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// Gmsh - Copyright (C) 1997-2021 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file for license information. Please report all
// issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
//
// Contributed by Jonathan Lambrechts
#include "drawContextFltkStringTexture.h"
#include <algorithm>
// FIXME: hack for current version of mingw
#if defined(WIN32) && !defined(GL_TEXTURE_RECTANGLE_ARB)
#define GL_TEXTURE_RECTANGLE_ARB 0x84F5
#endif
class drawContextFltkStringTexture::queueString {
public:
typedef struct {
std::string text;
GLfloat x, y, z;
GLfloat r, g, b, alpha;
int fontSize, fontId;
int width;
int height;
} element;
private:
std::vector<element> _elements;
int _totalWidth, _maxHeight;
public:
queueString()
{
_totalWidth = 0;
_maxHeight = 0;
}
void append(const element &elem)
{
if(_totalWidth + elem.width > 1000) flush();
_elements.push_back(elem);
_totalWidth += elem.width;
_maxHeight = std::max(_maxHeight, elem.height);
}
void flush()
{
if(_elements.empty()) return;
// 1000 should be _totalWidth but it does not work
int w = 1000, h = _maxHeight;
Fl_Offscreen offscreen = fl_create_offscreen(w, h);
fl_begin_offscreen(offscreen);
fl_color(0, 0, 0);
fl_rectf(0, 0, w, h);
fl_color(255, 255, 255);
int pos = 0;
for(auto it = _elements.begin(); it != _elements.end(); ++it) {
fl_font(it->fontId, it->fontSize);
fl_draw(it->text.c_str(), pos, it->height - fl_descent());
pos += it->width;
}
uchar *data = fl_read_image(nullptr, 0, 0, w, h);
for(int i = 0; i < w * h; ++i) { data[i] = data[i * 3]; }
fl_end_offscreen();
fl_delete_offscreen(offscreen);
// setup matrices
GLint matrixMode;
GLuint textureId;
glGetIntegerv(GL_MATRIX_MODE, &matrixMode);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
// FIXME: this is not correct with high-resolution graphics, as w(), h() are
// in FLTK coordinates, and glRasterPos uses true pixels.
// The size of the QUAD needs to be changed, too.
float winw = Fl_Window::current()->w();
float winh = Fl_Window::current()->h();
glScalef(2.0f / winw, 2.0f / winh, 1.0f);
glTranslatef(-winw / 2.0f, -winh / 2.0f, 0.0f);
// write the texture on screen
glEnable(GL_TEXTURE_RECTANGLE_ARB);
glPushAttrib(GL_ENABLE_BIT | GL_TEXTURE_BIT | GL_COLOR_BUFFER_BIT);
glDisable(GL_LIGHTING);
glDisable(GL_DEPTH_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glGenTextures(1, &textureId);
glBindTexture(GL_TEXTURE_RECTANGLE_ARB, textureId);
glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_ALPHA, w, h, 0, GL_ALPHA,
GL_UNSIGNED_BYTE, data);
// glTexEnvi (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_SRC0_ALPHA);
// printf("error %i %s\n", __LINE__, gluErrorString(glGetError()));
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
pos = 0;
for(auto it = _elements.begin(); it != _elements.end(); ++it) {
glTranslatef(it->x, it->y, it->z);
glColor4f(it->r, it->g, it->b, it->alpha);
int Lx = it->width;
int Ly = it->height;
glBegin(GL_QUADS);
glTexCoord2f(pos, 0);
glVertex2f(0.0f, Ly);
glTexCoord2f(pos + Lx, 0);
glVertex2f(Lx, Ly);
glTexCoord2f(pos + Lx, Ly);
glVertex2f(Lx, 0.0f);
glTexCoord2f(pos, Ly);
glVertex2f(0.0f, 0.0f);
glEnd();
pos += Lx;
glTranslatef(-it->x, -it->y, -it->z);
}
glDeleteTextures(1, &textureId);
glPopAttrib();
// reset original matrices
glPopMatrix(); // GL_MODELVIEW
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(matrixMode);
_elements.clear();
_maxHeight = 0;
_totalWidth = 0;
delete[] data;
}
};
void drawContextFltkStringTexture::flushString() { _queue->flush(); }
// ensure the surface is large enough
void drawContextFltkStringTexture::drawString(const char *str)
{
GLfloat pos[4], color[4];
glGetFloatv(GL_CURRENT_RASTER_POSITION, pos);
glGetFloatv(GL_CURRENT_COLOR, color);
queueString::element elem = {str,
pos[0],
pos[1],
pos[2],
color[0],
color[1],
color[2],
color[3],
_currentFontSize,
_currentFontId,
(int)getStringWidth(str) + 1,
getStringHeight()};
_queue->append(elem);
}
drawContextFltkStringTexture::~drawContextFltkStringTexture() { delete _queue; }
drawContextFltkStringTexture::drawContextFltkStringTexture()
{
_queue = new queueString;
}
void drawContextFltkStringTexture::setFont(int fontid, int fontsize)
{
drawContextFltk::setFont(fontid, fontsize);
_currentFontId = fontid;
_currentFontSize = fontsize;
}
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