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#include <mbgl/platform/default/offscreen_view.hpp>
#include <mbgl/gl/context.hpp>
#include <mbgl/gl/gl.hpp>
#include <cstring>
#include <cassert>
namespace mbgl {
OffscreenView::OffscreenView(gl::Context& context_, const Size size_)
: size(std::move(size_)), context(context_) {
assert(size);
}
void OffscreenView::bind() {
if (!framebuffer) {
color = context.createRenderbuffer<gl::RenderbufferType::RGBA>(size);
depthStencil = context.createRenderbuffer<gl::RenderbufferType::DepthStencil>(size);
framebuffer = context.createFramebuffer(*color, *depthStencil);
} else {
context.bindFramebuffer = framebuffer->framebuffer;
}
context.viewport = { 0, 0, size };
}
PremultipliedImage OffscreenView::readStillImage() {
PremultipliedImage image { size };
MBGL_CHECK_ERROR(glReadPixels(0, 0, size.width, size.height, GL_RGBA, GL_UNSIGNED_BYTE, image.data.get()));
const auto stride = image.stride();
auto tmp = std::make_unique<uint8_t[]>(stride);
uint8_t* rgba = image.data.get();
for (int i = 0, j = size.height - 1; i < j; i++, j--) {
std::memcpy(tmp.get(), rgba + i * stride, stride);
std::memcpy(rgba + i * stride, rgba + j * stride, stride);
std::memcpy(rgba + j * stride, tmp.get(), stride);
}
return image;
}
} // namespace mbgl
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