GraphicsJNI.h revision 11ea33471e1a14a8594f0b2cd012d86340dd3bd8 
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                                bool reportSizeToVM);
63
64    /** Copy the colors in colors[] to the bitmap, convert to the correct
65        format along the way.
66    */
67    static bool SetPixels(JNIEnv* env, jintArray colors, int srcOffset,
68                          int srcStride, int x, int y, int width, int height,
69                          const SkBitmap& dstBitmap);
70};
71
72class JavaPixelAllocator : public SkBitmap::Allocator {
73public:
74    JavaPixelAllocator(JNIEnv* env, bool reportSizeToVM);
75    // overrides
76    virtual bool allocPixelRef(SkBitmap* bitmap, SkColorTable* ctable);
77
78private:
79    JNIEnv* fEnv;
80    bool fReportSizeToVM;
81};
82
83class AutoJavaFloatArray {
84public:
85    AutoJavaFloatArray(JNIEnv* env, jfloatArray array, int minLength = 0);
86    ~AutoJavaFloatArray();
87
88    float* ptr() const { return fPtr; }
89    int    length() const { return fLen; }
90
91private:
92    JNIEnv*     fEnv;
93    jfloatArray fArray;
94    float*      fPtr;
95    int         fLen;
96};
97
98class AutoJavaIntArray {
99public:
100    AutoJavaIntArray(JNIEnv* env, jintArray array, int minLength = 0);
101    ~AutoJavaIntArray();
102
103    jint* ptr() const { return fPtr; }
104    int    length() const { return fLen; }
105
106private:
107    JNIEnv*     fEnv;
108    jintArray fArray;
109    jint*      fPtr;
110    int         fLen;
111};
112
113class AutoJavaShortArray {
114public:
115    AutoJavaShortArray(JNIEnv* env, jshortArray array, int minLength = 0);
116    ~AutoJavaShortArray();
117
118    jshort* ptr() const { return fPtr; }
119    int    length() const { return fLen; }
120
121private:
122    JNIEnv*     fEnv;
123    jshortArray fArray;
124    jshort*      fPtr;
125    int         fLen;
126};
127
128class AutoJavaByteArray {
129public:
130    AutoJavaByteArray(JNIEnv* env, jbyteArray array, int minLength = 0);
131    ~AutoJavaByteArray();
132
133    jbyte* ptr() const { return fPtr; }
134    int    length() const { return fLen; }
135
136private:
137    JNIEnv*     fEnv;
138    jbyteArray fArray;
139    jbyte*      fPtr;
140    int         fLen;
141};
142
143void doThrow(JNIEnv* env, const char* exc, const char* msg = NULL);
144void doThrowNPE(JNIEnv* env);
145void doThrowAIOOBE(JNIEnv* env); // Array Index Out Of Bounds Exception
146void doThrowIAE(JNIEnv* env, const char* msg = NULL);   // Illegal Argument
147void doThrowRE(JNIEnv* env, const char* msg = NULL);   // Runtime
148void doThrowISE(JNIEnv* env, const char* msg = NULL);   // Illegal State
149void doThrowOOME(JNIEnv* env, const char* msg = NULL);   // Out of memory
150
151#define NPE_CHECK_RETURN_ZERO(env, object)    \
152    do { if (NULL == (object)) { doThrowNPE(env); return 0; } } while (0)
153
154#define NPE_CHECK_RETURN_VOID(env, object)    \
155    do { if (NULL == (object)) { doThrowNPE(env); return; } } while (0)
156
157#endif
158
159