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implemented basic seam carving

This commit is contained in:
antifallobst 2023-03-21 00:00:41 +01:00
parent 092e993212
commit 98d5d58558
6 changed files with 370 additions and 40 deletions
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4
CMakeLists.txt
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@ -3,7 +3,7 @@ project(Juniorcamp C)
set(CMAKE_C_STANDARD 99)
add_executable(Juniorcamp main.c)
add_executable(Juniorcamp main.c gfx.c)
target_link_libraries(Juniorcamp imago m)
target_link_libraries(Juniorcamp imago m X11)
target_link_directories(Juniorcamp PRIVATE /usr/local/lib/)

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gfx.c Normal file
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/*
A simple graphics library for CSE 20211 by Douglas Thain
This work is licensed under a Creative Commons Attribution 4.0 International License. https://creativecommons.org/licenses/by/4.0/
For complete documentation, see:
http://www.nd.edu/~dthain/courses/cse20211/fall2013/gfx
Version 3, 11/07/2012 - Now much faster at changing colors rapidly.
Version 2, 9/23/2011 - Fixes a bug that could result in jerky animation.
*/
#include <X11/Xlib.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include "gfx.h"
/*
gfx_open creates several X11 objects, and stores them in globals
for use by the other functions in the library.
*/
static Display *gfx_display=0;
static Window gfx_window;
static GC gfx_gc;
static Colormap gfx_colormap;
static int gfx_fast_color_mode = 0;
/* These values are saved by gfx_wait then retrieved later by gfx_xpos and gfx_ypos. */
static int saved_xpos = 0;
static int saved_ypos = 0;
/* Open a new graphics window. */
void gfx_open( int width, int height, const char *title )
{
gfx_display = XOpenDisplay(0);
if(!gfx_display) {
fprintf(stderr,"gfx_open: unable to open the graphics window.\n");
exit(1);
}
Visual *visual = DefaultVisual(gfx_display,0);
if(visual && visual->class==TrueColor) {
gfx_fast_color_mode = 1;
} else {
gfx_fast_color_mode = 0;
}
int blackColor = BlackPixel(gfx_display, DefaultScreen(gfx_display));
int whiteColor = WhitePixel(gfx_display, DefaultScreen(gfx_display));
gfx_window = XCreateSimpleWindow(gfx_display, DefaultRootWindow(gfx_display), 0, 0, width, height, 0, blackColor, blackColor);
XSetWindowAttributes attr;
attr.backing_store = Always;
XChangeWindowAttributes(gfx_display,gfx_window,CWBackingStore,&attr);
XStoreName(gfx_display,gfx_window,title);
XSelectInput(gfx_display, gfx_window, StructureNotifyMask|KeyPressMask|ButtonPressMask);
XMapWindow(gfx_display,gfx_window);
gfx_gc = XCreateGC(gfx_display, gfx_window, 0, 0);
gfx_colormap = DefaultColormap(gfx_display,0);
XSetForeground(gfx_display, gfx_gc, whiteColor);
// Wait for the MapNotify event
for(;;) {
XEvent e;
XNextEvent(gfx_display, &e);
if (e.type == MapNotify)
break;
}
}
/* Draw a single point at (x,y) */
void gfx_point( int x, int y )
{
XDrawPoint(gfx_display,gfx_window,gfx_gc,x,y);
}
/* Draw a line from (x1,y1) to (x2,y2) */
void gfx_line( int x1, int y1, int x2, int y2 )
{
XDrawLine(gfx_display,gfx_window,gfx_gc,x1,y1,x2,y2);
}
/* Change the current drawing color. */
void gfx_color( int r, int g, int b )
{
XColor color;
if(gfx_fast_color_mode) {
/* If this is a truecolor display, we can just pick the color directly. */
color.pixel = ((b&0xff) | ((g&0xff)<<8) | ((r&0xff)<<16) );
} else {
/* Otherwise, we have to allocate it from the colormap of the display. */
color.pixel = 0;
color.red = r<<8;
color.green = g<<8;
color.blue = b<<8;
XAllocColor(gfx_display,gfx_colormap,&color);
}
XSetForeground(gfx_display, gfx_gc, color.pixel);
}
/* Clear the graphics window to the background color. */
void gfx_clear()
{
XClearWindow(gfx_display,gfx_window);
}
/* Change the current background color. */
void gfx_clear_color( int r, int g, int b )
{
XColor color;
color.pixel = 0;
color.red = r<<8;
color.green = g<<8;
color.blue = b<<8;
XAllocColor(gfx_display,gfx_colormap,&color);
XSetWindowAttributes attr;
attr.background_pixel = color.pixel;
XChangeWindowAttributes(gfx_display,gfx_window,CWBackPixel,&attr);
}
int gfx_event_waiting()
{
XEvent event;
gfx_flush();
while (1) {
if(XCheckMaskEvent(gfx_display,-1,&event)) {
if(event.type==KeyPress) {
XPutBackEvent(gfx_display,&event);
return 1;
} else if (event.type==ButtonPress) {
XPutBackEvent(gfx_display,&event);
return 1;
} else {
return 0;
}
} else {
return 0;
}
}
}
/* Wait for the user to press a key or mouse button. */
char gfx_wait()
{
XEvent event;
gfx_flush();
while(1) {
XNextEvent(gfx_display,&event);
if(event.type==KeyPress) {
saved_xpos = event.xkey.x;
saved_ypos = event.xkey.y;
return XLookupKeysym(&event.xkey,0);
} else if(event.type==ButtonPress) {
saved_xpos = event.xkey.x;
saved_ypos = event.xkey.y;
return event.xbutton.button;
}
}
}
/* Return the X and Y coordinates of the last event. */
int gfx_xpos()
{
return saved_xpos;
}
int gfx_ypos()
{
return saved_ypos;
}
/* Flush all previous output to the window. */
void gfx_flush()
{
XFlush(gfx_display);
}

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gfx.h Normal file
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@ -0,0 +1,51 @@
/*
A simple graphics library for CSE 20211 by Douglas Thain
This work is licensed under a Creative Commons Attribution 4.0 International License. https://creativecommons.org/licenses/by/4.0/
For course assignments, you should not change this file.
