Skip to content

Optional exceptions #2

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
bazhenovc wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Optional exceptions #2

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
64 changes: 37 additions & 27 deletions gltext.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,8 @@
#include <math.h>
#include <map>

#include "gltextError.hpp"

#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
Expand Down Expand Up @@ -149,7 +151,7 @@ struct FontSystem {
static FontSystem singleton;
return singleton;
}

FontSystem() {
FT_Init_FreeType(&library);
initGlPointers();
Expand Down Expand Up @@ -186,7 +188,7 @@ struct FontSystem {


namespace gltext {

struct FontPimpl {
std::string filename;
unsigned size;
Expand Down Expand Up @@ -214,33 +216,33 @@ struct FontPimpl {
float pen_r, pen_g, pen_b;

std::map<FT_UInt, unsigned> glyphs;

void init() {
FontSystem& system = FontSystem::instance();
FT_Error error;
error = FT_New_Face(system.library, filename.c_str(), 0, &face);
if(error) {
throw FtException();
Error::throwError<FtException>();
}
error = FT_Set_Pixel_Sizes(face, 0, size);
if(error) {
FT_Done_Face(face);
throw FtException();
Error::throwError<FtException>();
}

font = hb_ft_font_create(face, 0);

double size_y = double(face->height) * double(face->size->metrics.y_ppem) / double(face->units_per_EM);
double size_x = double(face->max_advance_width) * double(face->size->metrics.y_ppem) / double(face->units_per_EM);
y_size = ceil(size_y);
x_size = ceil(size_x);

texpos_x = 0;
texpos_y = 0;
num_glyphs_cached = 0;

short max_glyphs = (cache_w / x_size)*(cache_h / y_size);

gltextGenVertexArrays(1, &vao);
gltextGenBuffers(1, &vbo);
gltextGenBuffers(1, &ibo);
Expand All @@ -253,7 +255,7 @@ struct FontPimpl {
gltextEnableVertexAttribArray(1);
gltextVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), 0);
gltextVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4*sizeof(float), (GLvoid*)(2*sizeof(float)));

gltextActiveTexture(GL_TEXTURE0);
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
Expand All @@ -275,32 +277,32 @@ struct FontPimpl {
std::map<FT_UInt, unsigned>::iterator cacheGlyph(FT_UInt codepoint)
{
if(num_glyphs_cached == (cache_w / x_size)*(cache_h / y_size)) {
throw CacheOverflowException();
Error::throwError<CacheOverflowException>();
}
FT_Error error;
error = FT_Load_Glyph(face, codepoint, FT_LOAD_RENDER);
if(error) {
throw FtException();
Error::throwError<FtException>();
}
if(face->glyph->bitmap.pixel_mode != FT_PIXEL_MODE_GRAY) {
throw BadFontFormatException();
Error::throwError<BadFontFormatException>();
}
int pitch = face->glyph->bitmap.pitch;
bool need_inverse_texcoords = true;
if(pitch < 0) {
pitch = -pitch;
need_inverse_texcoords = false;
}
}
glPixelStorei(GL_UNPACK_ROW_LENGTH, pitch);
if(texpos_x + face->glyph->bitmap.width > cache_w) {
texpos_x = 0;
texpos_y += y_size;
}
glTexSubImage2D(GL_TEXTURE_2D, 0, texpos_x, texpos_y, face->glyph->bitmap.width, face->glyph->bitmap.rows, GL_RED, GL_UNSIGNED_BYTE, face->glyph->bitmap.buffer);

float hori_offset = face->glyph->bitmap_left;
float vert_offset = face->glyph->bitmap_top - face->glyph->bitmap.rows;

GlyphVert corners[4];
GlyphVert& bl = corners[0];
GlyphVert& ul = corners[1];
Expand Down Expand Up @@ -349,13 +351,17 @@ Font::Font(std::string font_file, unsigned size, unsigned cache_w, unsigned cach
self->pen_x = 0;
self->pen_y = 0;
self->pen_r = self->pen_g = self->pen_b = 1.0f;
#ifdef GLTEXT_NO_EXCEPTIONS
self->init();
#else
try {
self->init();
} catch(Exception&) {
delete self;
self = 0;
throw;
}
#endif
}

