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For GPU textures, the GdkTextureDownloader will take care of format conversions, so the application never sees the actual format. If the application calls AndroidBitmap_unlockPixels(), the texture is converted into a GdkMemoryTexture and can be accessed zero copy.
82 lines
3.0 KiB
C
82 lines
3.0 KiB
C
#include <gdk/gdk.h>
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#include <jni.h>
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#include <stdio.h>
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// FIXME: put the header in a common place
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#include "../api-impl-jni/defines.h"
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#define ANDROID_BITMAP_RESULT_SUCCESS 0
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struct AndroidBitmapInfo {
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uint32_t width;
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uint32_t height;
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uint32_t stride;
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int32_t format;
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uint32_t flags;
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};
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int AndroidBitmap_getInfo(JNIEnv* env, jobject bitmap, struct AndroidBitmapInfo *info)
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{
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info->width = _GET_INT_FIELD(bitmap, "width");
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info->height = _GET_INT_FIELD(bitmap, "height");
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info->stride = _GET_INT_FIELD(bitmap, "stride");
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info->format = _GET_INT_FIELD(_GET_OBJ_FIELD(bitmap, "config", "Landroid/graphics/Bitmap$Config;"), "android_memory_format");
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return ANDROID_BITMAP_RESULT_SUCCESS;
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}
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int AndroidBitmap_lockPixels(JNIEnv* env, jobject bitmap, void** pixels)
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{
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printf("AndroidBitmap_lockPixels\n");
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GdkTexture *texture = _PTR((*env)->CallLongMethod(env, bitmap, _METHOD(_CLASS(bitmap), "getTexture", "()J")));
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int stride = _GET_INT_FIELD(bitmap, "stride");
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int format = _GET_INT_FIELD(_GET_OBJ_FIELD(bitmap, "config", "Landroid/graphics/Bitmap$Config;"), "gdk_memory_format");
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if (format == -1) {
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printf("AndroidBitmap_lockPixels: format not implemented\n");
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exit(1);
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}
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GdkTextureDownloader *downloader = gdk_texture_downloader_new(texture);
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gdk_texture_downloader_set_format(downloader, format);
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GBytes *bytes = NULL;
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if (GDK_IS_MEMORY_TEXTURE(texture)) { // try to get the bytes non-copying
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gsize texture_stride;
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bytes = gdk_texture_downloader_download_bytes(downloader, &texture_stride);
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if (texture_stride != stride) { // texture was not created by us, fall back to copy
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g_bytes_unref(bytes);
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bytes = NULL;
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}
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}
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if (bytes == NULL) {
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guchar *data = g_malloc(stride * gdk_texture_get_height(texture));
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gdk_texture_downloader_download_into(downloader, data, stride);
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bytes = g_bytes_new_take(data, stride * gdk_texture_get_height(texture));
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}
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gdk_texture_downloader_free(downloader);
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_SET_LONG_FIELD(bitmap, "bytes", _INTPTR(bytes));
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*pixels = (void *)g_bytes_get_data(bytes, NULL);
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return ANDROID_BITMAP_RESULT_SUCCESS;
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}
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int AndroidBitmap_unlockPixels(JNIEnv* env, jobject bitmap)
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{
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printf("AndroidBitmap_unlockPixels\n");
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GBytes *bytes = _PTR(_GET_LONG_FIELD(bitmap, "bytes"));
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if (!bytes) {
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printf("AndroidBitmap_unlockPixels: no bytes! Was AndroidBitmap_lockPixels called?\n");
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exit(1);
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}
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int width = _GET_INT_FIELD(bitmap, "width");
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int height = _GET_INT_FIELD(bitmap, "height");
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int stride = _GET_INT_FIELD(bitmap, "stride");
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int format = _GET_INT_FIELD(_GET_OBJ_FIELD(bitmap, "config", "Landroid/graphics/Bitmap$Config;"), "gdk_memory_format");
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if (format == -1) {
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printf("AndroidBitmap_lockPixels: format not implemented\n");
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exit(1);
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}
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GdkTexture *texture = gdk_memory_texture_new(width, height, format, bytes, stride);
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g_bytes_unref(bytes);
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(*env)->CallVoidMethod(env, bitmap, _METHOD(_CLASS(bitmap), "recycle", "()V"));
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_SET_LONG_FIELD(bitmap, "texture", _INTPTR(texture));
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_SET_LONG_FIELD(bitmap, "bytes", 0);
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return ANDROID_BITMAP_RESULT_SUCCESS;
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}
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