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fltk/test/unittest_images.cxx

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//
// Unit tests for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2022 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
#include "unittests.h"
#include <FL/Fl_Group.H>
#include <FL/Fl_Button.H>
#include <FL/Fl_Radio_Button.H>
#include <FL/Fl_Check_Button.H>
#include <FL/fl_draw.H>
#include <stdlib.h>
// Note: currently (March 2010) fl_draw_image() supports transparency with
// alpha channel only on Apple (Mac OS X), but Fl_RGB_Image->draw()
// supports transparency on all platforms !
//
//------- test the image drawing capabilities of this implementation ----------
//
// Parameters for fine tuning for developers.
// Default values: CB=1, DX=0, IMG=1, LX=0, FLIPH=0
static int cb = 1; // 1 to show the checker board background for alpha images,
// 0 otherwise
static int dx = 0; // additional (undefined (0)) pixels per line, must be >= 0
// ignored (irrelevant), if LX == 0 (see below)
static int img = 1; // 1 to use Fl_RGB_Image for drawing images with transparency,
// 0 to use fl_draw_image() instead.
// Note: as of Feb 2016, only 1 (Fl_RGB_Image) works with
// alpha channel, 0 (fl_draw_image()) ignores the alpha
// channel (FLTK 1.3.x).
// There are plans to support transparency (alpha channel)
// in fl_draw_image() in FLTK 1.4.0 and/or later.
static int lx = 0; // 0 for default: ld() = 0, i.e. ld() defaults (internally) to w()*d()
// +1: ld() = (w() + DX) * d()
// -1 to flip image vertically: ld() = - ((w() + DX) * d())
static int flip_h = 0; // 1 = Flip image horizontally (only if IMG == 0)
// 0 = Draw image normal, w/o horizontal flipping
// ----------------------------------------------------------------------
// Test scenario for fl_draw_image() with pos. and neg. d and ld args:
// ----------------------------------------------------------------------
// (1) set img = 0: normal, but w/o transparency: no checker board
// (2) set lx = -1: images flipped vertically
// (3) set flip_h = 1: images flipped vertically and horizontally
// (4) set lx = 0: images flipped horizontally
// (5) set flip_h = 0, IMG = 1: back to default (with transparency)
// ----------------------------------------------------------------------
class Ut_Image_Test : public Fl_Group {
static void build_imgs() {
int x, y;
uchar *dg, *dga, *drgb, *drgba;
dg = img_gray = img_gray_base = (uchar*)malloc((128+dx)*128*1);
dga = img_gray_a = img_gray_a_base = (uchar*)malloc((128+dx)*128*2);
drgb = img_rgb = img_rgb_base = (uchar*)malloc((128+dx)*128*3);
drgba = img_rgba = img_rgba_base = (uchar*)malloc((128+dx)*128*4);
for (y=0; y<128; y++) {
for (x=0; x<128; x++) {
*drgba++ = *drgb++ = *dga++ = *dg++ = y<<1;
*drgba++ = *drgb++ = x<<1;
*drgba++ = *drgb++ = (127-x)<<1;
*drgba++ = *dga++ = x+y;
}
if (dx > 0 && lx != 0) {
memset(dg, 0,1*dx); dg += 1*dx;
memset(dga, 0,2*dx); dga += 2*dx;
memset(drgb, 0,3*dx); drgb += 3*dx;
memset(drgba,0,4*dx); drgba += 4*dx;
}
}
if (lx<0) {
img_gray += 127*(128+dx);
img_gray_a += 127*(128+dx)*2;
img_rgb += 127*(128+dx)*3;
img_rgba += 127*(128+dx)*4;
}
if (flip_h && !img ) {
img_gray += 127;
img_gray_a += 127*2;
img_rgb += 127*3;