For complete documentation, see:
http://www.nd.edu/~dthain/courses/cse20211/fall2013/gfx
Version 3, 11/07/2012 - Now much faster at changing colors rapidly.
Version 2, 9/23/2011 - Fixes a bug that could result in jerky animation.
*/
#ifndef GFX_H
#define GFX_H
/* Open a new graphics window. */
void gfx_open( int width, int height, const char *title );
/* Draw a point at (x,y) */
void gfx_point( int x, int y );
/* Draw a line from (x1,y1) to (x2,y2) */
void gfx_line( int x1, int y1, int x2, int y2 );
/* Change the current drawing color. */
void gfx_color( int red, int green, int blue );
/* Clear the graphics window to the background color. */
void gfx_clear();
/* Change the current background color. */
void gfx_clear_color( int red, int green, int blue );
/* Wait for the user to press a key or mouse button. */
char gfx_wait();
/* Return the X and Y coordinates of the last event. */
int gfx_xpos();
int gfx_ypos();
/* Return the X and Y dimensions of the window. */
int gfx_xsize();
int gfx_ysize();
/* Check to see if an event is waiting. */
int gfx_event_waiting();
/* Flush all previous output to the window. */
void gfx_flush();
#endif

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149
main.c
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@ -1,15 +1,19 @@
#include <stdio.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <math.h>
#include <memory.h>
#include <imago2.h>
#include "gfx.h"
#define DEBUG_BUILD 0
typedef struct {
uint32_t width;
uint32_t height;
uint32_t new_width;
uint32_t new_height;
uint32_t* buffer;
uint32_t* dist_buffer;
} image_T;
@ -40,6 +44,8 @@ image_T* image_load(const char* filename) {
image_T* image = malloc(sizeof(image_T));
image->buffer = img_load_pixels(filename, (int*)&image->width, (int*)&image->height, IMG_FMT_RGBA32);
image->dist_buffer = calloc(image->width * image->height, sizeof(uint32_t));
image->new_width = image->width;
image->new_height = image->height;
}
void image_destruct(image_T* image) {
@ -54,15 +60,15 @@ void image_calculate_dist_buffer(image_T* image) {
memset(image->dist_buffer, 0, image->height * image->width * sizeof(uint32_t));
uint32_t* last_row = image->buffer;
uint32_t* pixel_row = &last_row[image->height+1];
uint32_t* pixel_row = &last_row[image->width];
uint32_t* dist_last_row = image->dist_buffer;
uint32_t* dist_pixel_row = &dist_last_row[image->height+1];
uint32_t* dist_pixel_row = &dist_last_row[image->width];
for (int y = 1; y < image->height; y++) {
for (int y = 1; y < image->new_height; y++) {
#if DEBUG_BUILD
printf(" Y\n");
#endif
for (int x = 0; x < image->width; x++) {
for (int x = 0; x < image->new_width; x++) {
uint32_t pixel = pixel_row[x];
#if DEBUG_BUILD
@ -70,7 +76,7 @@ void image_calculate_dist_buffer(image_T* image) {
#endif
int32_t shortest_dist = -1;
for (int i = (x > 0 ? -1 : 0); i < (x < image->width-1 ? 2 : 1); i++) {
for (int i = (x > 0 ? -1 : 0); i < (x < image->new_width-1 ? 2 : 1); i++) {
uint32_t dist = pixel_distance(pixel, last_row[x + i]) + dist_last_row[x + i];
if (shortest_dist == -1 || shortest_dist > dist) {
@ -89,62 +95,129 @@ void image_calculate_dist_buffer(image_T* image) {
}
last_row = pixel_row;
pixel_row = &last_row[image->height+1];
pixel_row = &pixel_row[image->width];
dist_last_row = dist_pixel_row;
dist_pixel_row = &dist_last_row[image->height+1];
dist_pixel_row = &dist_pixel_row[image->width];
