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src/api-impl: use skia instead of cairo

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Using the C API provided by SkiaSharp's skia fork instead of using cairo
significantly improves performance. The API is also closer to the android
Canvas API, which makes the implementation more straightforward.
This commit is contained in:
Mis012
2023-08-28 20:03:32 +02:00
parent 096919ec37
commit 1e47824a79
47 changed files with 3184 additions and 159 deletions
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77
src/api-impl-jni/android_graphics_Canvas.c
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@@ -3,67 +3,68 @@
#include "defines.h"
#include "util.h"
#include "../sk_area/include/c/sk_canvas.h"
#include "../sk_area/include/c/sk_image.h"
#include "generated_headers/android_graphics_Canvas.h"
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1save(JNIEnv *env, jclass this, jlong cairo_context, jlong widget)
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1save(JNIEnv *env, jclass this, jlong skia_canvas, jlong widget)
{
cairo_t *cr = (cairo_t *)_PTR(cairo_context);
sk_canvas_t *canvas = (sk_canvas_t *)_PTR(skia_canvas);
cairo_save(cr);
sk_canvas_save(canvas);
}
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1restore(JNIEnv *env, jclass this, jlong cairo_context, jlong widget)
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1restore(JNIEnv *env, jclass this, jlong skia_canvas, jlong widget)
{
cairo_t *cr = (cairo_t *)_PTR(cairo_context);
sk_canvas_t *canvas = (sk_canvas_t *)_PTR(skia_canvas);
cairo_restore(cr);
sk_canvas_restore(canvas);
}
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1drawLine(JNIEnv *env, jclass this_class, jlong cairo_context, jlong widget, jfloat start_x, jfloat start_y, jfloat stop_x, jfloat stop_y, jint paint_color)
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1drawLine(JNIEnv *env, jclass this_class, jlong skia_canvas, jlong widget, jfloat start_x, jfloat start_y, jfloat stop_x, jfloat stop_y, jlong skia_paint)
{
cairo_t *cr = (cairo_t *)_PTR(cairo_context);
sk_canvas_t *canvas = (sk_canvas_t *)_PTR(skia_canvas);
sk_paint_t *paint = (sk_paint_t *)_PTR(skia_paint);
// TODO: cairo is not stateless, so we should probably check that the state is not already what we want it to be before we tell cairo to change it
// NOTE: we should make sure that cairo doesn't do this microoptimization internally before we implement it here
char buf[10]; //#rrggbbaa\0
snprintf(buf, 10, "#%06x%02x", paint_color & 0x00FFFFFF, paint_color>>24);
GdkRGBA color;
gdk_rgba_parse(&color, buf);
gdk_cairo_set_source_rgba(cr, &color);
cairo_move_to(cr, start_x, start_y);
cairo_line_to(cr, stop_x, stop_y);
cairo_stroke(cr);
sk_canvas_draw_line(canvas, start_x, start_y, stop_x, stop_y, paint);
}
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1drawBitmap(JNIEnv *env , jclass this_class, jlong cairo_context, jlong widget, jlong _pixbuf, jfloat src_x, jfloat src_y, jfloat dest_x , jfloat dest_y, jfloat dest_w , jfloat dest_h, jobject paint)
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1drawBitmap(JNIEnv *env , jclass this_class, jlong skia_canvas, jlong widget, jlong _pixbuf, jfloat src_x, jfloat src_y, jfloat dest_x , jfloat dest_y, jfloat dest_w , jfloat dest_h, jlong skia_paint)
{
cairo_t *cr = (cairo_t *)_PTR(cairo_context);
sk_canvas_t *canvas = (sk_canvas_t *)_PTR(skia_canvas);
GdkPixbuf *pixbuf = (GdkPixbuf *)_PTR(_pixbuf);
sk_paint_t *paint = (sk_paint_t *)_PTR(skia_paint);
cairo_translate(cr, dest_x, dest_y);
cairo_scale(cr, dest_w / gdk_pixbuf_get_width(pixbuf), dest_h / gdk_pixbuf_get_height(pixbuf));
gdk_cairo_set_source_pixbuf(cr, pixbuf, src_x, src_y);
cairo_paint(cr);
cairo_translate(cr, -dest_x, -dest_y);
sk_image_t *image = g_object_get_data(G_OBJECT(pixbuf), "sk_image");
if(!image) {
fprintf(stderr, "pixbuf doesn't have a skia image associated: %p\n", pixbuf);
return;
}
sk_canvas_draw_image(canvas, image, dest_x, dest_y, paint);
}
// TODO: if we switched to using the snapshot mechanic directly instead of having a DrawingArea, these two could possibly (maybe it clips or something?) be replaced with hw-accelerated Gsk functions
// NOTE: it's unclear whether using the snapshot mechanic would still give us the same cairo context each time, and getting the same cairo context each time sure is convenient
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1rotate(JNIEnv *env, jclass this, jlong cairo_context, jlong widget, jfloat angle)
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1drawRect(JNIEnv *env, jclass this, jlong skia_canvas, jfloat left, jfloat top, jfloat right, jfloat bottom, jlong skia_paint)
{
cairo_t *cr = (cairo_t *)_PTR(cairo_context);
sk_canvas_t *canvas = (sk_canvas_t *)_PTR(skia_canvas);
sk_paint_t *paint = (sk_paint_t *)_PTR(skia_paint);
cairo_rotate(cr, DEG2RAD(angle));
// FIXME: this doesn't work great with dark mode, since the text stays light even if the game draws white background
// sk_canvas_draw_rect(canvas, &(sk_rect_t){left, top, right, bottom}, paint);
}
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1rotate_1and_1translate(JNIEnv *env, jclass this, jlong cairo_context, jlong widget, jfloat angle, jfloat tx, jfloat ty)
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1rotate(JNIEnv *env, jclass this, jlong skia_canvas, jlong widget, jfloat angle)
{
cairo_t *cr = (cairo_t *)_PTR(cairo_context);
sk_canvas_t *canvas = (sk_canvas_t *)_PTR(skia_canvas);
sk_canvas_rotate_degrees(canvas, angle);
}
JNIEXPORT void JNICALL Java_android_graphics_Canvas_native_1rotate_1and_1translate(JNIEnv *env, jclass this, jlong skia_canvas, jlong widget, jfloat angle, jfloat tx, jfloat ty)
{
sk_canvas_t *canvas = (sk_canvas_t *)_PTR(skia_canvas);
sk_canvas_translate(canvas, tx, ty);
sk_canvas_rotate_degrees(canvas, angle);
sk_canvas_translate(canvas, -tx, -ty);
cairo_translate(cr, tx, ty);
cairo_rotate(cr, DEG2RAD(angle));
cairo_translate(cr, -tx, -ty);
}