img_rgba += 127*4;
}
i_g = new Fl_RGB_Image (img_gray ,128,128,1,lx*(128+dx));
i_ga = new Fl_RGB_Image (img_gray_a,128,128,2,lx*(128+dx)*2);
i_rgb = new Fl_RGB_Image (img_rgb, 128,128,3,lx*(128+dx)*3);
i_rgba = new Fl_RGB_Image (img_rgba, 128,128,4,lx*(128+dx)*4);
} // build_imgs method ends
void free_images() {
if (i_rgba) { delete i_rgba; i_rgba = 0; }
if (i_rgb) { delete i_rgb; i_rgb = 0; }
if (i_ga) { delete i_ga; i_ga = 0; }
if (i_g) { delete i_g; i_g = 0; }
if (img_rgba_base) { free (img_rgba_base); img_rgba_base = 0; }
if (img_rgb_base) { free (img_rgb_base); img_rgb_base = 0; }
if (img_gray_a_base) { free (img_gray_a_base); img_gray_a_base = 0; }
if (img_gray_base) { free (img_gray_base); img_gray_base = 0; }
} // end of free_images method
static void refresh_imgs_CB(Fl_Widget*,void *data) {
Ut_Image_Test* it = (Ut_Image_Test*)data;
it->free_images(); // release the previous images
// determine the state for the next images
cb = it->ck_CB->value();
img = it->ck_IMG->value();
flip_h = it->ck_FLIPH->value();
// read the LX state radio buttons
if (it->rb_LXp1->value()) { lx = 1; }
else if (it->rb_LXm1->value()) { lx = (-1); }
else { lx = 0; }
// construct the next images
build_imgs();
it->redraw();
}
public:
static Fl_Widget *create() {
build_imgs();
return new Ut_Image_Test(UT_TESTAREA_X, UT_TESTAREA_Y, UT_TESTAREA_W, UT_TESTAREA_H);
} // create method ends
static uchar *img_gray_base;
static uchar *img_gray_a_base;
static uchar *img_rgb_base;
static uchar *img_rgba_base;
static uchar *img_gray;
static uchar *img_gray_a;
static uchar *img_rgb;
static uchar *img_rgba;
static Fl_RGB_Image *i_g;
static Fl_RGB_Image *i_ga;
static Fl_RGB_Image *i_rgb;
static Fl_RGB_Image *i_rgba;
// control widgets
Fl_Group *ctr_grp;
Fl_Check_Button *ck_CB;
Fl_Check_Button *ck_IMG;
Fl_Check_Button *ck_FLIPH;
Fl_Radio_Button *rb_LXm1;
Fl_Radio_Button *rb_LX0;
Fl_Radio_Button *rb_LXp1;
Fl_Button *refresh;
Ut_Image_Test(int x, int y, int w, int h)
: Fl_Group(x, y, w, h)
{
label("Testing Image Drawing\n\n"
"This test renders four images, two of them with a checker board\n"
"visible through the graphics. Color and gray gradients should be\n"
"visible. This does not test any image formats such as JPEG.");
align(FL_ALIGN_INSIDE|FL_ALIGN_BOTTOM|FL_ALIGN_LEFT|FL_ALIGN_WRAP);
box(FL_BORDER_BOX);
int cw = 90;
int ch = 200;
int cx = x + w - cw - 5;
int cy = y + 10;
ctr_grp = new Fl_Group(cx, cy, cw, ch);
ck_CB = new Fl_Check_Button(cx+10, cy+10, cw-20, 30, "CB");
ck_CB->callback(refresh_imgs_CB, (void*)this);
ck_CB->value(cb);
ck_CB->tooltip("1 to show the checker board background for alpha images,\n"
"0 otherwise");
ck_IMG = new Fl_Check_Button(cx+10, cy+40, cw-20, 30, "IMG");
ck_IMG->callback(refresh_imgs_CB, (void*)this);
ck_IMG->value(img);
ck_IMG->tooltip("1 to use Fl_RGB_Image for drawing images with transparency,\n"
"0 to use fl_draw_image() instead.");
ck_FLIPH = new Fl_Check_Button(cx+10, cy+70, cw-20, 30, "FLIPH");
ck_FLIPH->callback(refresh_imgs_CB, (void*)this);
ck_FLIPH->value(flip_h);
ck_FLIPH->tooltip("1 = Flip image horizontally (only if IMG == 0)\n"
"0 = Draw image normal, w/o horizontal flipping");
Fl_Group *rd_grp = new Fl_Group(cx+10, cy+100, cw-20, 90, "LX");
