ppsspp/ext/native/gfx_es2/draw_text_android.cpp

#include "base/display.h"
#include "base/logging.h"
#include "base/stringutil.h"
#include "thin3d/thin3d.h"
#include "util/hash/hash.h"
#include "util/text/wrap_text.h"
#include "util/text/utf8.h"
#include "gfx_es2/draw_text.h"
#include "gfx_es2/draw_text_android.h"

#include "android/jni/app-android.h"

#if PPSSPP_PLATFORM(ANDROID)

#include <jni.h>

TextDrawerAndroid::TextDrawerAndroid(Draw::DrawContext *draw) : TextDrawer(draw) {
	env_ = jniEnvGraphics;
	const char *textRendererClassName = "org/ppsspp/ppsspp/TextRenderer";
	cls_textRenderer = env_->FindClass(textRendererClassName);
	ILOG("cls_textRender: %p", cls_textRenderer);
	if (cls_textRenderer) {
		method_measureText = env_->GetStaticMethodID(cls_textRenderer, "measureText", "(Ljava/lang/String;F)I");
		ILOG("method_measureText: %p", method_measureText);
		method_renderText = env_->GetStaticMethodID(cls_textRenderer, "renderText", "(Ljava/lang/String;F)[S");
		ILOG("method_renderText: %p", method_renderText);
	} else {
		ELOG("Failed to find class: %s", textRendererClassName);
	}
	curSize_ = 12;
}

TextDrawerAndroid::~TextDrawerAndroid() {
	ClearCache();
}

bool TextDrawerAndroid::IsReady() const {
	return cls_textRenderer != nullptr && method_measureText != nullptr && method_renderText != nullptr;
}

uint32_t TextDrawerAndroid::SetFont(const char *fontName, int size, int flags) {
	// We will only use the default font
	uint32_t fontHash = 0; //hash::Fletcher((const uint8_t *)fontName, strlen(fontName));
	fontHash ^= size;
	fontHash ^= flags << 10;

	auto iter = fontMap_.find(fontHash);
	if (iter != fontMap_.end()) {
		fontHash_ = fontHash;
		return fontHash;
	}

	curSize_ = size;
	AndroidFontEntry entry;
	entry.size = curSize_;
	fontMap_[fontHash] = entry;
	fontHash_ = fontHash;
	return fontHash;
}

void TextDrawerAndroid::SetFont(uint32_t fontHandle) {
	uint32_t fontHash = fontHandle;
	auto iter = fontMap_.find(fontHash);
	if (iter != fontMap_.end()) {
		curSize_ = iter->second.size;
	}
}

void TextDrawerAndroid::RecreateFonts() {

}

void TextDrawerAndroid::MeasureString(const char *str, size_t len, float *w, float *h) {
	std::string stdstring(str, len);
	jstring jstr = env_->NewStringUTF(stdstring.c_str());
	uint32_t size = env_->CallStaticIntMethod(cls_textRenderer, method_measureText, jstr, curSize_);
	*w = (size >> 16) * fontScaleX_;
	*h = (size & 0xFFFF) * fontScaleY_;
	env_->DeleteLocalRef(jstr);
}

void TextDrawerAndroid::MeasureStringRect(const char *str, size_t len, const Bounds &bounds, float *w, float *h, int align) {
	std::string toMeasure = std::string(str, len);
	if (align & FLAG_WRAP_TEXT) {
		bool rotated = (align & (ROTATE_90DEG_LEFT | ROTATE_90DEG_RIGHT)) != 0;
		WrapString(toMeasure, toMeasure.c_str(), rotated ? bounds.h : bounds.w);
	}

	jstring jstr = env_->NewStringUTF(toMeasure.c_str());
	uint32_t size = env_->CallStaticIntMethod(cls_textRenderer, method_measureText, jstr, curSize_);
	*w = (size >> 16) * fontScaleX_;
	*h = (size & 0xFFFF) * fontScaleY_;
	env_->DeleteLocalRef(jstr);
}

void TextDrawerAndroid::DrawString(DrawBuffer &target, const char *str, float x, float y, uint32_t color, int align) {
	using namespace Draw;
	if (!strlen(str))
		return;

	uint32_t stringHash = hash::Fletcher((const uint8_t *)str, strlen(str));
	uint32_t entryHash = stringHash ^ fontHash_ ^ (align << 24);

	target.Flush(true);

