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#include "video/video.h"
#include "filesystem/path.h"
#include "Nebu_filesystem.h"
#include <png.h>
#include <stdio.h>
#include <stdlib.h>
#ifndef PATH_MAX
#define PATH_MAX 255
#endif
#define SCREENSHOT_PREFIX "gltron"
#define SCREENSHOT_PNG_BITDEPTH 8
#define SCREENSHOT_BYTES_PER_PIXEL 3
typedef struct {
int width;
int height;
unsigned char *pixmap;
} screenshot_info_t;
static FILE *fp;
static void user_write_data(png_structp png_ptr,
png_bytep data, png_size_t length) {
fwrite(data, length, 1, fp);
}
static void user_flush_data(png_structp png_ptr) {
fflush(fp);
}
static int writePixmapToPng(screenshot_info_t *screenshot, char *fname) {
png_structp png_ptr;
png_infop info_ptr;
png_byte **row_ptrs;
int i;
if (!(fp = fopen(fname, "wb"))) {
fprintf(stderr, "can't open %s for writing\n", fname);
return -1;
}
if (!(png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
NULL, NULL, NULL))) {
return -1;
}
if (!(info_ptr = png_create_info_struct(png_ptr))) {
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
return -1;
}
png_set_write_fn(png_ptr, 0, user_write_data, user_flush_data);
/* png_init_io(png_ptr, fp); */
png_set_IHDR(png_ptr, info_ptr, screenshot->width, screenshot->height,
SCREENSHOT_PNG_BITDEPTH, PNG_COLOR_TYPE_RGB,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
png_write_info(png_ptr, info_ptr);
/* get pointers */
if(!(row_ptrs = (png_byte**) malloc(screenshot->height * sizeof(png_byte*)))) {
png_destroy_write_struct(&png_ptr, &info_ptr);
return -1;
}
for(i = 0; i < screenshot->height; i++) {
row_ptrs[i] = screenshot->pixmap + (screenshot->height - i - 1)
* SCREENSHOT_BYTES_PER_PIXEL * screenshot->width;
}
png_write_image(png_ptr, row_ptrs);
png_write_end(png_ptr, info_ptr);
png_destroy_write_struct(&png_ptr, &info_ptr);
free(row_ptrs);
return 0;
}
/*
getNextFilename - find the next free filename in series.
*/
static char* getNextFilename(const char *suffix, int *start_at) {
char *path = NULL;
char fname[PATH_MAX];
do {
if(path != NULL)
free(path);
(*start_at)++;
sprintf(fname, "%s-%s-%d%s", SCREENSHOT_PREFIX, VERSION, *start_at,
suffix);
path = getPossiblePath( PATH_SNAPSHOTS, fname );
} while ( fileExists(path));
return path;
}
static int captureScreenToPixmap(screenshot_info_t *img, Visual *display) {
img->width = display->w;
img->height = display->h;
if (!(img->pixmap = malloc(img->width *
img->height * SCREENSHOT_BYTES_PER_PIXEL))) {
return -1;
}
glReadPixels(0, 0, img->width, img->height, GL_RGB, GL_UNSIGNED_BYTE,
img->pixmap);
return 0;
}
void doPngScreenShot(Visual *display) {
screenshot_info_t screenshot;
static int last_png_num; /* store last free file index. */
char *path;
path = getNextFilename(".png", &last_png_num);
if(path != NULL) {
if (captureScreenToPixmap(&screenshot, display) != 0) {
fprintf(stderr, "Error capturing screenshot\n");
return;
}
if (writePixmapToPng(&screenshot, path) != 0) {
fprintf(stderr, "Error writing screenshot %s\n", path);
} else {
fprintf(stderr, "Screenshot written to %s\n", path);
}
free(screenshot.pixmap);
free(path);
}
}
void doBmpScreenShot(Visual *display) {
screenshot_info_t screenshot;
static int last_bmp_num; /* store last free file index. */
char *path;
path = getNextFilename(".bmp", &last_bmp_num);
if(path != NULL) {
if (captureScreenToPixmap(&screenshot, display) != 0) {
fprintf(stderr, "Error capturing screenshot\n");
return;
}
if (SystemWriteBMP(path, screenshot.width, screenshot.height,
screenshot.pixmap) != 0) {
fprintf(stderr, "Error writing screenshot %s\n", path);
} else {
fprintf(stderr, "Screenshot written to %s\n", path);
}
free(screenshot.pixmap);
free(path);
}
}
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