eBookReaderSwitch/source/menus/book/PageLayout.cpp

128 lines
3.0 KiB
C++

#include "PageLayout.hpp"
#include "common.h"
#include <algorithm>
PageLayout::PageLayout(fz_document *doc, int current_page):doc(doc),pdf(pdf_specifics(ctx, doc)),pages_count(fz_count_pages(ctx, doc))
{
_current_page = std::min(std::max(0, current_page), pages_count - 1);
SDL_RenderGetViewport(RENDERER, &viewport);
render_page_to_texture(_current_page, false);
}
void PageLayout::previous_page(int n)
{
render_page_to_texture(_current_page - n, false);
}
void PageLayout::next_page(int n)
{
render_page_to_texture(_current_page + n, false);
}
void PageLayout::zoom_in()
{
set_zoom(zoom + 0.1);
};
void PageLayout::zoom_out()
{
set_zoom(zoom - 0.1);
};
void PageLayout::move_up()
{
move_page(0, 50);
};
void PageLayout::move_down()
{
move_page(0, -50);
};
void PageLayout::move_left()
{
move_page(-50, 0);
};
void PageLayout::move_right()
{
move_page(50, 0);
};
void PageLayout::reset()
{
page_center = fz_make_point(viewport.w / 2, viewport.h / 2);
set_zoom(min_zoom);
};
void PageLayout::draw_page()
{
float w = page_bounds.x1 * zoom, h = page_bounds.y1 * zoom;
SDL_Rect rect;
rect.x = page_center.x - w / 2;
rect.y = page_center.y - h / 2;
rect.w = w;
rect.h = h;
SDL_RenderCopy(RENDERER, page_texture, NULL, &rect);
}
char* PageLayout::info()
{
static char title[128];
sprintf(title, "%i/%i, %.2f%%", _current_page + 1, pages_count, zoom * 100);
return title;
}
void PageLayout::render_page_to_texture(int num, bool reset_zoom)
{
FreeTextureIfNeeded(&page_texture);
_current_page = std::min(std::max(0, num), pages_count - 1);
fz_page *page = fz_load_page(ctx, doc, _current_page);
fz_rect bounds = fz_bound_page(ctx, page);
if (page_bounds.x1 != bounds.x1 || page_bounds.y1 != bounds.y1 || reset_zoom)
{
page_bounds = bounds;
page_center = fz_make_point(viewport.w / 2, viewport.h / 2);
min_zoom = fmin(viewport.w / bounds.x1, viewport.h / bounds.y1);
max_zoom = fmax(viewport.w / bounds.x1, viewport.h / bounds.y1);
zoom = min_zoom;
}
fz_pixmap *pix = fz_new_pixmap_from_page_contents(ctx, page, fz_scale(zoom, zoom), fz_device_rgb(ctx), 0);
SDL_Surface *image = SDL_CreateRGBSurfaceFrom(pix->samples, pix->w, pix->h, pix->n * 8, pix->w * pix->n, 0x000000FF, 0x0000FF00, 0x00FF0000, 0);
page_texture = SDL_CreateTextureFromSurface(RENDERER, image);
SDL_FreeSurface(image);
fz_drop_pixmap(ctx, pix);
fz_drop_page(ctx, page);
}
void PageLayout::set_zoom(float value)
{
value = fmin(fmax(min_zoom, value), max_zoom);
if (value == zoom)
return;
zoom = value;
render_page_to_texture(_current_page, false);
move_page(0, 0);
}
void PageLayout::move_page(float x, float y)
{
float w = page_bounds.x1 * zoom, h = page_bounds.y1 * zoom;
page_center.x = fmin(fmax(page_center.x + x, w / 2), viewport.w - w / 2);
page_center.y = fmin(fmax(page_center.y + y, viewport.h - h / 2), h / 2);
}