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api-impl: implement Canvas text drawing as used by Gravity Defied

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implements android.graphics.Typeface (always uses default
typeface for now), one version of Canvas.drawText, one version
of Paint.measureText, and Paint.ascend
This commit is contained in:
Mis012
2023-09-12 19:30:20 +02:00
parent f25e9b021f
commit 24353378be
10 changed files with 198 additions and 21 deletions
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42
src/api-impl-jni/android_graphics_Paint.c
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@@ -3,7 +3,9 @@
#include "defines.h"
#include "util.h"
#include "../sk_area/include/c/sk_font.h"
#include "../sk_area/include/c/sk_paint.h"
#include "../sk_area/include/c/sk_typeface.h"
#include "generated_headers/android_graphics_Paint.h"
JNIEXPORT jlong JNICALL Java_android_graphics_Paint_native_1constructor(JNIEnv *env, jobject this)
@@ -25,3 +27,43 @@ JNIEXPORT jint JNICALL Java_android_graphics_Paint_native_1get_1color(JNIEnv *en
return sk_paint_get_color(paint);
}
JNIEXPORT jlong JNICALL Java_android_graphics_Paint_native_1create_1font(JNIEnv *env, jclass this)
{
return _INTPTR(sk_font_new()); /* TODO: recycle this */
}
JNIEXPORT void JNICALL Java_android_graphics_Paint_native_1set_1typeface(JNIEnv *env, jclass this, jlong skia_font, jlong skia_typeface)
{
sk_font_t *font = _PTR(skia_font);
sk_typeface_t *typeface = _PTR(skia_typeface);
sk_font_set_typeface(font, typeface);
}
JNIEXPORT void JNICALL Java_android_graphics_Paint_native_1set_1text_1size(JNIEnv *env, jclass this, jlong skia_font, jfloat size)
{
sk_font_t *font = _PTR(skia_font);
sk_font_set_size(font, size);
}
JNIEXPORT jfloat JNICALL Java_android_graphics_Paint_native_1ascent(JNIEnv *env, jclass this, jlong skia_font)
{
sk_font_t *font = _PTR(skia_font);
sk_fontmetrics_t metrics;
sk_font_get_metrics(font, &metrics);
return metrics.fAscent;
}
JNIEXPORT jfloat JNICALL Java_android_graphics_Paint_native_1measure_1text(JNIEnv *env, jclass this, jlong skia_font, jobject _text, jint start, jint end, jlong skia_paint)
{
sk_font_t *font = _PTR(skia_font);
sk_paint_t *paint = (sk_paint_t *)_PTR(skia_paint);
const char *text = _CSTRING(_text);
return sk_font_measure_text(font, text + start, end - start, UTF8_SK_TEXT_ENCODING, NULL, paint);
}