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#include "TextRasterizer.h"
#include <string>
#include <cmath>
#include <limits>
#include <iostream>
#include "../../environment/Environment.h"
TextRasterizer::TextRasterizer(const std::string &fontPath, const int size, const unsigned int resolution, const bool bold) {
fontSize = size;
FT_Init_FreeType(&lib);
face = std::make_unique<FT_Face>();
std::string path = Environment::getResourceDir() + "/" + fontPath;
//std::cout << "font path [" << path << "]" << std::endl;
if (bold) {
path = path.substr(0, path.length() -4) + "-Bold.ttf";
}
//std::cout << "font path [" << path << "]" << std::endl;
if (FT_New_Face(lib, path.c_str(), 0, face.get())) {
std::cout << "Could not open font, bold: " << bold << std::endl;
return;
}
if (!isUnicodeBMP(*face)) {
std::cout << "Font is not Unicode BMP" << std::endl;
return;
}
if (FT_Set_Char_Size(*face, 0, fontSize * 64, resolution, resolution)) {
std::cout << "Could not set font size" << std::endl;
return;
}
font = hb_ft_font_create(*face, nullptr);
buffer = hb_buffer_create();
if (!hb_buffer_allocation_successful(buffer)) {
std::cout << "Could not create HarfBuzz buffer" << std::endl;
return;
}
}
TextRasterizer::~TextRasterizer() {
hb_buffer_destroy(buffer);
hb_font_destroy(font);
FT_Done_FreeType(lib);
}
std::unique_ptr<std::pair<int, int>> TextRasterizer::size(const rasterizationRequest &request) const {
if (!request.availableWidth) {
// window is likely minimized, so no output
return nullptr;
}
if (request.startX == request.availableWidth) {
std::cout << "TextRasterizer::size - x [" << static_cast<int>(request.startX) << "] matches window width [" << static_cast<int>(request.availableWidth)<< "] for text[" << request.text << "] no room to render anything" << std::endl;
return nullptr;
}
if (request.startX > request.availableWidth) {
std::cout << "TextRasterizer::size - x [" << static_cast<int>(request.startX) << "] requested outside of window width [" << static_cast<int>(request.availableWidth)<< "] for text[" << request.text << "]" << std::endl;
return nullptr;
}
if (!buffer) {
std::cout << "TextRasterizer::rasterize - no font loaded" << std::endl;
return nullptr;
}
unsigned int glyphCount;
hb_buffer_reset(buffer);
hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
hb_buffer_set_language(buffer, hb_language_from_string("en", 2));
hb_buffer_add_utf8(buffer, request.text.c_str(), request.text.length(), 0, request.text.length());
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wold-style-cast"
const hb_feature_t KerningOn = { HB_TAG('k', 'e', 'r', 'n'), 1, 0, std::numeric_limits<unsigned int>::max() };
#pragma GCC diagnostic pop
hb_shape(font, buffer, &KerningOn, 1);
const hb_glyph_info_t *glyphInfo = hb_buffer_get_glyph_infos(buffer, &glyphCount);
const hb_glyph_position_t *glyphPos = hb_buffer_get_glyph_positions(buffer, &glyphCount);
std::unique_ptr<rasterizationResponse> response = std::make_unique<rasterizationResponse>();
// figure out width/height
int cx = 0;
int cy = 0;
int xmax = 0;
int y0max = 0, y1max = 0;
int lines = 1;
response->wrapped = false;
int lineXStart = request.startX;
int leftPadding = 0;
int wrapToX = 0;
for (unsigned int i = 0; i < glyphCount; i++) {
if (FT_Load_Glyph(*face, glyphInfo[i].codepoint, FT_LOAD_DEFAULT)) {
std::cout << "Could not load glyph" << std::endl;
return nullptr;
}
const FT_GlyphSlot slot = (*face)->glyph;
if (FT_Render_Glyph(slot, FT_RENDER_MODE_NORMAL)) {
std::cout << "Could not render glyph" << std::endl;
return nullptr;
}
// how much space does this character take
const float xa = static_cast<float>(glyphPos[i].x_advance) / 64;
const float ya = static_cast<float>(glyphPos[i].y_advance) / 64; //mostly 0s
// do we need to padding the texture to the left for any lines
if (cx == 0) {
if (slot->bitmap_left < 0) {
// figure out max amount of padding we need
leftPadding = std::max(leftPadding, -slot->bitmap_left);
}
}
// wrap to next line on width
if (cx + lineXStart >= request.availableWidth) {
response->wrapped = true;