}
}
uint32_t image_find_best_line(image_T* image) {
uint32_t* row = &image->dist_buffer[(image->new_height-1) * image->width];
uint32_t line_id = 0;
int32_t shortest_dist = -1;
for (uint32_t x = 0; x < image->new_width; x++) {
if (shortest_dist == -1 || shortest_dist > row[x]) {
shortest_dist = (int32_t)row[x];
line_id = x;
printf("id: %d dist: %d\n", x, row[x]);
}
}
return line_id;
}
void image_cut_line(image_T* image, uint32_t line_id) {
uint32_t x = line_id;
for (uint32_t y = image->height-1; y > 0; y--) {
int32_t shortest_dist = -1;
int8_t offset;
for (int i = (x > 0 ? -1 : 0); i < (x < image->new_width-1 ? 2 : 1); i++) {
uint32_t dist = image->dist_buffer[(image->width * y) + x + i];
if (shortest_dist == -1 || shortest_dist > dist) {
shortest_dist = (int32_t)dist;
offset = i;
}
}
x += offset;
memcpy(&image->buffer[(image->width * y) + x], &image->buffer[(image->width * y) + x + 1], (image->new_width - x) * sizeof(uint32_t));
gfx_color(0, 0xFF, 0);
gfx_point(x, y);
gfx_flush();
}
image->new_width -= 1;
}
void image_dump(image_T* image) {
printf("Pixels:\n");
for (int y = 0; y < image->height; y++) {
uint32_t* pixel_row = &image->buffer[y * (image->height+1)];
#if DEBUG_BUILD
printf("Pixels:\n");
#endif
for (int y = 0; y < image->new_height; y++) {
uint32_t* pixel_row = &image->buffer[y * image->width];
printf(" ");
for (int x = 0; x < image->width; x++) {
printf("%x ", pixel_row[x]);
#if DEBUG_BUILD
printf(" ");
#endif
for (int x = 0; x < image->new_width; x++) {
#if DEBUG_BUILD
printf("%x ", pixel_row[x]);
#endif
gfx_color((uint8_t)(pixel_row[x] & 0xFF),
(uint8_t)((pixel_row[x] >> 8) & 0xFF),
(uint8_t)((pixel_row[x] >> 16) & 0xFF));
gfx_point(x, y);
}
printf("\n");
#if DEBUG_BUILD
printf("\n");
#endif
}
printf("Distances:\n");
for (int y = 0; y < image->height; y++) {
uint32_t* dist_row = &image->dist_buffer[y * (image->height+1)];
gfx_color(0, 0, 0);
for (int y = 0; y < image->new_height; y++) {
gfx_point(image->new_width, y);
}
printf(" ");
gfx_flush();
#if DEBUG_BUILD
printf("Distances:\n");
#endif
for (int y = 0; y < image->height; y++) {
uint32_t* dist_row = &image->dist_buffer[y * image->width];
#if DEBUG_BUILD
printf(" ");
#endif
for (int x = 0; x < image->width; x++) {
printf("%x ", dist_row[x]);
#if DEBUG_BUILD
printf("%x ", dist_row[x]);
#endif
}
printf("\n");
#if DEBUG_BUILD
printf("\n");
#endif
}
}
uint32_t test_array[12] = {
0x00000001, 0x00000003, 0x00000005, 0x00000001,
0x00000001, 0x00000007, 0x00000001, 0x00000002,
0x0000000A, 0x00000003, 0x00000002, 0x00000005
};
int main() {
printf("Line Cutter - Juniorcamp Informatik\n");
// image_T* image = image_load("../paris.png");
image_T* image = image_load("../paris.png");
image_T* image = malloc(sizeof(image_T));
image->height = 3;
image->width = 4;
image->buffer = test_array;
image->dist_buffer = calloc(image->width * image->height, sizeof(uint32_t));
gfx_open(800, 600, "Juniorcamp Informatik - Line Cutter");
image_calculate_dist_buffer(image);
image_dump(image);
bool running = true;
while(running) {
image_dump(image);
char c = gfx_wait();
switch (c) {
case 's': {
image_calculate_dist_buffer(image);
image_cut_line(image, image_find_best_line(image));
break;
}
case 'q': {
running = false;
break;
}
}
}
// image_destruct(image);
free(image->dist_buffer);
free(image);
image_destruct(image);
return 0;
}