83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
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#include <jni.h>
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#include <android/native_window_jni.h>
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#include <android/native_window.h>
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#include <android/log.h>
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#define LOG_TAG "NativeRenderer"
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#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
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#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)
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static ANativeWindow* window = nullptr;
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extern "C" JNIEXPORT void JNICALL
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Java_bums_lunatic_launcher_wall_NativeRenderer_nativeInit(JNIEnv* env, jobject, jobject surface) {
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if (window != nullptr) {
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ANativeWindow_release(window);
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window = nullptr;
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}
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window = ANativeWindow_fromSurface(env, surface);
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LOGI("Native window initialized");
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}
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extern "C" JNIEXPORT void JNICALL
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Java_bums_lunatic_launcher_wall_NativeRenderer_nativeRender(
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JNIEnv* env, jobject, jintArray pixels, jint width, jint height,
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jfloat offsetX, jfloat offsetY, jfloat fadeAlpha) {
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if (!window) return;
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ANativeWindow_Buffer buffer;
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if (ANativeWindow_lock(window, &buffer, nullptr) < 0) {
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LOGE("Failed to lock native window");
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return;
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}
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jint* srcPixels = env->GetIntArrayElements(pixels, nullptr);
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if (!srcPixels) {
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ANativeWindow_unlockAndPost(window);
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return;
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}
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uint32_t* dstPixels = (uint32_t*)buffer.bits;
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int stride = buffer.stride;
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int offsetXInt = static_cast<int>(offsetX);
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int offsetYInt = static_cast<int>(offsetY);
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for (int y = 0; y < buffer.height; y++) {
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int srcY = y - offsetYInt;
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if (srcY < 0 || srcY >= height) continue;
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for (int x = 0; x < buffer.width; x++) {
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int srcX = x - offsetXInt;
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if (srcX < 0 || srcX >= width) continue;
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uint32_t pixel = srcPixels[srcY * width + srcX];
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uint8_t alpha = static_cast<uint8_t>(fadeAlpha * 255);
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uint8_t r = (pixel >> 16) & 0xFF;
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uint8_t g = (pixel >> 8) & 0xFF;
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uint8_t b = pixel & 0xFF;
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r = (r * alpha) / 255;
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g = (g * alpha) / 255;
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b = (b * alpha) / 255;
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dstPixels[y * stride + x] = (0xFF << 24) | (r << 16) | (g << 8) | b;
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}
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}
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env->ReleaseIntArrayElements(pixels, srcPixels, JNI_ABORT);
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ANativeWindow_unlockAndPost(window);
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}
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extern "C" JNIEXPORT void JNICALL
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Java_bums_lunatic_launcher_wall_NativeRenderer_nativeDestroy(JNIEnv*, jobject) {
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if (window) {
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ANativeWindow_release(window);
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window = nullptr;
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LOGI("Native window released");
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}
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}
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