Font::Font()
Expand Down Expand Up @@ -396,33 +402,37 @@ Font& Font::operator=(const Font& rhs) {
COPY_VAL(pen_r);
COPY_VAL(pen_g);
COPY_VAL(pen_b);
#ifdef GLTEXT_NO_EXCEPTIONS
self->init();
#else
try {
self->init();
} catch(Exception&) {
delete self;
self = 0;
throw;
}
#endif
return *this;
}

void Font::setDisplaySize(unsigned w, unsigned h) {
if(!self)
throw EmptyFontException();
Error::throwError<EmptyFontException>();
self->window_w = w;
self->window_h = h;
}

void Font::setPenPosition(unsigned x, unsigned y) {
if(!self)
throw EmptyFontException();
Error::throwError<EmptyFontException>();
self->pen_x = x;
self->pen_y = y;
}

void Font::setPenColor(float r, float g, float b) {
if(!self)
throw EmptyFontException();
Error::throwError<EmptyFontException>();
self->pen_r = r;
self->pen_g = g;
self->pen_b = b;
Expand All @@ -438,12 +448,12 @@ void Font::setPointSize(unsigned int size) {

void Font::cacheCharacters(std::string chars) {
if(!self)
throw EmptyFontException();
Error::throwError<EmptyFontException>();
hb_buffer_t* buffer = hb_buffer_create();
hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
hb_buffer_add_utf8(buffer, chars.c_str(), chars.size(), 0, chars.size());
hb_shape(self->font, buffer, NULL, 0);

unsigned len = hb_buffer_get_length(buffer);
hb_glyph_info_t* glyphs = hb_buffer_get_glyph_infos(buffer, 0);
hb_glyph_position_t* positions = hb_buffer_get_glyph_positions(buffer, 0);
Expand All @@ -453,7 +463,7 @@ void Font::cacheCharacters(std::string chars) {
gltextBindVertexArray(self->vao);

glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

for(unsigned i = 0; i < len; i++) {
std::map<FT_UInt, unsigned>::iterator g = self->glyphs.find(glyphs[i].codepoint);
if(g == self->glyphs.end()) {
Expand All @@ -464,7 +474,7 @@ void Font::cacheCharacters(std::string chars) {

void Font::draw(std::string text) {
if(!self)
throw EmptyFontException();
Error::throwError<EmptyFontException>();
hb_buffer_t* buffer = hb_buffer_create();
hb_buffer_set_direction(buffer, HB_DIRECTION_LTR);
hb_buffer_add_utf8(buffer, text.c_str(), text.size(), 0, text.size());
Expand All @@ -490,12 +500,12 @@ void Font::draw(std::string text) {
}

unsigned glyph = g->second;

gltextUniform2i(FontSystem::instance().pos_loc, self->pen_x+positions[i].x_offset, self->pen_y+positions[i].y_offset);
glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, (GLvoid*)(glyph*GLYPH_IDX_SIZE));
self->pen_x += positions[i].x_advance >> 6;
self->pen_y += positions[i].y_advance >> 6;
}
}
}

}
}
32 changes: 32 additions & 0 deletions gltextError.hpp
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,32 @@
#ifndef GLTEXTERROR_HPP
#define GLTEXTERROR_HPP

namespace gltext
{

#define GLTEXT_ERROR_STRING(X) #X

/**
* Runtime error in case we don`t have exception support
*/
class Error
{
public:

/**
* Throw an error
*/
template <typename T>
static void throwError()
{
#ifndef GLTEXT_NO_EXCEPTIONS
throw T();
#else
assert(false && "Exception: " GLTEXT_ERROR_STRING(T));
#endif
}
};

}

#endif // GLTEXTERROR_HPP