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#include <stdio.h>
#include "agg_trans_affine.h"
#include "agg_conv_stroke.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_rendering_buffer.h"
#include "agg_scanline_u.h"
#include "agg_renderer_scanline.h"
#include "agg_gamma_lut.h"
#include "ctrl/agg_slider_ctrl.h"
#include "ctrl/agg_rbox_ctrl.h"
#include "platform/agg_platform_support.h"
#include "agg_pixfmt_rgb.h"
#define pix_format agg::pix_format_bgr24
typedef agg::pixfmt_bgr24 pixfmt;
typedef agg::pixfmt_bgr24_pre pixfmt_pre;
#define pixfmt_gamma agg::pixfmt_bgr24_gamma
typedef agg::rgba8 color_type;
typedef agg::order_bgr component_order;
enum flip_y_e { flip_y = true };
class the_application : public agg::platform_support
{
agg::slider_ctrl<agg::rgba8> m_gamma;
agg::slider_ctrl<agg::rgba8> m_r;
agg::slider_ctrl<agg::rgba8> m_g;
agg::slider_ctrl<agg::rgba8> m_b;
agg::rbox_ctrl <agg::rgba8> m_pattern;
public:
the_application(agg::pix_format_e format, bool flip_y) :
agg::platform_support(format, flip_y),
m_gamma (5, 5, 350-5, 11, !flip_y),
m_r (5, 5+15, 350-5, 11+15, !flip_y),
m_g (5, 5+30, 350-5, 11+30, !flip_y),
m_b (5, 5+45, 350-5, 11+45, !flip_y),
m_pattern (355, 1, 495, 60, !flip_y)
{
m_pattern.text_size(8);
m_pattern.add_item("Horizontal");
m_pattern.add_item("Vertical");
m_pattern.add_item("Checkered");
m_pattern.cur_item(2);
add_ctrl(m_gamma);
add_ctrl(m_r);
add_ctrl(m_g);
add_ctrl(m_b);
add_ctrl(m_pattern);
m_gamma.range(0.5, 4.0);
m_gamma.value(2.2);
m_gamma.label("Gamma=%.2f");
m_r.value(1.0);
m_g.value(1.0);
m_b.value(1.0);
m_r.label("R=%.2f");
m_g.label("G=%.2f");
m_b.label("B=%.2f");
}
virtual void on_init()
{
}
virtual void on_draw()
{
typedef agg::gamma_lut<color_type::value_type, color_type::value_type,
color_type::base_shift, color_type::base_shift> gamma_type;
typedef pixfmt_gamma<gamma_type> pixfmt_type;
typedef agg::renderer_base<pixfmt_type> ren_base;
double g = m_gamma.value();
gamma_type gamma(g);
pixfmt_type pixf(rbuf_window(), gamma);
ren_base renb(pixf);
agg::rasterizer_scanline_aa<> ras;
agg::scanline_u8 sl;
enum
{
square_size = 400,
ver_strips = 5
};
color_type span1[square_size];
color_type span2[square_size];
color_type color(agg::rgba(m_r.value(), m_g.value(), m_b.value()));
unsigned i, j;
// Draw vertical gradient
//-----------------------
unsigned w = (unsigned)width();
unsigned h = (unsigned)height();
for(i = 0; i < h; i++)
{
double k = (i - 80) / double(square_size - 1);
if(i < 80) k = 0.0;
if(i >= 80+square_size) k = 1.0;
k = 1 - pow(k/2, 1/m_gamma.value());
color_type c = color.gradient(color_type(0,0,0), k);
renb.copy_hline(0, i, w-1, c);
}
// Calculate spans
//-----------------------
switch(m_pattern.cur_item())
{
case 0:
for(i = 0; i < square_size; i++)
{
span1[i] = span2[i] = color;
span1[i].a = i * color_type::base_mask / square_size;
span2[i].a = color_type::base_mask - span1[i].a;
}
break;
case 1:
for(i = 0; i < square_size; i++)
{
span1[i] = span2[i] = color;
if(i & 1)
{
span1[i].a = i * color_type::base_mask / square_size;
span2[i].a = span1[i].a;
}
else
{
span1[i].a = color_type::base_mask -
i * color_type::base_mask / square_size;
span2[i].a = span1[i].a;
}
}
break;
case 2:
for(i = 0; i < square_size; i++)
{
span1[i] = span2[i] = color;
if(i & 1)
{
span1[i].a = i * color_type::base_mask / square_size;
span2[i].a = color_type::base_mask - span1[i].a;
}
else
{
span2[i].a = i * color_type::base_mask / square_size;
span1[i].a = color_type::base_mask - span2[i].a;
}
}
break;
}
// Clear the area
//---------------------
renb.copy_bar(50, 80, 50+square_size-1, 80+square_size-1, agg::rgba(0,0,0));
// Draw the patern
//---------------------
for(i = 0; i < square_size; i += 2)
{
double k = i / double(square_size - 1);
k = 1 - pow(k, 1/m_gamma.value());
color_type c = color.gradient(agg::rgba(0,0,0), k);
for(j = 0; j < square_size; j++)
{
span1[j].r = span2[j].r = c.r;
span1[j].g = span2[j].g = c.g;
span1[j].b = span2[j].b = c.b;
}
renb.blend_color_hspan(50, i + 80 + 0, square_size, span1, 0, 255);
renb.blend_color_hspan(50, i + 80 + 1, square_size, span2, 0, 255);
}
// Draw vertical strips
//---------------------
for(i = 0; i < square_size; i++)
{
double k = i / double(square_size - 1);
k = 1 - pow(k/2, 1/m_gamma.value());
color_type c = color.gradient(color_type(0,0,0), k);
for(j = 0; j < ver_strips; j++)
{
int xc = square_size * (j + 1) / (ver_strips + 1);
renb.copy_hline(50+xc-10, i+80, 50+xc+10, c);
}
}
agg::render_ctrl(ras, sl, renb, m_gamma);
agg::render_ctrl(ras, sl, renb, m_r);
agg::render_ctrl(ras, sl, renb, m_g);
agg::render_ctrl(ras, sl, renb, m_b);
agg::render_ctrl(ras, sl, renb, m_pattern);
}
virtual void on_mouse_button_down(int x, int y, unsigned flags)
{
}
virtual void on_mouse_move(int x, int y, unsigned flags)
{
}
};
int agg_main(int argc, char* argv[])
{
the_application app(pix_format, flip_y);
app.caption("AGG Example. Gamma Tuner");
if(app.init(500, 500, 0))
{
return app.run();
}
return 1;
}
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