if (request.noWrap) {
glyphCount = i;
} else {
//std::cout << "multine text: [" << text << "] new line:" << cy << " x: " << (int)x << "+ cx:" << (int)cx << std::endl;
//std::cout << "line #" << lines << " starts at " << lineXStart << " ends at " << lineXStart + cx << std::endl;
xmax = request.availableWidth - wrapToX; // the whole width of parent to the edge of windowWidth
//std::cout << "new width: " << xmax << std::endl;
cx = wrapToX; // wrapToX (was 0) (was -= xmax)
cy -= std::ceil(1.2f * fontSize); // 1.2 scalar from https://developer.mozilla.org/en-US/docs/Web/CSS/line-height
lines++;
lineXStart = wrapToX; // change where we start
}
}
//std::cout << "glyph:" << xa << "x" << ya << std::endl;
// update glyph space allocation
cx += xa;
cy += ya; // is normal for y0 at bottom
// update glyph maxes
const FT_Bitmap ftBitmap = slot->bitmap;
const float yo = static_cast<float>(glyphPos[i].y_offset) / 64;
int y0 = static_cast<int>(floor(yo + slot->bitmap_top));
int y1 = y0 + static_cast<int>(ftBitmap.rows);
y0max=std::max(y0max, y0);
y1max=std::max(y1max, y1);
// track new max width
xmax=std::max(xmax, cx);
}
if (leftPadding) {
xmax+=leftPadding; // increase width;
}
// at least one line
cy -= std::ceil(1.2f * fontSize); // 1.2 scalar from https://developer.mozilla.org/en-US/docs/Web/CSS/line-height
response->height = -cy;
response->width = xmax;
//std::cout << "lines: " << lines << " wrapToX: " << wrapToX << " startX: " << x << " xmax: " << xmax << std::endl;
//std::cout << "y1max: " << y1max << " lines: " << lines << std::endl;
y1max *= lines;
//std::cout << "initial:" << (int)width << "x" << (int)height << std::endl;
if (response->height < y1max) {
response->height = y1max;
//std::cout << "adjusted:" << (int)width << "x" << (int)height << std::endl;
}
// FIXME: how about endingX,Y?
return std::make_unique<std::pair<int, int>>(std::pair<int, int>(response->width, response->height));
}
#include <GL/glew.h>
std::unique_ptr<rasterizationResponse> TextRasterizer::rasterize(const rasterizationRequest &request) const {
if (request.startX == request.availableWidth) {
std::cout << "TextRasterizer::rasterize - x [" << static_cast<int>(request.startX) << "] matches window width [" << static_cast<int>(request.availableWidth)<< "] for text[" << request.text << "] no room to render anything" << std::endl;
return nullptr;
}
if (request.startX > request.availableWidth) {
std::cout << "TextRasterizer::rasterize - x [" << static_cast<int>(request.startX) << "] requested outside of window width [" << static_cast<int>(request.availableWidth)<< "] for text[" << request.text << "]" << std::endl;
return nullptr;
}
if (!buffer) {
std::cout << "TextRasterizer::rasterize - no font loaded" << std::endl;
return nullptr;
}
unsigned int glyphCount;
hb_buffer_reset(buffer);
hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
hb_buffer_set_language(buffer, hb_language_from_string("en", 2));
hb_buffer_add_utf8(buffer, request.text.c_str(), request.text.length(), 0, request.text.length());
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wold-style-cast"
const hb_feature_t KerningOn = { HB_TAG('k', 'e', 'r', 'n'), 1, 0, std::numeric_limits<unsigned int>::max() };
#pragma GCC diagnostic pop
hb_shape(font, buffer, &KerningOn, 1);
const hb_glyph_info_t *glyphInfo = hb_buffer_get_glyph_infos(buffer, &glyphCount);
const hb_glyph_position_t *glyphPos = hb_buffer_get_glyph_positions(buffer, &glyphCount);
std::unique_ptr<rasterizationResponse> response = std::make_unique<rasterizationResponse>();
// figure out width/height
int cx = 0;
int cy = 0;
int xmax = 0;
int y0max = 0, y1max = 0;
int lines = 1;
response->wrapped = false;
int lineXStart = request.startX;
int leftPadding = 0;
int wrapToX = 0;
for (unsigned int i = 0; i < glyphCount; i++) {
if (FT_Load_Glyph(*face, glyphInfo[i].codepoint, FT_LOAD_DEFAULT)) {
std::cout << "Could not load glyph" << std::endl;
return nullptr;
}
const FT_GlyphSlot slot = (*face)->glyph;
if (FT_Render_Glyph(slot, FT_RENDER_MODE_NORMAL)) {
