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package cc.polyfrost.oneconfig.lwjgl.image;
import cc.polyfrost.oneconfig.utils.IOUtils;
import org.lwjgl.nanovg.NSVGImage;
import org.lwjgl.nanovg.NanoSVG;
import org.lwjgl.nanovg.NanoVG;
import org.lwjgl.stb.STBImage;
import org.lwjgl.system.MemoryUtil;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.ByteBuffer;
import java.util.HashMap;
/**
* Loads images and SVGs from resources into NanoVG.
*
* @see cc.polyfrost.oneconfig.lwjgl.RenderManager
* @see Images
* @see SVGs
*/
public final class ImageLoader {
private ImageLoader() {
}
private final HashMap<String, Integer> imageHashMap = new HashMap<>();
private final HashMap<String, Integer> svgHashMap = new HashMap<>();
public static ImageLoader INSTANCE = new ImageLoader();
/**
* Loads an image from resources.
* @param vg The NanoVG context.
* @param fileName The name of the file to load.
* @return Whether the image was loaded successfully.
*/
public boolean loadImage(long vg, String fileName) {
if (!imageHashMap.containsKey(fileName)) {
int[] width = {0};
int[] height = {0};
int[] channels = {0};
ByteBuffer image = IOUtils.resourceToByteBufferNullable(fileName);
if (image == null) {
return false;
}
ByteBuffer buffer = STBImage.stbi_load_from_memory(image, width, height, channels, 4);
if (buffer == null) {
return false;
}
imageHashMap.put(fileName, NanoVG.nvgCreateImageRGBA(vg, width[0], height[0], NanoVG.NVG_IMAGE_REPEATX | NanoVG.NVG_IMAGE_REPEATY | NanoVG.NVG_IMAGE_GENERATE_MIPMAPS, buffer));
return true;
}
return true;
}
/**
* Loads an SVG from resources.
* @param vg The NanoVG context.
* @param fileName The name of the file to load.
* @param width The width of the SVG.
* @param height The height of the SVG.
* @return Whether the SVG was loaded successfully.
*/
public boolean loadSVG(long vg, String fileName, float width, float height) {
String name = fileName + "-" + width + "-" + height;
if (!svgHashMap.containsKey(name)) {
try {
InputStream inputStream = this.getClass().getResourceAsStream(fileName);
if (inputStream == null) return false;
StringBuilder resultStringBuilder = new StringBuilder();
try (BufferedReader br = new BufferedReader(new InputStreamReader(inputStream))) {
String line;
while ((line = br.readLine()) != null) {
resultStringBuilder.append(line);
}
}
CharSequence s = resultStringBuilder.toString();
NSVGImage svg = NanoSVG.nsvgParse(s, "px", 96f);
if (svg == null) return false;
long rasterizer = NanoSVG.nsvgCreateRasterizer();
int w = (int) svg.width();
int h = (int) svg.height();
float scale = Math.max(width / w, height / h);
w = (int) (w * scale);
h = (int) (h * scale);
ByteBuffer image = MemoryUtil.memAlloc(w * h * 4);
NanoSVG.nsvgRasterize(rasterizer, svg, 0, 0, scale, image, w, h, w * 4);
NanoSVG.nsvgDeleteRasterizer(rasterizer);
NanoSVG.nsvgDelete(svg);
svgHashMap.put(name, NanoVG.nvgCreateImageRGBA(vg, w, h, NanoVG.NVG_IMAGE_REPEATX | NanoVG.NVG_IMAGE_REPEATY | NanoVG.NVG_IMAGE_GENERATE_MIPMAPS, image));
return true;
} catch (Exception e) {
System.err.println("Failed to parse SVG file");
e.printStackTrace();
return false;
}
}
return true;
}
/**
* Get a loaded image from the cache.
* <p><b>Requires the image to have been loaded first.</b></p>
*
* @param fileName The name of the file to load.
* @return The image
* @see ImageLoader#loadImage(long, String)
*/
public int getImage(String fileName) {
return imageHashMap.get(fileName);
}
/**
* Remove an image from the cache, allowing the image to be garbage collected.
* Should be used when the GUI rendering the image is closed.
*
* @param vg The NanoVG context.
* @param fileName The name of the file to remove.
*
* @see ImageLoader#loadImage(long, String)
*/
public void removeImage(long vg, String fileName) {
NanoVG.nvgDeleteImage(vg, imageHashMap.get(fileName));
imageHashMap.remove(fileName);
}
/**
* Clears all images from the cache, allowing the images cleared to be garbage collected.
* Should be used when the GUI rendering loaded images are closed.
*
* @param vg The NanoVG context.
*/
public void clearImages(long vg) {
HashMap<String, Integer> temp = new HashMap<>(imageHashMap);
for (String image : temp.keySet()) {
NanoVG.nvgDeleteImage(vg, imageHashMap.get(image));
imageHashMap.remove(image);
}
}
/**
* Get a loaded SVG from the cache.
* <p><b>Requires the SVG to have been loaded first.</b></p>
*
* @param fileName The name of the file to load.
* @return The SVG
* @see ImageLoader#loadSVG(long, String, float, float)
*/
public int getSVG(String fileName, float width, float height) {
String name = fileName + "-" + width + "-" + height;
return svgHashMap.get(name);
}
/**
* Remove a SVG from the cache, allowing the SVG to be garbage collected.
* Should be used when the GUI rendering the SVG is closed.
*
* @param vg The NanoVG context.
* @param fileName The name of the file to remove.
*
* @see ImageLoader#loadSVG(long, String, float, float)
*/
public void removeSVG(long vg, String fileName, float width, float height) {
String name = fileName + "-" + width + "-" + height;
NanoVG.nvgDeleteImage(vg, imageHashMap.get(name));
svgHashMap.remove(name);
}
/**
* Clears all SVGs from the cache, allowing the SVGs cleared to be garbage collected.
* Should be used when the GUI rendering loaded SVGs are closed.
*
* @param vg The NanoVG context.
*/
public void clearSVGs(long vg) {
HashMap<String, Integer> temp = new HashMap<>(svgHashMap);
for (String image : temp.keySet()) {
NanoVG.nvgDeleteImage(vg, svgHashMap.get(image));
svgHashMap.remove(image);
}
}
}
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