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common.h
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common.h
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#ifndef _COMMON_H_
#define _COMMON_H_
#include <pybind11/pybind11.h>
#include <skia.h>
#include <sstream>
namespace pybind11 { class array; } // namespace pybind11
namespace py = pybind11;
#define CHECK_NOTNULL(ptr) \
if (!ptr) throw std::runtime_error("Null pointer exception.")
PYBIND11_DECLARE_HOLDER_TYPE(T, sk_sp<T>);
template <typename T>
sk_sp<T> CloneFlattenable(const T& flattenable) {
auto data = flattenable.serialize();
return T::Deserialize(data->data(), data->size());
}
template <> sk_sp<SkShader> CloneFlattenable(const SkShader& shader);
template <>
sk_sp<SkColorFilter> CloneFlattenable(const SkColorFilter& colorFilter);
sk_sp<SkColorSpace> CloneColorSpace(const SkColorSpace* cs);
sk_sp<SkImage> CloneImage(const SkImage& image);
size_t ValidateBufferToImageInfo(
const SkImageInfo& imageInfo, const py::buffer_info& buffer,
size_t rowBytes = 0);
template <typename T>
bool ReadPixels(T& readable, const SkImageInfo& imageInfo, py::buffer dstPixels,
size_t dstRowBytes, int srcX, int srcY) {
auto info = dstPixels.request(true);
auto rowBytes = ValidateBufferToImageInfo(imageInfo, info, dstRowBytes);
return readable.readPixels(imageInfo, info.ptr, rowBytes, srcX, srcY);
}
template <typename T, typename R = py::array>
R ReadToNumpy(T& readable, int srcX, int srcY, SkColorType colorType,
SkAlphaType alphaType, const SkColorSpace* colorSpace) {
if (colorType == kUnknown_SkColorType)
colorType = readable.imageInfo().colorType();
auto imageInfo = SkImageInfo::Make(
readable.imageInfo().dimensions(), colorType, alphaType,
CloneColorSpace(colorSpace));
R array(ImageInfoToBufferInfo(imageInfo, nullptr));
if (!readable.readPixels(
imageInfo, array.mutable_data(), array.strides(0), srcX, srcY))
throw std::runtime_error("Failed to convert to numpy array.");
return array;
}
SkImageInfo NumPyToImageInfo(
py::array array, SkColorType ct, SkAlphaType at, const SkColorSpace* cs);
py::buffer_info ImageInfoToBufferInfo(
const SkImageInfo& imageInfo, void* data, py::ssize_t rowBytes = 0,
bool readonly = true);
py::memoryview ImageInfoToMemoryView(
const SkImageInfo& imageInfo, void* data, py::ssize_t rowBytes = 0,
bool readonly = true);
py::dict ImageInfoToArrayInterface(
const SkImageInfo& imageInfo, size_t rowBytes = 0);
#endif // _COMMON_H_