&*pos, &endptr);
ssassert(&*pos != endptr, "Cannot read a floating-point number");
pos += endptr - &*pos;
return d;
}
bool TryRegex(const std::regex &re, std::smatch *m) {
if(std::regex_search(pos, end, *m, re, std::regex_constants::match_continuous)) {
pos += m->length();
return true;
} else {
return false;
}
}
void ExpectRegex(const std::regex &re, std::smatch *m) {
ssassert(TryRegex(re, m), "Unmatched regex");
}
};
//-----------------------------------------------------------------------------
// Bitmap font manipulation
//-----------------------------------------------------------------------------
static uint8_t *BitmapFontTextureRow(std::shared_ptr<Pixmap> texture,
uint16_t position, size_t y) {
// position = 0;
size_t col = position % (texture->width / 16),
row = position / (texture->width / 16);
return &texture->data[texture->stride * (16 * row + y) + 16 * col];
}
BitmapFont BitmapFont::From(std::string &&unifontData) {
BitmapFont font = {};
font.unifontData = std::move(unifontData);
font.texture = Pixmap::Create(Pixmap::Format::A, 1024, 1024);
return font;
}
void BitmapFont::AddGlyph(char32_t codepoint, std::shared_ptr<const Pixmap> pixmap) {
ssassert((pixmap->width == 8 || pixmap->width == 16) && pixmap->height == 16,
"Unexpected pixmap dimensions");
ssassert(pixmap->format == Pixmap::Format::RGB,
"Unexpected pixmap format");
ssassert(glyphs.find(codepoint) == glyphs.end(),
"Glyph with this codepoint already exists");
ssassert(nextPosition != 0xffff,
"Too many glyphs for current texture size");
BitmapFont::Glyph glyph = {};
glyph.advanceCells = (uint8_t)(pixmap->width / 8);
glyph.position = nextPosition++;
glyphs.emplace(codepoint, glyph);
for(size_t y = 0; y < pixmap->height; y++) {
uint8_t *row = BitmapFontTextureRow(texture, glyph.position, y);
for(size_t x = 0; x < pixmap->width; x++) {
if((pixmap->GetPixel(x, y).ToPackedInt() & 0xffffff) != 0) {
row[x] = 255;
}
}
}
}
const BitmapFont::Glyph &BitmapFont::GetGlyph(char32_t codepoint) {
auto it = glyphs.find(codepoint);
if(it != glyphs.end()) {
return (*it).second;
}
ssassert(nextPosition != 0xffff,
"Too many glyphs for current texture size");
// Find the hex representation in the (sorted) Unifont file.
auto first = unifontData.cbegin(),
last = unifontData.cend();
while(first < last) {
auto mid = first + (last - first) / 2;
while(mid != unifontData.cbegin()) {
if(*mid == '\n') {
mid++;
break;
}
mid--;
}
ASCIIReader reader = { mid, unifontData.cend() };
if(reader.AtEnd()) break;
// Read the codepoint.
char32_t foundCodepoint = reader.Read16HexBits();
reader.ExpectChar(':');
if(foundCodepoint > codepoint) {
last = mid - 1;
continue; // and first stays the same
}
if(foundCodepoint < codepoint) {
first = mid + 1;
while(first != unifontData.cend()) {
if(*first == '\n') {
first++;
break;
}
first++;
}
continue; // and last stays the same
}
// Found the codepoint.
Glyph glyph = {};
glyph.position = nextPosition++;
// Read glyph bits.
unsigned short glyphBits[16];
size_t glyphLength = reader.CountUntilEol();
if(glyphLength == 4 * 16) {
glyph.advanceCells = 2;
for(size_t i = 0; i < 16; i++) {
glyphBits[i] = reader.Read16HexBits();
}
} else if(glyphLength == 2 * 16) {
glyph.advanceCells = 1;
for(size_t i = 0; i < 16; i++) {
glyphBits[i] = (uint16_t)reader.Read8HexBits() << 8;
}
} else ssassert(false, "Unexpected glyph bitmap length");
// Fill in the texture (one texture byte per glyph bit).
for(size_t y = 0; y < 16; y++) {
uint8_t *row = BitmapFontTextureRow(texture, glyph.position, y);
for(size_t x = 0; x < 16; x++) {
if(glyphBits[y] & (1 << (15 - x))) {
row[x] = 255;
}
}
}
it = glyphs.emplace(codepoint, glyph).first;
textureUpdated = true;
return (*it).second;
}
// Glyph doesn't exist; return replacement glyph instead.
