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293 lines (251 loc) · 7.69 KB
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Copy pathviewport.c
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293 lines (251 loc) · 7.69 KB
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#include "viewport.h"
#include <stdlib.h>
struct imv_viewport {
double scale;
struct {
int width, height;
} window; /* window dimensions */
struct {
int width, height;
} buffer; /* rendering buffer dimensions */
int x, y;
double pan_factor_x, pan_factor_y;
int redraw;
int playing;
int locked;
};
static void input_xy_to_render_xy(struct imv_viewport *view, int *x, int *y)
{
*x *= view->buffer.width / view->window.width;
*y *= view->buffer.height / view->window.height;
}
struct imv_viewport *imv_viewport_create(int window_width, int window_height,
int buffer_width, int buffer_height)
{
struct imv_viewport *view = malloc(sizeof *view);
view->window.width = window_width;
view->window.height = window_height;
view->buffer.width = buffer_width;
view->buffer.height = buffer_height;
view->scale = 1;
view->x = view->y = view->redraw = 0;
view->pan_factor_x = view->pan_factor_y = 0.5;
view->playing = 1;
view->locked = 0;
return view;
}
void imv_viewport_free(struct imv_viewport *view)
{
free(view);
}
void imv_viewport_set_playing(struct imv_viewport *view, bool playing)
{
view->playing = playing;
}
bool imv_viewport_is_playing(struct imv_viewport *view)
{
return view->playing;
}
void imv_viewport_toggle_playing(struct imv_viewport *view)
{
view->playing = !view->playing;
}
void imv_viewport_scale_to_actual(struct imv_viewport *view, const struct imv_image *image)
{
view->scale = 1;
view->redraw = 1;
view->locked = 1;
imv_viewport_center(view, image);
}
void imv_viewport_get_offset(struct imv_viewport *view, int *x, int *y)
{
if(x) {
*x = view->x;
}
if(y) {
*y = view->y;
}
}
void imv_viewport_get_scale(struct imv_viewport *view, double *scale)
{
if(scale) {
*scale = view->scale;
}
}
void imv_viewport_set_default_pan_factor(struct imv_viewport *view, double pan_factor_x, double pan_factor_y)
{
view->pan_factor_x = pan_factor_x;
view->pan_factor_y = pan_factor_y;
}
void imv_viewport_move(struct imv_viewport *view, int x, int y,
const struct imv_image *image)
{
input_xy_to_render_xy(view, &x, &y);
view->x += x;
view->y += y;
view->redraw = 1;
view->locked = 1;
int w = (int)(imv_image_width(image) * view->scale);
int h = (int)(imv_image_height(image) * view->scale);
if (view->x < -w) {
view->x = -w;
}
if (view->x > view->buffer.width) {
view->x = view->buffer.width;
}
if (view->y < -h) {
view->y = -h;
}
if (view->y > view->buffer.height) {
view->y = view->buffer.height;
}
}
void imv_viewport_zoom(struct imv_viewport *view, const struct imv_image *image,
enum imv_zoom_source src, int mouse_x, int mouse_y, int amount)
{
double prev_scale = view->scale;
int x, y;
const int image_width = imv_image_width(image);
const int image_height = imv_image_height(image);
/* x and y cordinates are relative to the image */
if(src == IMV_ZOOM_MOUSE) {
input_xy_to_render_xy(view, &mouse_x, &mouse_y);
x = mouse_x - view->x;
y = mouse_y - view->y;
} else {
x = view->scale * image_width / 2;
y = view->scale * image_height / 2;
}
const int scaled_width = image_width * view->scale;
const int scaled_height = image_height * view->scale;
const int ic_x = view->x + scaled_width/2;
const int ic_y = view->y + scaled_height/2;
const int wc_x = view->buffer.width/2;
const int wc_y = view->buffer.height/2;
double delta_scale = 0.04 * view->buffer.width * amount / image_width;
view->scale += delta_scale;
const double min_scale = 0.1;
const double max_scale = 100;
if(view->scale > max_scale) {
view->scale = max_scale;
