71 lines
1.8 KiB
C++
71 lines
1.8 KiB
C++
#include <mbgl/platform/default/headless_view.hpp>
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#include <mbgl/gl/gl.hpp>
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#include <cstring>
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namespace mbgl {
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HeadlessView::HeadlessView(float pixelRatio_, uint16_t width, uint16_t height)
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: pixelRatio(pixelRatio_), dimensions({ { width, height } }), needsResize(true) {
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}
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HeadlessView::~HeadlessView() {
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clearBuffers();
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}
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void HeadlessView::bind() {
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if (needsResize) {
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clearBuffers();
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resizeFramebuffer();
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needsResize = false;
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} else {
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bindFramebuffer();
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}
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}
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void HeadlessView::resize(const uint16_t width, const uint16_t height) {
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if(dimensions[0] == width &&
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dimensions[1] == height) {
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return;
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}
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dimensions = {{ width, height }};
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needsResize = true;
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}
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PremultipliedImage HeadlessView::readStillImage(std::array<uint16_t, 2> size) {
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if (!size[0] || !size[1]) {
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size[0] = dimensions[0] * pixelRatio;
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size[1] = dimensions[1] * pixelRatio;
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}
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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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float HeadlessView::getPixelRatio() const {
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return pixelRatio;
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}
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std::array<uint16_t, 2> HeadlessView::getSize() const {
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return dimensions;
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}
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std::array<uint16_t, 2> HeadlessView::getFramebufferSize() const {
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return {{ static_cast<uint16_t>(dimensions[0] * pixelRatio),
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static_cast<uint16_t>(dimensions[1] * pixelRatio) }};
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}
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} // namespace mbgl
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