rb_LXp1 = new Fl_Radio_Button(cx+15, cy+105, cw-30, 20, "+1");
rb_LXp1->callback(refresh_imgs_CB, (void*)this);
rb_LX0 = new Fl_Radio_Button(cx+15, cy+125, cw-30, 20, "0");
rb_LX0->callback(refresh_imgs_CB, (void*)this);
rb_LX0->tooltip("0 for default: ld() = 0, i.e. ld() defaults (internally) to w()*d()\n"
"+1: ld() = (w() + DX) * d()\n"
"-1 to flip image vertically: ld() = - ((w() + DX) * d())");
rb_LXm1 = new Fl_Radio_Button(cx+15, cy+145, cw-30, 20, "-1");
rb_LXm1->callback(refresh_imgs_CB, (void*)this);
rb_LX0->value(1);
rd_grp->box(FL_BORDER_BOX);
rd_grp->align(FL_ALIGN_INSIDE|FL_ALIGN_BOTTOM|FL_ALIGN_CENTER);
rd_grp->end();
ctr_grp->box(FL_BORDER_BOX);
ctr_grp->end();
end(); // make sure this ImageTest group is closed
} // constructor ends
void draw() FL_OVERRIDE {
Fl_Group::draw();
// top left: RGB
int xx = x()+10, yy = y()+10;
fl_color(FL_BLACK); fl_rect(xx, yy, 130, 130);
if (img) {
i_rgb->draw(xx+1,yy+1);
}
else {
if (!flip_h) {
fl_draw_image(img_rgb, xx+1, yy+1, 128, 128, 3, lx*((128+dx)*3));
}
else {
fl_draw_image(img_rgb, xx+1, yy+1, 128, 128,-3, lx*((128+dx)*3));
}
}
fl_draw("RGB", xx+134, yy+64);
// bottom left: RGBA
xx = x()+10; yy = y()+10+134;
fl_color(FL_BLACK); fl_rect(xx, yy, 130, 130); // black frame
fl_color(FL_WHITE); fl_rectf(xx+1, yy+1, 128, 128); // white background
if (cb) { // checker board
fl_color(FL_BLACK); fl_rectf(xx+65, yy+1, 64, 64);
fl_color(FL_BLACK); fl_rectf(xx+1, yy+65, 64, 64);
}
if (img) {
i_rgba->draw(xx+1,yy+1);
}
else {
if (!flip_h) {
fl_draw_image(img_rgba, xx+1, yy+1, 128, 128, 4, lx*((128+dx)*4));
}
else {
fl_draw_image(img_rgba, xx+1, yy+1, 128, 128,-4, lx*((128+dx)*4));
}
}
fl_color(FL_BLACK); fl_draw("RGBA", xx+134, yy+64);
// top right: Gray
xx = x()+10+200; yy = y()+10;
fl_color(FL_BLACK); fl_rect(xx, yy, 130, 130);
if (img) {
i_g->draw(xx+1,yy+1);
}
else {
if (!flip_h) {
fl_draw_image(img_gray, xx+1, yy+1, 128, 128, 1, lx*((128+dx)*1));
}
else {
fl_draw_image(img_gray, xx+1, yy+1, 128, 128,-1, lx*((128+dx)*1));
}
}
fl_draw("Gray", xx+134, yy+64);
// bottom right: Gray+Alpha
xx = x()+10+200; yy = y()+10+134;
fl_color(FL_BLACK); fl_rect(xx, yy, 130, 130); // black frame
fl_color(FL_WHITE); fl_rectf(xx+1, yy+1, 128, 128); // white background
if (cb) { // checker board
fl_color(FL_BLACK); fl_rectf(xx+65, yy+1, 64, 64);
fl_color(FL_BLACK); fl_rectf(xx+1, yy+65, 64, 64);
}
if (img) {
i_ga->draw(xx+1,yy+1);
}
else {
if (!flip_h) {
fl_draw_image(img_gray_a, xx+1, yy+1, 128, 128, 2, lx*((128+dx)*2));
}
else {
fl_draw_image(img_gray_a, xx+1, yy+1, 128, 128,-2, lx*((128+dx)*2));
}
}
fl_color(FL_BLACK); fl_draw("Gray+Alpha", xx+134, yy+64);
} // draw method end
};
uchar *Ut_Image_Test::img_gray_base = 0;
uchar *Ut_Image_Test::img_gray_a_base = 0;
uchar *Ut_Image_Test::img_rgb_base = 0;
uchar *Ut_Image_Test::img_rgba_base = 0;
uchar *Ut_Image_Test::img_gray = 0;
uchar *Ut_Image_Test::img_gray_a = 0;
uchar *Ut_Image_Test::img_rgb = 0;
uchar *Ut_Image_Test::img_rgba = 0;
Fl_RGB_Image *Ut_Image_Test::i_g = 0;
Fl_RGB_Image *Ut_Image_Test::i_ga = 0;
Fl_RGB_Image *Ut_Image_Test::i_rgb = 0;
Fl_RGB_Image *Ut_Image_Test::i_rgba = 0;
UnitTest images(UT_TEST_IMAGES, "Drawing Images", Ut_Image_Test::create);
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