ssassert(codepoint != 0xfffd, "Cannot parse replacement glyph");
return GetGlyph(0xfffd);
}
void BitmapFont::LocateGlyph(char32_t codepoint,
double *s0, double *t0, double *s1, double *t1,
size_t *w, size_t *h) {
const Glyph &glyph = GetGlyph(codepoint);
*w = glyph.advanceCells * 8;
*h = 16;
*s0 = (16.0 * (glyph.position % (texture->width / 16))) / texture->width;
*s1 = *s0 + (double)(*w) / texture->width;
*t0 = (16.0 * (glyph.position / (texture->width / 16))) / texture->height;
*t1 = *t0 + (double)(*h) / texture->height;
}
size_t BitmapFont::GetWidth(char32_t codepoint) {
if(codepoint >= 0xe000 && codepoint <= 0xefff) {
// These are special-cased because checkboxes predate support for 2 cell wide
// characters; and so all Printf() calls pad them with spaces.
return 1;
}
return GetGlyph(codepoint).advanceCells;
}
size_t BitmapFont::GetWidth(const std::string &str) {
size_t width = 0;
for(char32_t codepoint : ReadUTF8(str)) {
width += GetWidth(codepoint);
}
return width;
}
BitmapFont BitmapFont::Create() {
BitmapFont Font = BitmapFont::From(LoadStringFromGzip("fonts/unifont.hex.gz"));
// Unifont doesn't have a glyph for U+0020.
Font.AddGlyph(0x0020, Pixmap::Create(Pixmap::Format::RGB, 8, 16));
Font.AddGlyph(0xE000, LoadPng("fonts/private/0-check-false.png"));
Font.AddGlyph(0xE001, LoadPng("fonts/private/1-check-true.png"));
Font.AddGlyph(0xE002, LoadPng("fonts/private/2-radio-false.png"));
Font.AddGlyph(0xE003, LoadPng("fonts/private/3-radio-true.png"));
Font.AddGlyph(0xE004, LoadPng("fonts/private/4-stipple-dot.png"));
Font.AddGlyph(0xE005, LoadPng("fonts/private/5-stipple-dash-long.png"));
Font.AddGlyph(0xE006, LoadPng("fonts/private/6-stipple-dash.png"));
Font.AddGlyph(0xE007, LoadPng("fonts/private/7-stipple-zigzag.png"));
return Font;
}
//-----------------------------------------------------------------------------
// Vector font manipulation
//-----------------------------------------------------------------------------
const static int ARC_POINTS = 8;
static void MakePwlArc(VectorFont::Contour *contour, bool isReversed,
const Point2d &cp, double radius, double a1, double a2) {
if(radius < LENGTH_EPS) return;
double aSign = 1.0;
if(isReversed) {
if(a1 <= a2 + LENGTH_EPS) a1 += 2.0 * M_PI;
aSign = -1.0;
} else {
if(a2 <= a1 + LENGTH_EPS) a2 += 2.0 * M_PI;
}
double aStep = aSign * fabs(a2 - a1) / (double)ARC_POINTS;
for(int i = 0; i <= ARC_POINTS; i++) {
contour->points.emplace_back(cp.Plus(Point2d::FromPolar(radius, a1 + aStep * i)));
}
}
static void MakePwlBulge(VectorFont::Contour *contour, const Point2d &v, double bulge) {
bool reversed = bulge < 0.0;
double alpha = atan(bulge) * 4.0;
const Point2d &point = contour->points.back();
Point2d middle = point.Plus(v).ScaledBy(0.5);
double dist = point.DistanceTo(v) / 2.0;
double angle = point.AngleTo(v);
// alpha can't be 0.0 at this point
double radius = fabs(dist / sin(alpha / 2.0));
double wu = fabs(radius*radius - dist*dist);
double h = sqrt(wu);
if(bulge > 0.0) {
angle += M_PI_2;
} else {
angle -= M_PI_2;
}
if(fabs(alpha) > M_PI) {
h = -h;
}
Point2d center = Point2d::FromPolar(h, angle).Plus(middle);
double a1 = center.AngleTo(point);
double a2 = center.AngleTo(v);
MakePwlArc(contour, reversed, center, radius, a1, a2);
}
static void GetGlyphBBox(const VectorFont::Glyph &glyph,
double *rminx, double *rmaxx, double *rminy, double *rmaxy) {
double minx = 0.0, maxx = 0.0, miny = 0.0, maxy = 0.0;
