GraphicsJNI.h revision 54b6cfa9a9e5b861a9930af873580d6dc20f773c 
1#ifndef GraphicsJNI_DEFINED
2#define GraphicsJNI_DEFINED
3
4#include "SkPoint.h"
5#include "SkRect.h"
6#include "SkBitmap.h"
7#include <jni.h>
8
9class SkCanvas;
10class SkPaint;
11class SkPicture;
12
13class GraphicsJNI {
14public:
15    // returns true if an exception is set (and dumps it out to the Log)
16    static bool hasException(JNIEnv*);
17
18    static void get_jrect(JNIEnv*, jobject jrect, int* L, int* T, int* R, int* B);
19    static void set_jrect(JNIEnv*, jobject jrect, int L, int T, int R, int B);
20
21    static SkIRect* jrect_to_irect(JNIEnv*, jobject jrect, SkIRect*);
22    static void irect_to_jrect(const SkIRect&, JNIEnv*, jobject jrect);
23
24    static SkRect* jrectf_to_rect(JNIEnv*, jobject jrectf, SkRect*);
25    static SkRect* jrect_to_rect(JNIEnv*, jobject jrect, SkRect*);
26    static void rect_to_jrectf(const SkRect&, JNIEnv*, jobject jrectf);
27
28    static void set_jpoint(JNIEnv*, jobject jrect, int x, int y);
29
30    static SkIPoint* jpoint_to_ipoint(JNIEnv*, jobject jpoint, SkIPoint* point);
31    static void ipoint_to_jpoint(const SkIPoint& point, JNIEnv*, jobject jpoint);
32
33    static SkPoint* jpointf_to_point(JNIEnv*, jobject jpointf, SkPoint* point);
34    static void point_to_jpointf(const SkPoint& point, JNIEnv*, jobject jpointf);
35
36    static SkCanvas* getNativeCanvas(JNIEnv*, jobject canvas);
37    static SkPaint*  getNativePaint(JNIEnv*, jobject paint);
38    static SkBitmap* getNativeBitmap(JNIEnv*, jobject bitmap);
39    static SkPicture* getNativePicture(JNIEnv*, jobject picture);
40    static SkRegion* getNativeRegion(JNIEnv*, jobject region);
41
42    /** Return the corresponding native config from the java Config enum,
43        or kNo_Config if the java object is null.
44    */
45    static SkBitmap::Config getNativeBitmapConfig(JNIEnv*, jobject jconfig);
46
47    /** Create a java Bitmap object given the native bitmap (required) and optional
48        storage array (may be null). If storage is specified, then it must already be
49        locked, and its native address set as the bitmap's pixels. If storage is null,
50        then the bitmap must be an owner of its natively allocated pixels (via allocPixels).
51        */
52    static jobject createBitmap(JNIEnv* env, SkBitmap* bitmap, bool isMutable,
53                                jbyteArray ninePatch);
54
55    static jobject createRegion(JNIEnv* env, SkRegion* region);
56
57    /** Set a pixelref for the bitmap (needs setConfig to already be called)
58        Returns true on success. If it returns false, then it failed, and the
59        appropriate exception will have been raised.
60    */
61    static bool setJavaPixelRef(JNIEnv*, SkBitmap*, SkColorTable* ctable);
62
63    /** Copy the colors in colors[] to the bitmap, convert to the correct
64        format along the way.
65    */
66    static bool SetPixels(JNIEnv* env, jintArray colors, int srcOffset,
67                          int srcStride, int x, int y, int width, int height,
68                          const SkBitmap& dstBitmap);
69};
70
71class JavaPixelAllocator : public SkBitmap::Allocator {
72public:
73    JavaPixelAllocator(JNIEnv* env);
74    // overrides
75    virtual bool allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable);
76
77private:
78    JNIEnv* fEnv;
79};
80
81class AutoJavaFloatArray {
82public:
83    AutoJavaFloatArray(JNIEnv* env, jfloatArray array, int minLength = 0);
84    ~AutoJavaFloatArray();
85
86    float* ptr() const { return fPtr; }
87    int    length() const { return fLen; }
88
89private:
90    JNIEnv*     fEnv;
91    jfloatArray fArray;
92    float*      fPtr;
93    int         fLen;
94};
95
96class AutoJavaIntArray {
97public:
98    AutoJavaIntArray(JNIEnv* env, jintArray array, int minLength = 0);
99    ~AutoJavaIntArray();
100
101    jint* ptr() const { return fPtr; }
102    int    length() const { return fLen; }
103
104private:
105    JNIEnv*     fEnv;
106    jintArray fArray;
107    jint*      fPtr;
108    int         fLen;
109};
110
111class AutoJavaShortArray {
112public:
113    AutoJavaShortArray(JNIEnv* env, jshortArray array, int minLength = 0);
114    ~AutoJavaShortArray();
115
116    jshort* ptr() const { return fPtr; }
117    int    length() const { return fLen; }
118
119private:
120    JNIEnv*     fEnv;
121    jshortArray fArray;
122    jshort*      fPtr;
123    int         fLen;
124};
125
126class AutoJavaByteArray {
127public:
128    AutoJavaByteArray(JNIEnv* env, jbyteArray array, int minLength = 0);
129    ~AutoJavaByteArray();
130
131    jbyte* ptr() const { return fPtr; }
132    int    length() const { return fLen; }
133
134private:
135    JNIEnv*     fEnv;
136    jbyteArray fArray;
137    jbyte*      fPtr;
138    int         fLen;
139};
140
141void doThrow(JNIEnv* env, const char* exc, const char* msg = NULL);
142void doThrowNPE(JNIEnv* env);
143void doThrowAIOOBE(JNIEnv* env); // Array Index Out Of Bounds Exception
144void doThrowIAE(JNIEnv* env, const char* msg = NULL);   // Illegal Argument
145void doThrowRE(JNIEnv* env, const char* msg = NULL);   // Runtime
146void doThrowISE(JNIEnv* env, const char* msg = NULL);   // Illegal State
147void doThrowOOME(JNIEnv* env, const char* msg = NULL);   // Out of memory
148
149#define NPE_CHECK_RETURN_ZERO(env, object)    \
150    do { if (NULL == (object)) { doThrowNPE(env); return 0; } } while (0)
151
152#define NPE_CHECK_RETURN_VOID(env, object)    \
153    do { if (NULL == (object)) { doThrowNPE(env); return; } } while (0)
154
155#endif
156
157