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Paint: implement textAlign and text bounds

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This commit is contained in:
Julian Winkler
2025-02-18 18:58:58 +01:00
parent 587aeaba74
commit 4bb5dfd86e
5 changed files with 70 additions and 7 deletions
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2
src/api-impl-jni/graphics/AndroidPaint.h
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@@ -1,3 +1,4 @@
#include "pango/pango-layout.h"
#include <gdk/gdk.h>
#include <gsk/gsk.h>
#include <pango/pango.h>
@@ -6,6 +7,7 @@ struct AndroidPaint {
GdkRGBA color;
GskStroke *gsk_stroke;
PangoFontDescription *font;
PangoAlignment alignment;
graphene_matrix_t color_matrix;
graphene_vec4_t color_offset;
bool is_fill:1;

7
src/api-impl-jni/graphics/android_graphics_GskCanvas.c
View File

@@ -102,6 +102,13 @@ JNIEXPORT void JNICALL Java_android_graphics_GskCanvas_native_1drawText(JNIEnv *
const char *str = (*env)->GetStringUTFChars(env, text, NULL);
pango_layout_set_text(layout, str, -1);
(*env)->ReleaseStringUTFChars(env, text, str);
PangoRectangle rect;
pango_layout_get_pixel_extents(layout, NULL, &rect);
y -= rect.height;
if (paint->alignment == PANGO_ALIGN_CENTER)
x -= rect.width / 2.f;
else if (paint->alignment == PANGO_ALIGN_RIGHT)
x -= rect.width;
gtk_snapshot_translate(snapshot, &GRAPHENE_POINT_INIT(x, y));
gtk_snapshot_append_layout(snapshot, layout, &paint->color);
gtk_snapshot_translate(snapshot, &GRAPHENE_POINT_INIT(-x, -y));

26
src/api-impl-jni/graphics/android_graphics_Paint.c
View File

@@ -1,5 +1,6 @@
#include <glib.h>
#include <gsk/gsk.h>
#include <gtk/gtk.h>
#include "AndroidPaint.h"
#include "../defines.h"
@@ -131,3 +132,28 @@ JNIEXPORT void JNICALL Java_android_graphics_Paint_native_1set_1color_1filter(JN
graphene_vec4_init(&paint->color_offset, ((color >> 16) & 0xFF) / 255.f, ((color >> 8) & 0xFF) / 255.f, ((color >> 0) & 0xFF) / 255.f, 0);
paint->use_color_filter = mode != -1;
}
extern GtkWidget *window;
JNIEXPORT void JNICALL Java_android_graphics_Paint_native_1get_1text_1bounds(JNIEnv *env, jclass clazz, jlong paint_ptr, jstring text_ptr, jobject bounds)
{
struct AndroidPaint *paint = _PTR(paint_ptr);
PangoLayout *layout = pango_layout_new(gtk_widget_get_pango_context(window));
pango_layout_set_font_description(layout, paint->font);
const char *str = (*env)->GetStringUTFChars(env, text_ptr, NULL);
pango_layout_set_text(layout, str, -1);
(*env)->ReleaseStringUTFChars(env, text_ptr, str);
PangoRectangle rect;
pango_layout_get_pixel_extents(layout, NULL, &rect);
_SET_INT_FIELD(bounds, "left", rect.x);
_SET_INT_FIELD(bounds, "top", rect.y);
_SET_INT_FIELD(bounds, "right", rect.x + rect.width);
_SET_INT_FIELD(bounds, "bottom", rect.y + rect.height);
g_object_unref(layout);
}
JNIEXPORT void JNICALL Java_android_graphics_Paint_native_1set_1text_1align(JNIEnv *env, jclass clazz, jlong paint_ptr, jint align)
{
struct AndroidPaint *paint = _PTR(paint_ptr);
paint->alignment = align;
}