	TextStringEntry *entry;

	auto iter = cache_.find(entryHash);
	if (iter != cache_.end()) {
		entry = iter->second.get();
		entry->lastUsedFrame = frameCount_;
		draw_->BindTexture(0, entry->texture);
	} else {
		jstring jstr = env_->NewStringUTF(str);
		uint32_t size = env_->CallStaticIntMethod(cls_textRenderer, method_measureText, jstr, curSize_);
		int imageWidth = (size >> 16) * fontScaleX_;
		int imageHeight = (size & 0xFFFF) * fontScaleY_;
		jshortArray imageData = (jshortArray)env_->CallStaticObjectMethod(cls_textRenderer, method_renderText, jstr, curSize_);
		env_->DeleteLocalRef(jstr);

		entry = new TextStringEntry();
		entry->bmWidth = entry->width = imageWidth;
		entry->bmHeight = entry->height = imageHeight;
		entry->lastUsedFrame = frameCount_;

		TextureDesc desc{};
		desc.type = TextureType::LINEAR2D;
		desc.format = Draw::DataFormat::B4G4R4A4_UNORM_PACK16;
		desc.width = entry->bmWidth;
		desc.height = entry->bmHeight;
		desc.depth = 1;
		desc.mipLevels = 1;

		uint16_t *bitmapData = new uint16_t[entry->bmWidth * entry->bmHeight];
		jshort* jimage = env_->GetShortArrayElements(imageData, nullptr);
		for (int x = 0; x < entry->bmWidth; x++) {
			for (int y = 0; y < entry->bmHeight; y++) {
				int v = jimage[imageWidth * y + x];
				v = (v << 4) | v;
				v = (v << 8) | v;
				bitmapData[entry->bmWidth * y + x] = v;
			}
		}
		env_->ReleaseShortArrayElements(imageData, jimage, 0);
		desc.initData.push_back((uint8_t *)bitmapData);
		entry->texture = draw_->CreateTexture(desc);
		delete[] bitmapData;
		cache_[entryHash] = std::unique_ptr<TextStringEntry>(entry);
	}
	float w = entry->bmWidth * fontScaleX_;
	float h = entry->bmHeight * fontScaleY_;
	DrawBuffer::DoAlign(align, &x, &y, &w, &h);
	target.DrawTexRect(x, y, x + w, y + h, 0.0f, 0.0f, 1.0f, 1.0f, color);
	target.Flush(true);
}

void TextDrawerAndroid::ClearCache() {
	for (auto &iter : cache_) {
		if (iter.second->texture)
			iter.second->texture->Release();
	}
	cache_.clear();
	sizeCache_.clear();
}

void TextDrawerAndroid::DrawStringRect(DrawBuffer &target, const char *str, const Bounds &bounds, uint32_t color, int align) {
	float x = bounds.x;
	float y = bounds.y;
	if (align & ALIGN_HCENTER) {
		x = bounds.centerX();
	} else if (align & ALIGN_RIGHT) {
		x = bounds.x2();
	}
	if (align & ALIGN_VCENTER) {
		y = bounds.centerY();
	} else if (align & ALIGN_BOTTOM) {
		y = bounds.y2();
	}

	std::string toDraw = str;
	if (align & FLAG_WRAP_TEXT) {
		bool rotated = (align & (ROTATE_90DEG_LEFT | ROTATE_90DEG_RIGHT)) != 0;
		WrapString(toDraw, str, rotated ? bounds.h : bounds.w);
	}

	DrawString(target, toDraw.c_str(), x, y, color, align);
}

void TextDrawerAndroid::OncePerFrame() {
	frameCount_++;
	// If DPI changed (small-mode, future proper monitor DPI support), drop everything.
	float newDpiScale = CalculateDPIScale();
	if (newDpiScale != dpiScale_) {
		dpiScale_ = newDpiScale;
		ClearCache();
		RecreateFonts();
	}

	// Drop old strings. Use a prime number to reduce clashing with other rhythms
	if (frameCount_ % 23 == 0) {
		for (auto iter = cache_.begin(); iter != cache_.end();) {
			if (frameCount_ - iter->second->lastUsedFrame > 100) {
				if (iter->second->texture)
					iter->second->texture->Release();
				cache_.erase(iter++);
			} else {
				iter++;
			}
		}

		for (auto iter = sizeCache_.begin(); iter != sizeCache_.end(); ) {
			if (frameCount_ - iter->second->lastUsedFrame > 100) {
				sizeCache_.erase(iter++);
			} else {
				iter++;
			}
		}
	}
}

#endif