std::cout << "Could not render glyph" << std::endl;
return nullptr;
}
// how much space does this character take
const float xa = static_cast<float>(glyphPos[i].x_advance) / 64;
const float ya = static_cast<float>(glyphPos[i].y_advance) / 64; //mostly 0s
// do we need to padding the texture to the left for any lines
if (cx == 0) {
if (slot->bitmap_left < 0) {
// figure out max amount of padding we need
leftPadding = std::max(leftPadding, -slot->bitmap_left);
}
}
// wrap to next line on width
if ((cx + lineXStart) - request.sourceStartX >= request.availableWidth) {
response->wrapped = true;
if (request.noWrap) {
std::cout << "TextRasterizer::rasterize - we've hit wrap & noWrap at " << cx << " + " << lineXStart << " < " << request.availableWidth << std::endl;
// we can only fit partial of the last char
std::cout << "TextRasterizer::rasterize - truncating " << glyphCount << " char(s) to " << i << " char(s)" << std::endl;
glyphCount = i;
// we're done
break;
} else {
//std::cout << "multine text: [" << text << "] new line:" << cy << " x: " << (int)x << "+ cx:" << (int)cx << std::endl;
//std::cout << "line #" << lines << " starts at " << lineXStart << " ends at " << lineXStart + cx << std::endl;
xmax = request.availableWidth - wrapToX; // the whole width of parent to the edge of windowWidth
//std::cout << "new width: " << xmax << std::endl;
cx = wrapToX; // wrapToX (was 0) (was -= xmax)
cy -= std::ceil(1.2f * fontSize); // 1.2 scalar from https://developer.mozilla.org/en-US/docs/Web/CSS/line-height
lines++;
lineXStart = wrapToX; // change where we start
}
}
//std::cout << "glyph:" << xa << "x" << ya << std::endl;
// update glyph space allocation
cx += xa;
cy += ya; // is normal for y0 at bottom
// update glyph maxes
const FT_Bitmap ftBitmap = slot->bitmap;
const float yo = static_cast<float>(glyphPos[i].y_offset) / 64;
int y0 = static_cast<int>(floor(yo + slot->bitmap_top));
int y1 = y0 + static_cast<int>(ftBitmap.rows);
y0max=std::max(y0max, y0);
y1max=std::max(y1max, y1);
// track new max width
xmax=std::max(xmax, cx);
}
//std::cout << "TextRasterizer::rasterize - xmax exits loop at " << xmax << std::endl;
if (leftPadding) {
//std::cout << "TextRasterizer::rasterize - leftPadding " << leftPadding << std::endl;
xmax += leftPadding; // increase width;
}
// at least one line
cy -= std::ceil(1.2f * fontSize); // 1.2 scalar from https://developer.mozilla.org/en-US/docs/Web/CSS/line-height
//std::cout << "TextRasterizer::rasterize - initial width " << xmax << std::endl;
response->width = xmax;
response->height = -cy;
//std::cout << "lines: " << lines << " wrapToX: " << wrapToX << " startX: " << x << " xmax: " << xmax << std::endl;
//std::cout << "y1max: " << y1max << " lines: " << lines << std::endl;
y1max *= lines;
//std::cout << "initial:" << (int)width << "x" << (int)height << std::endl;
if (response->height < y1max) {
response->height = y1max;
//std::cout << "adjusted:" << (int)width << "x" << (int)height << std::endl;
}
// adjust sourceStart
//std::cout << "TextRasterizer::rasterize - adjust sourceStart: " << request.sourceStartX << "," << request.sourceStartY << std::endl;
response->width -= request.sourceStartX;
response->height -= request.sourceStartY;
//std::cout << "TextRasterizer::rasterize - final:" << static_cast<int>(response->width) << "x" << static_cast<int>(response->height) << std::endl;
/*
if (xmax==windowWidth - x) {
std::cout << "Wrapped text[" << text << "] over " << lines << " lines " << xmax << "x" << static_cast<int>(height) << std::endl;
}
*/
//std::cout << "text size: " << (int)width << "x" << (int)height << std::endl;
response->textureWidth = pow(2, ceil(log(response->width) / log(2)));
response->textureHeight = pow(2, ceil(log(response->height) / log(2)));
//std::cout << "text texture size:" << line->textureWidth << "x" << line->textureHeight << std::endl;
size_t size = static_cast<size_t>(response->textureWidth * response->textureHeight); // here?
response->textureData = std::make_unique<unsigned char[]>(size); // here?
