1.plasma.c
* Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. *//** 导入头文件 **/#include <jni.h>#include <time.h>#include <android/log.h>#include <android/bitmap.h>#include <stdio.h>#include <stdlib.h>#include <math.h>
/** log **/
#define LOG_TAG "libplasma"#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)/* Set to 1 to enable debug log traces. */#define DEBUG 0/* Set to 1 to optimize memory stores when generating plasma. */#define OPTIMIZE_WRITES 1/* Return current time in milliseconds */static double now_ms(void){ struct timeval tv; gettimeofday(&tv, NULL); return tv.tv_sec*1000. + tv.tv_usec/1000.;}/* We're going to perform computations for every pixel of the target * bitmap. floating-point operations are very slow on ARMv5, and not * too bad on ARMv7 with the exception of trigonometric functions. * * For better performance on all platforms, we're going to use fixed-point * arithmetic and all kinds of tricks */typedef int32_t Fixed;#define FIXED_BITS 16#define FIXED_ONE (1 << FIXED_BITS)#define FIXED_AVERAGE(x,y) (((x) + (y)) >> 1)#define FIXED_FROM_INT(x) ((x) << FIXED_BITS)#define FIXED_TO_INT(x) ((x) >> FIXED_BITS)#define FIXED_FROM_FLOAT(x) ((Fixed)((x)*FIXED_ONE))#define FIXED_TO_FLOAT(x) ((x)/(1.*FIXED_ONE))#define FIXED_MUL(x,y) (((int64_t)(x) * (y)) >> FIXED_BITS)#define FIXED_DIV(x,y) (((int64_t)(x) * FIXED_ONE) / (y))#define FIXED_DIV2(x) ((x) >> 1)#define FIXED_AVERAGE(x,y) (((x) + (y)) >> 1)#define FIXED_FRAC(x) ((x) & ((1 << FIXED_BITS)-1))#define FIXED_TRUNC(x) ((x) & ~((1 << FIXED_BITS)-1))#define FIXED_FROM_INT_FLOAT(x,f) (Fixed)((x)*(FIXED_ONE*(f)))typedef int32_t Angle;#define ANGLE_BITS 9#if ANGLE_BITS < 8# error ANGLE_BITS must be at least 8#endif#define ANGLE_2PI (1 << ANGLE_BITS)#define ANGLE_PI (1 << (ANGLE_BITS-1))#define ANGLE_PI2 (1 << (ANGLE_BITS-2))#define ANGLE_PI4 (1 << (ANGLE_BITS-3))#define ANGLE_FROM_FLOAT(x) (Angle)((x)*ANGLE_PI/M_PI)#define ANGLE_TO_FLOAT(x) ((x)*M_PI/ANGLE_PI)#if ANGLE_BITS <= FIXED_BITS# define ANGLE_FROM_FIXED(x) (Angle)((x) >> (FIXED_BITS - ANGLE_BITS))# define ANGLE_TO_FIXED(x) (Fixed)((x) << (FIXED_BITS - ANGLE_BITS))#else# define ANGLE_FROM_FIXED(x) (Angle)((x) << (ANGLE_BITS - FIXED_BITS))# define ANGLE_TO_FIXED(x) (Fixed)((x) >> (ANGLE_BITS - FIXED_BITS))#endifstatic Fixed angle_sin_tab[ANGLE_2PI+1];static void init_angles(void){ int nn; for (nn = 0; nn < ANGLE_2PI+1; nn++) { double radians = nn*M_PI/ANGLE_PI; angle_sin_tab[nn] = FIXED_FROM_FLOAT(sin(radians)); }}static __inline__ Fixed angle_sin( Angle a ){ return angle_sin_tab[(uint32_t)a & (ANGLE_2PI-1)];}static __inline__ Fixed angle_cos( Angle a ){ return angle_sin(a + ANGLE_PI2);}static __inline__ Fixed fixed_sin( Fixed f ){ return angle_sin(ANGLE_FROM_FIXED(f));}static __inline__ Fixed fixed_cos( Fixed f ){ return angle_cos(ANGLE_FROM_FIXED(f));}/* Color palette used for rendering the plasma */#define PALETTE_BITS 8#define PALETTE_SIZE (1 << PALETTE_BITS)#if PALETTE_BITS > FIXED_BITS# error PALETTE_BITS must be smaller than FIXED_BITS #endifstatic uint16_t palette[PALETTE_SIZE];static uint16_t make565(int red, int green, int blue){ return (uint16_t)( ((red << 8) & 0xf800) | ((green << 2) & 0x03e0) | ((blue >> 3) & 0x001f) );}static void init_palette(void){ int nn, mm = 0; /* fun with