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Speed up blurhash code

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This commit is contained in:
Nicolas Werner 2020-03-04 01:30:43 +01:00
parent 0fc98b2692
commit 5ac18f1f5f
4 changed files with 10 additions and 18 deletions
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19
src/BlurhashProvider.cpp
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@ -17,26 +17,13 @@ BlurhashProvider::requestImage(const QString &id, QSize *size, const QSize &requ
*size = sz;
auto decoded = blurhash::decode(
QUrl::fromPercentEncoding(id.toUtf8()).toStdString(), sz.width(), sz.height());
QUrl::fromPercentEncoding(id.toUtf8()).toStdString(), sz.width(), sz.height(), 4);
if (decoded.image.empty()) {
*size = QSize();
return QImage();
}
QImage image(sz, QImage::Format_RGB888);
QImage image(decoded.image.data(), decoded.width, decoded.height, QImage::Format_RGB32);
for (int y = 0; y < sz.height(); y++) {
for (int x = 0; x < sz.width(); x++) {
int base = (y * sz.width() + x) * 3;
image.setPixel(x,
y,
qRgb(decoded.image[base],
decoded.image[base + 1],
decoded.image[base + 2]));
}
}
// std::copy(decoded.image.begin(), decoded.image.end(), image.bits());
return image;
return image.copy();
}

2
src/ChatPage.cpp
View file

@ -332,6 +332,8 @@ ChatPage::ChatPage(QSharedPointer<UserSettings> userSettings, QWidget *parent)
QImage img;
img.loadFromData(bin);
if (img.height() > 200 && img.width() > 360)
img = img.scaled(360, 200, Qt::KeepAspectRatioByExpanding);
std::vector<unsigned char> data;
for (int y = 0; y < img.height(); y++) {
for (int x = 0; x < img.width(); x++) {

5
third_party/blurhash/blurhash.cpp vendored
View file

@ -251,7 +251,7 @@ multiplyBasisFunction(Components components, int width, int height, unsigned cha
namespace blurhash {
Image
decode(std::string_view blurhash, size_t width, size_t height)
decode(std::string_view blurhash, size_t width, size_t height, size_t bytesPerPixel)
{
Image i{};
@ -295,6 +295,9 @@ decode(std::string_view blurhash, size_t width, size_t height)
i.image.push_back(static_cast<unsigned char>(linearToSrgb(c.r)));
i.image.push_back(static_cast<unsigned char>(linearToSrgb(c.g)));
i.image.push_back(static_cast<unsigned char>(linearToSrgb(c.b)));
for (size_t p = 3; p < bytesPerPixel; p++)
i.image.push_back(255);
}
}

2
third_party/blurhash/blurhash.hpp vendored
View file

@ -13,7 +13,7 @@ struct Image
// Decode a blurhash to an image with size width*height
Image
decode(std::string_view blurhash, size_t width, size_t height);
decode(std::string_view blurhash, size_t width, size_t height, size_t bytesPerPixel = 3);
// Encode an image of rgb pixels (without padding) with size width*height into a blurhash with x*y
// components