Image::Image(image_ptr this_) :
ObjectWrap(),
this_(this_),
estimated_size_(this_->width() * this_->height() * 4)
{
V8::AdjustAmountOfExternalAllocatedMemory(estimated_size_);
}
//! @brief テクスチャバッファを生成し、
//! バッファへ画像をバインドする
void bind_image(image_ptr img){
uint_t id;
glGenTextures(1, &id);
glBindTexture(GL_TEXTURE_2D, id);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, img->internal_format(), img->width(), img->height(), 0,
img->pixel_format(), GL_UNSIGNED_BYTE, img->data_front());
glBindTexture(GL_TEXTURE_2D, 0);
info.reset(new texture_info(id, img));
}
void image_base::resize(image_ptr target) {
if (target->get_width() > get_width()) {
// scale up
unsigned int factor = target->get_width() / get_width();
boost::shared_array<color> line(new color[get_width()]);
unsigned int scanline = 0;
bool first = false;
for (pos_t y = 0; y < target->get_height(); y++) {
pos_t y_p = (y / factor);
if (y_p != scanline || !first) {
get_line(y_p, pos_t(0), get_width(), line.get());
first = true;
scanline = y_p;
}
for (pos_t x = 0; x < target->get_width(); x++) {
pos_t x_p = (x / factor);
target->set_pixel(x, y, line[x_p]);
}
}
}
else {
// scale down
unsigned int factor = get_width() / target->get_width();
boost::shared_array<color> line(new color[get_width()]);
for (pos_t y = 0; y < target->get_height(); y++) {
pos_t y_p = ((y * factor) + factor / 2);
get_line(y_p, pos_t(0), get_width(), line.get());
for (pos_t x = 0; x < target->get_width(); x++) {
pos_t x_p = ((x * factor) + factor / 2);
target->set_pixel(x, y, line[x_p]);
}
}
}
}