} else if (view->scale < min_scale) {
view->scale = min_scale;
}
if(view->scale < prev_scale) {
if(scaled_width < view->buffer.width) {
x = scaled_width/2 - (ic_x - wc_x)*2;
}
if(scaled_height < view->buffer.height) {
y = scaled_height/2 - (ic_y - wc_y)*2;
}
} else {
if(scaled_width < view->buffer.width) {
x = scaled_width/2;
}
if(scaled_height < view->buffer.height) {
y = scaled_height/2;
}
}
const double changeX = x - (x * (view->scale / prev_scale));
const double changeY = y - (y * (view->scale / prev_scale));
view->x += changeX;
view->y += changeY;
view->redraw = 1;
view->locked = 1;
}
void imv_viewport_center(struct imv_viewport *view, const struct imv_image *image)
{
const int image_width = imv_image_width(image);
const int image_height = imv_image_height(image);
view->x = view->buffer.width - image_width * view->scale;
view->y = view->buffer.height - image_height * view->scale;
if (view->x > 0) {
/* Image is smaller than the window. Center the image */
view->x *= 0.5;
} else {
view->x *= view->pan_factor_x;
}
if (view->y > 0) {
/* Image is smaller than the window. Center the image */
view->y *= 0.5;
} else {
view->y *= view->pan_factor_y;
}
view->locked = 1;
view->redraw = 1;
}
void imv_viewport_scale_to_window(struct imv_viewport *view, const struct imv_image *image)
{
const int image_width = imv_image_width(image);
const int image_height = imv_image_height(image);
const double window_aspect = (double)view->buffer.width / (double)view->buffer.height;
const double image_aspect = (double)image_width / (double)image_height;
if(window_aspect > image_aspect) {
/* Image will become too tall before it becomes too wide */
view->scale = (double)view->buffer.height / (double)image_height;
} else {
/* Image will become too wide before it becomes too tall */
view->scale = (double)view->buffer.width / (double)image_width;
}
imv_viewport_center(view, image);
view->locked = 0;
}
void imv_viewport_crop_to_window(struct imv_viewport *view, const struct imv_image *image)
{
const int image_width = imv_image_width(image);
const int image_height = imv_image_height(image);
const double window_aspect = (double)view->buffer.width / (double)view->buffer.height;
const double image_aspect = (double)image_width / (double)image_height;
/* Scale the image so that it fills the whole window */
if(window_aspect > image_aspect) {
view->scale = (double)view->buffer.width / (double)image_width;
} else {
view->scale = (double)view->buffer.height / (double)image_height;
}
imv_viewport_center(view, image);
view->locked = 0;
}
void imv_viewport_set_redraw(struct imv_viewport *view)
{
view->redraw = 1;
}
void imv_viewport_rescale(struct imv_viewport *view, const struct imv_image *image,
enum scaling_mode scaling_mode) {
if (scaling_mode == SCALING_NONE ||
(scaling_mode == SCALING_DOWN
&& view->buffer.width > imv_image_width(image)
&& view->buffer.height > imv_image_height(image))) {
imv_viewport_scale_to_actual(view, image);
} else if (scaling_mode == SCALING_CROP) {
imv_viewport_crop_to_window(view, image);
} else {
imv_viewport_scale_to_window(view, image);
}
}
void imv_viewport_update(struct imv_viewport *view,
int window_width, int window_height,
int buffer_width, int buffer_height,
struct imv_image *image,
enum scaling_mode scaling_mode)
{
view->window.width = window_width;
view->window.height = window_height;
view->buffer.width = buffer_width;
view->buffer.height = buffer_height;
view->redraw = 1;
if(view->locked) {
return;
}
imv_viewport_center(view, image);
imv_viewport_rescale(view, image, scaling_mode);
}
int imv_viewport_needs_redraw(struct imv_viewport *view)
{
int redraw = 0;
if(view->redraw) {
redraw = 1;
view->redraw = 0;
}
return redraw;
}
/* vim:set ts=2 sts=2 sw=2 et: */