if(!glyph.contours.empty()) {
const Point2d &start = glyph.contours[0].points[0];
minx = maxx = start.x;
miny = maxy = start.y;
for(const VectorFont::Contour &c : glyph.contours) {
for(const Point2d &p : c.points) {
maxx = std::max(maxx, p.x);
minx = std::min(minx, p.x);
maxy = std::max(maxy, p.y);
miny = std::min(miny, p.y);
}
}
}
if(rminx) *rminx = minx;
if(rmaxx) *rmaxx = maxx;
if(rminy) *rminy = miny;
if(rmaxy) *rmaxy = maxy;
}
VectorFont VectorFont::From(std::string &&lffData) {
VectorFont font = {};
font.lffData = std::move(lffData);
ASCIIReader reader = ASCIIReader::From(font.lffData);
std::smatch m;
while(reader.TryRegex(std::regex("#\\s*(\\w+)\\s*:\\s*(.+?)\n"), &m)) {
std::string name = m.str(1),
value = m.str(2);
std::transform(name.begin(), name.end(), name.begin(), ::tolower);
if(name == "letterspacing") {
font.rightSideBearing = std::stod(value);
} else if(name == "wordspacing") {
Glyph space = {};
space.advanceWidth = std::stod(value);
font.glyphs.emplace(' ', std::move(space));
}
}
GetGlyphBBox(font.GetGlyph('A'), nullptr, nullptr, nullptr, &font.capHeight);
GetGlyphBBox(font.GetGlyph('h'), nullptr, nullptr, nullptr, &font.ascender);
GetGlyphBBox(font.GetGlyph('p'), nullptr, nullptr, &font.descender, nullptr);
ssassert(!font.IsEmpty(), "Expected to load a font");
return font;
}
const VectorFont::Glyph &VectorFont::GetGlyph(char32_t codepoint) {
auto it = glyphs.find(codepoint);
if(it != glyphs.end()) {
return (*it).second;
}
auto firstGlyph = std::find(lffData.cbegin(), lffData.cend(), '[');
ssassert(firstGlyph != lffData.cend(), "Vector font contains no glyphs");
// Find the serialized representation in the (sorted) lff file.
auto first = firstGlyph,
last = lffData.cend();
while(first <= last) {
auto mid = first + (last - first) / 2;
while(mid > first) {
if(*mid == '[' && *(mid - 1) == '\n') break;
mid--;
}
ASCIIReader reader = { mid, lffData.cend() };
if(reader.AtEnd()) break;
// Read the codepoint.
reader.ExpectChar('[');
char32_t foundCodepoint = reader.Read16HexBits();
reader.ExpectChar(']');
reader.SkipUntilEol();
if(foundCodepoint > codepoint) {
last = mid - 1;
continue; // and first stays the same
}
if(foundCodepoint < codepoint) {
first = mid + 1;
while(first != lffData.cend()) {
if(*first == '[' && *(first - 1) == '\n') break;
first++;
}
continue; // and last stays the same
}
// Found the codepoint.
VectorFont::Glyph glyph = {};
// Read glyph contours.
while(!reader.AtEnd()) {
if(reader.TryChar('\n')) {
// Skip.
} else if(reader.TryChar('[')) {
// End of glyph.
if(glyph.contours.back().points.empty()) {
// Remove an useless empty contour, if any.
glyph.contours.pop_back();
}
break;
} else if(reader.TryChar('C')) {
// Another character is referenced in this one.
char32_t baseCodepoint = reader.Read16HexBits();
const VectorFont::Glyph &baseGlyph = GetGlyph(baseCodepoint);
std::copy(baseGlyph.contours.begin(), baseGlyph.contours.end(),
std::back_inserter(glyph.contours));
} else {
Contour contour;
do {
Point2d p;
p.x = reader.ReadFloatDecimal();
reader.ExpectChar(',');
p.y = reader.ReadFloatDecimal();
if(reader.TryChar(',')) {
// Point with a bulge.
reader.ExpectChar('A');
double bulge = reader.ReadFloatDecimal();
MakePwlBulge(&contour, p, bulge);
} else {
// Just a point.
contour.points.emplace_back(std::move(p));
}
} while(reader.TryChar(';'));
reader.ExpectChar('\n');
glyph.contours.emplace_back(std::move(contour));
}
}
// Calculate metrics.
