48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
#include <mbgl/platform/default/offscreen_view.hpp>
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#include <mbgl/gl/context.hpp>
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#include <mbgl/gl/gl.hpp>
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#include <cstring>
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#include <cassert>
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namespace mbgl {
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OffscreenView::OffscreenView(gl::Context& context_, std::array<uint16_t, 2> size_)
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: context(context_), size(std::move(size_)) {
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assert(size[0] > 0 && size[1] > 0);
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}
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void OffscreenView::bind() {
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if (!framebuffer) {
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color = context.createRenderbuffer<gl::RenderbufferType::RGBA>(size);
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depthStencil = context.createRenderbuffer<gl::RenderbufferType::DepthStencil>(size);
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framebuffer = context.createFramebuffer(*color, *depthStencil);
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} else {
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context.bindFramebuffer = framebuffer->framebuffer;
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}
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context.viewport = { 0, 0, size[0], size[1] };
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}
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PremultipliedImage OffscreenView::readStillImage() {
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PremultipliedImage image { size[0], size[1] };
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MBGL_CHECK_ERROR(glReadPixels(0, 0, size[0], size[1], GL_RGBA, GL_UNSIGNED_BYTE, image.data.get()));
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const auto stride = image.stride();
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auto tmp = std::make_unique<uint8_t[]>(stride);
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uint8_t* rgba = image.data.get();
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for (int i = 0, j = size[1] - 1; i < j; i++, j--) {
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std::memcpy(tmp.get(), rgba + i * stride, stride);
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std::memcpy(rgba + i * stride, rgba + j * stride, stride);
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std::memcpy(rgba + j * stride, tmp.get(), stride);
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}
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return image;
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}
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std::array<uint16_t, 2> OffscreenView::getSize() const {
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return size;
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}
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} // namespace mbgl
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