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// 必须在任何 Qt 头（会定义宏 signals）之前包含 vips/glib
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#ifdef LT_HAVE_VIPS
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# include <vips/vips.h>
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#endif
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#include "large_image/VipsBackend.h"
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#include <QByteArray>
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#include <QFile>
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#include <QFileInfo>
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#include <algorithm>
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#include <cmath>
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#include <cstdlib>
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namespace core {
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#ifdef LT_HAVE_VIPS
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namespace {
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bool gReady = false;
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QByteArray encodedPath(const QString& path) {
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return QFile::encodeName(path);
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}
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bool saveVipsImageToPngFile(VipsImage* img, const QString& destPath) {
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if (!img) {
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return false;
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}
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const QByteArray dest = encodedPath(destPath);
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if (vips_pngsave(img, dest.constData(), "compression", 3, nullptr) != 0) {
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return false;
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}
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return true;
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}
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} // namespace
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bool VipsBackend::init(const char* argv0) {
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if (gReady) {
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return true;
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}
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if (vips_init(argv0) != 0) {
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return false;
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}
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gReady = true;
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return true;
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}
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void VipsBackend::shutdown() {
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if (!gReady) {
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return;
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}
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vips_shutdown();
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gReady = false;
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}
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bool VipsBackend::isAvailable() {
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return gReady;
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}
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bool VipsBackend::probeSize(const QString& path, QSize* out) {
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if (!gReady || !out) {
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return false;
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}
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const QByteArray enc = encodedPath(path);
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if (enc.isEmpty()) {
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return false;
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}
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VipsImage* in = vips_image_new_from_file(enc.constData(), "access", VIPS_ACCESS_SEQUENTIAL, nullptr);
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if (!in) {
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return false;
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}
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const int w = vips_image_get_width(in);
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const int h = vips_image_get_height(in);
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g_object_unref(in);
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if (w <= 0 || h <= 0) {
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return false;
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}
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*out = QSize(w, h);
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return true;
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}
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bool VipsBackend::loadThumbnailQImage(const QString& path, qint64 maxPixels, QImage* out) {
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if (!gReady || !out || maxPixels < 1024) {
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return false;
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}
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const QByteArray enc = encodedPath(path);
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if (enc.isEmpty()) {
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return false;
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}
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QSize sz;
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if (!probeSize(path, &sz)) {
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return false;
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}
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const qint64 pixels = qint64(sz.width()) * qint64(sz.height());
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if (pixels <= 0) {
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return false;
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}
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VipsImage* thumb = nullptr;
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if (pixels <= maxPixels) {
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thumb = vips_image_new_from_file(enc.constData(), "access", VIPS_ACCESS_SEQUENTIAL, nullptr);
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if (!thumb) {
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return false;
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}
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} else {
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const int targetW =
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std::max(1, int(std::floor(std::sqrt(double(maxPixels) * double(sz.width()) / double(sz.height())))));
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if (vips_thumbnail(enc.constData(), &thumb, targetW, nullptr) != 0) {
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return false;
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}
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}
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void* buf = nullptr;
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size_t len = 0;
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if (vips_pngsave_buffer(thumb, &buf, &len, "compression", 3, nullptr) != 0) {
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g_object_unref(thumb);
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return false;
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}
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g_object_unref(thumb);
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const bool ok = out->loadFromData(static_cast<const uchar*>(buf), static_cast<int>(len), "PNG");
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g_free(buf);
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return ok && !out->isNull();
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}
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bool VipsBackend::loadRegionToQImage(const QString& sourcePath, const QRect& rectInSource, int maxOutputWidth,
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int maxOutputHeight, QImage* out) {
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if (!gReady || !out || maxOutputWidth < 32 || maxOutputHeight < 32) {
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return false;
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}
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out->detach();
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*out = QImage();
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const QByteArray src = encodedPath(sourcePath);