GetGlyphBBox(glyph, &glyph.leftSideBearing, &glyph.boundingWidth, nullptr, nullptr);
glyph.advanceWidth = glyph.leftSideBearing + glyph.boundingWidth + rightSideBearing;
it = glyphs.emplace(codepoint, std::move(glyph)).first;
return (*it).second;
}
// Glyph doesn't exist; return replacement glyph instead.
ssassert(codepoint != 0xfffd, "Cannot parse replacement glyph");
return GetGlyph(0xfffd);
}
VectorFont *VectorFont::Builtin() {
static VectorFont Font;
if(Font.IsEmpty()) {
Font = VectorFont::From(LoadStringFromGzip("fonts/unicode.lff.gz"));
}
return &Font;
}
double VectorFont::GetCapHeight(double forCapHeight) const {
ssassert(!IsEmpty(), "Expected a loaded font");
return forCapHeight;
}
double VectorFont::GetHeight(double forCapHeight) const {
ssassert(!IsEmpty(), "Expected a loaded font");
return (ascender - descender) * (forCapHeight / capHeight);
}
double VectorFont::GetWidth(double forCapHeight, const std::string &str) {
ssassert(!IsEmpty(), "Expected a loaded font");
double width = 0;
for(char32_t codepoint : ReadUTF8(str)) {
width += GetGlyph(codepoint).advanceWidth;
}
width -= rightSideBearing;
return width * (forCapHeight / capHeight);
}
Vector VectorFont::GetExtents(double forCapHeight, const std::string &str) {
Vector ex = {};
ex.x = GetWidth(forCapHeight, str);
ex.y = GetHeight(forCapHeight);
return ex;
}
void VectorFont::Trace(double forCapHeight, Vector o, Vector u, Vector v, const std::string &str,
const std::function<void(Vector, Vector)> &traceEdge) {
ssassert(!IsEmpty(), "Expected a loaded font");
double scale = (forCapHeight / capHeight);
u = u.ScaledBy(scale);
v = v.ScaledBy(scale);
for(char32_t codepoint : ReadUTF8(str)) {
const Glyph &glyph = GetGlyph(codepoint);
for(const VectorFont::Contour &contour : glyph.contours) {
Vector prevp;
bool penUp = true;
for(const Point2d &pt : contour.points) {
Vector p = o.Plus(u.ScaledBy(pt.x))
.Plus(v.ScaledBy(pt.y));
if(!penUp) traceEdge(prevp, p);
prevp = p;
penUp = false;
}
}
o = o.Plus(u.ScaledBy(glyph.advanceWidth));
}
}
void VectorFont::Trace(double forCapHeight, Vector o, Vector u, Vector v, const std::string &str,
const std::function<void(Vector, Vector)> &traceEdge, const Camera &camera) {
ssassert(!IsEmpty(), "Expected a loaded font");
// Perform grid-fitting only when the text is parallel to the view plane.
if(camera.gridFit && !(u.WithMagnitude(1).Equals(camera.projRight) &&
v.WithMagnitude(1).Equals(camera.projUp))) {
return Trace(forCapHeight, o, u, v, str, traceEdge);
}
double scale = forCapHeight / capHeight;
u = u.ScaledBy(scale);
v = v.ScaledBy(scale);
for(char32_t codepoint : ReadUTF8(str)) {
const Glyph &glyph = GetGlyph(codepoint);
double actualWidth = std::max(1.0, glyph.boundingWidth);
// Align (o+lsb), (o+lsb+u) and (o+lsb+v) to pixel grid.
Vector ao = o.Plus(u.ScaledBy(glyph.leftSideBearing));
Vector au = ao.Plus(u.ScaledBy(actualWidth));
Vector av = ao.Plus(v.ScaledBy(capHeight));
ao = camera.AlignToPixelGrid(ao);
au = camera.AlignToPixelGrid(au);
av = camera.AlignToPixelGrid(av);
au = au.Minus(ao).ScaledBy(1.0 / actualWidth);
av = av.Minus(ao).ScaledBy(1.0 / capHeight);
for(const VectorFont::Contour &contour : glyph.contours) {
Vector prevp;
bool penUp = true;
for(const Point2d &pt : contour.points) {
Vector p = ao.Plus(au.ScaledBy(pt.x - glyph.leftSideBearing))
.Plus(av.ScaledBy(pt.y));
if(!penUp) traceEdge(prevp, p);
prevp = p;
penUp = false;
}
}
o = o.Plus(u.ScaledBy(glyph.advanceWidth));
}
}
//-----------------------------------------------------------------------------
// Gettext plural expression evaluation
//-----------------------------------------------------------------------------