if (!response->textureData) {
std::cout << "failed to create texture" << static_cast<int>(response->width) << "X" << static_cast<int>(response->height) << std::endl;
return nullptr;
}
// translation information
response->x0 = -leftPadding; // wrap to element start (wrapToX (0) or x)
response->y0 = 0;
response->x1 = -leftPadding + response->width;
response->y1 = -response->height;
//std::cout << "xd: " << static_cast<int>(response->x1-response->x0) << " yd: " << static_cast<int>(response->y0-response->y1) << std::endl;
//std::cout << "Requesting texture of " << response->textureWidth << "x" << response->textureHeight << "max: " << win->maxTextureSize << std::endl;
if (response->textureHeight > request.maxTextureSize) {
std::cout << "Truncating text texture height to fit in your video card: " << response->textureHeight << ">" << request.maxTextureSize << std::endl;
response->textureHeight = request.maxTextureSize;
}
// texture coords
response->s0 = 0.0f;
response->t0 = 0.0f;
response->s1 = response->width / response->textureWidth;
response->t1 = response->height / response->textureHeight;
//std::cout << "s1: " << response->s1 << " t1: " << response->t1 << std::endl;
// copy all glyphs into one single glyph
// still neds to start at X
cx = response->wrapped ? request.startX : 0; // reset
cy = 0;
//std::cout << "[" << request.text << "] wrapped? " << response->wrapped << " starting at: " << cx << std::endl;
//int miny0 = 99;
int maxy0 = 0;
for (unsigned int i = 0; i < glyphCount; i++) {
if (FT_Load_Glyph(*face, glyphInfo[i].codepoint, FT_LOAD_DEFAULT)) {
std::cout << "Could not load glyph" << std::endl;
return nullptr;
}
const FT_GlyphSlot slot = (*face)->glyph;
if (FT_Render_Glyph(slot, FT_RENDER_MODE_NORMAL)) {
std::cout << "Could not render glyph" << std::endl;
return nullptr;
}
const FT_Bitmap ftBitmap = slot->bitmap;
// figure out glyph starting point
const float yo = static_cast<float>(glyphPos[i].y_offset) / 64;
int y0 = static_cast<int>(floor(yo + slot->bitmap_top));
//miny0 = std::min(y0, miny0);
maxy0 = std::max(y0, maxy0);
int bump = y0max - y0; // Y adjust for this glyph
const float xa = static_cast<float>(glyphPos[i].x_advance) / 64;
// if this char is too width for this line, advance to next line
if (!request.noWrap && cx + xa >= request.availableWidth) {
cx = wrapToX;
cy += std::ceil(1.2f * fontSize);// 1.2 scalar from https://developer.mozilla.org/en-US/docs/Web/CSS/line-height
//std::cout << "textWrap - cx reset to: " << cx << " cy is now: " << cy << std::endl;
}
//std::cout << "placing glyph[" << text[i] << "] at " << cx << " cy is now: " << cy << std::endl;
if (cx < request.sourceStartX) {
// skip ahead
cx += xa;
continue;
}
// place glyph bitmap data into texture
for (unsigned int iy = 0; iy < ftBitmap.rows; iy++) { // line by line
// source is 0 to (0:iy:rows)
// dest is cx+bl, (0:iy:rows)+(0:cy:height)+bump
//std::cout << "placing glyph row at " << (cx + slot->bitmap_left) << "x" << ((iy + cy) + bump) << std::endl;
unsigned int destPos = static_cast<unsigned int>(cx - request.sourceStartX + leftPadding + slot->bitmap_left) + ((iy + static_cast<unsigned int>(cy - request.sourceStartY)) + static_cast<unsigned int>(bump)) * response->textureWidth;
if (destPos >= size) {
// we're done with this line
continue;
}
unsigned char *src = ftBitmap.buffer + iy * static_cast<unsigned int>(ftBitmap.width);
unsigned char *dest = response->textureData.get() + destPos;
for(unsigned int ix = 0; ix < ftBitmap.width; ix++) { // pixel by pixel
if (destPos + ix >= size) {
// we're done with this line
continue;
}
//std::cout << "putting:" << (int)src[ix] << " over " << (int)dest[ix] << std::endl;
if (src[ix] && src[ix]>dest[ix]) {
dest[ix]=src[ix];
}
}
}
cx += xa;
}
//std::cout << "final size: " << (int)width << "x" << (int)height << std::endl;
//std::cout << "at: " << (int)line->x0 << "x" << (int)line->y0 << " to: " << (int)line->x1 << "x" << (int)line->y1 <<std::endl;
response->endingX = cx - request.sourceStartX; // maybe should be one xa less?
//std::ceil(0.5 * 1.2f * fontSize)+2
// should this be - request.sourceStartY?
response->endingY = cy + maxy0 + request.sourceStartY; // definitely should be one lineheight higher
//std::cout << "ending at " << response->endingX << "," << response->endingY << std::endl;
return response;
}
bool TextRasterizer::isUnicodeBMP(const FT_Face &ftFace) const {
for (int i = 0; i < ftFace->num_charmaps; i++) {
if (((ftFace->charmaps[i]->platform_id == 0) && (ftFace->charmaps[i]->encoding_id == 3)) || ((ftFace->charmaps[i]->platform_id == 3) && (ftFace->charmaps[i]->encoding_id == 1))) {
FT_Set_Charmap(ftFace, ftFace->charmaps[i]);
return true;
}
}
return false;
}