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if (src.isEmpty()) {
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return false;
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}
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VipsImage* in = vips_image_new_from_file(src.constData(), "access", VIPS_ACCESS_RANDOM, nullptr);
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if (!in) {
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return false;
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}
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const int iw = vips_image_get_width(in);
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const int ih = vips_image_get_height(in);
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const QRect bounds(0, 0, iw, ih);
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QRect r = rectInSource.normalized().intersected(bounds);
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if (r.width() <= 0 || r.height() <= 0) {
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g_object_unref(in);
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return false;
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}
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VipsImage* cropped = nullptr;
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if (vips_crop(in, &cropped, r.left(), r.top(), r.width(), r.height(), nullptr) != 0) {
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g_object_unref(in);
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return false;
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}
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g_object_unref(in);
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const int cw = r.width();
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const int ch = r.height();
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VipsImage* toEncode = cropped;
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// 视口解码：输出尺寸不应超过 maxOutput*，否则后续绘制阶段再缩小会引入明显的线性滤波“发糊”。
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// 这里始终把区域降采样到不超过 maxOutput*（保持宽高比），让 vips 在解码阶段完成高质量缩放。
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double scale = 1.0;
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if (cw > maxOutputWidth || ch > maxOutputHeight) {
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const double sx = static_cast<double>(maxOutputWidth) / static_cast<double>(cw);
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const double sy = static_cast<double>(maxOutputHeight) / static_cast<double>(ch);
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scale = std::min({sx, sy, 1.0});
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}
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if (scale < 0.9999) {
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VipsImage* resized = nullptr;
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if (vips_resize(cropped, &resized, scale, "kernel", VIPS_KERNEL_LANCZOS3, nullptr) != 0) {
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g_object_unref(cropped);
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return false;
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}
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g_object_unref(cropped);
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toEncode = resized;
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}
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void* buf = nullptr;
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size_t len = 0;
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if (vips_pngsave_buffer(toEncode, &buf, &len, "compression", 3, nullptr) != 0) {
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g_object_unref(toEncode);
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return false;
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}
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g_object_unref(toEncode);
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const bool ok = out->loadFromData(static_cast<const uchar*>(buf), static_cast<int>(len), "PNG");
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g_free(buf);
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return ok && !out->isNull();
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}
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bool VipsBackend::saveRectToPng(const QString& sourcePath, const QRect& rectInSource, const QString& destPngPath) {
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if (!gReady) {
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return false;
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}
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const QByteArray src = encodedPath(sourcePath);
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if (src.isEmpty()) {
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return false;
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}
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VipsImage* in = vips_image_new_from_file(src.constData(), "access", VIPS_ACCESS_RANDOM, nullptr);
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if (!in) {
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return false;
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}
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const int iw = vips_image_get_width(in);
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const int ih = vips_image_get_height(in);
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const QRect bounds(0, 0, iw, ih);
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QRect r = rectInSource.normalized().intersected(bounds);
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if (r.width() <= 0 || r.height() <= 0) {
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g_object_unref(in);
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return false;
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}
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VipsImage* toSave = in;
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VipsImage* cropped = nullptr;
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if (r != bounds) {
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if (vips_crop(in, &cropped, r.left(), r.top(), r.width(), r.height(), nullptr) != 0) {
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g_object_unref(in);
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return false;
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}
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toSave = cropped;
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}
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const bool ok = saveVipsImageToPngFile(toSave, destPngPath);
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if (cropped) {
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g_object_unref(cropped);
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}
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g_object_unref(in);
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return ok;
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}
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#else // !LT_HAVE_VIPS
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bool VipsBackend::init(const char*) {
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return false;
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}
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void VipsBackend::shutdown() {}
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bool VipsBackend::isAvailable() {
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return false;
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}
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bool VipsBackend::probeSize(const QString&, QSize*) {
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return false;
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}
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bool VipsBackend::loadThumbnailQImage(const QString&, qint64, QImage*) {
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return false;
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}
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bool VipsBackend::saveRectToPng(const QString&, const QRect&, const QString&) {
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return false;
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}
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bool VipsBackend::loadRegionToQImage(const QString&, const QRect&, int, int, QImage*) {
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return false;
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}
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#endif // LT_HAVE_VIPS
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} // namespace core
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