colors */ for (nn = 0; nn < PALETTE_SIZE/4; nn++) { int jj = (nn-mm)*4*255/PALETTE_SIZE; palette[nn] = make565(255, jj, 255-jj); } for ( mm = nn; nn < PALETTE_SIZE/2; nn++ ) { int jj = (nn-mm)*4*255/PALETTE_SIZE; palette[nn] = make565(255-jj, 255, jj); } for ( mm = nn; nn < PALETTE_SIZE*3/4; nn++ ) { int jj = (nn-mm)*4*255/PALETTE_SIZE; palette[nn] = make565(0, 255-jj, 255); } for ( mm = nn; nn < PALETTE_SIZE; nn++ ) { int jj = (nn-mm)*4*255/PALETTE_SIZE; palette[nn] = make565(jj, 0, 255); }}static __inline__ uint16_t palette_from_fixed( Fixed x ){ if (x < 0) x = -x; if (x >= FIXED_ONE) x = FIXED_ONE-1; int idx = FIXED_FRAC(x) >> (FIXED_BITS - PALETTE_BITS); return palette[idx & (PALETTE_SIZE-1)];}/* Angles expressed as fixed point radians */static void init_tables(void){ init_palette(); init_angles();}static void fill_plasma( AndroidBitmapInfo* info, void* pixels, double t ){ Fixed ft = FIXED_FROM_FLOAT(t/1000.); Fixed yt1 = FIXED_FROM_FLOAT(t/1230.); Fixed yt2 = yt1; Fixed xt10 = FIXED_FROM_FLOAT(t/3000.); Fixed xt20 = xt10;#define YT1_INCR FIXED_FROM_FLOAT(1/100.)#define YT2_INCR FIXED_FROM_FLOAT(1/163.) int yy; for (yy = 0; yy < info->height; yy++) { uint16_t* line = (uint16_t*)pixels; Fixed base = fixed_sin(yt1) + fixed_sin(yt2); Fixed xt1 = xt10; Fixed xt2 = xt20; yt1 += YT1_INCR; yt2 += YT2_INCR;#define XT1_INCR FIXED_FROM_FLOAT(1/173.)#define XT2_INCR FIXED_FROM_FLOAT(1/242.)#if OPTIMIZE_WRITES /* optimize memory writes by generating one aligned 32-bit store * for every pair of pixels. */ uint16_t* line_end = line + info->width; if (line < line_end) { if (((uint32_t)line & 3) != 0) { Fixed ii = base + fixed_sin(xt1) + fixed_sin(xt2); xt1 += XT1_INCR; xt2 += XT2_INCR; line[0] = palette_from_fixed(ii >> 2); line++; } while (line + 2 <= line_end) { Fixed i1 = base + fixed_sin(xt1) + fixed_sin(xt2); xt1 += XT1_INCR; xt2 += XT2_INCR; Fixed i2 = base + fixed_sin(xt1) + fixed_sin(xt2); xt1 += XT1_INCR; xt2 += XT2_INCR; uint32_t pixel = ((uint32_t)palette_from_fixed(i1 >> 2) << 16) | (uint32_t)palette_from_fixed(i2 >> 2); ((uint32_t*)line)[0] = pixel; line += 2; } if (line < line_end) { Fixed ii = base + fixed_sin(xt1) + fixed_sin(xt2); line[0] = palette_from_fixed(ii >> 2); line++; } }#else /* !OPTIMIZE_WRITES */ int xx; for (xx = 0; xx < info->width; xx++) { Fixed ii = base + fixed_sin(xt1) + fixed_sin(xt2); xt1 += XT1_INCR; xt2 += XT2_INCR; line[xx] = palette_from_fixed(ii / 4); }#endif /* !OPTIMIZE_WRITES */ // go to next line pixels = (char*)pixels + info->stride; }}/* simple stats management */typedef struct { double renderTime; double frameTime;} FrameStats;#define MAX_FRAME_STATS 200#define MAX_PERIOD_MS 1500typedef struct { double firstTime; double lastTime; double frameTime; int firstFrame; int numFrames; FrameStats frames[ MAX_FRAME_STATS ];} Stats;static voidstats_init( Stats* s ){ s->lastTime = now_ms(); s->firstTime = 0.; s->firstFrame = 0; s->numFrames = 0;}static voidstats_startFrame( Stats* s ){ s->frameTime = now_ms();}static voidstats_endFrame( Stats* s ){ double now = now_ms(); double renderTime = now - s->frameTime; double frameTime = now - s->lastTime; int nn; if (now - s->firstTime >= MAX_PERIOD_MS) { if (s->numFrames > 0) { double minRender, maxRender, avgRender; double minFrame, maxFrame, avgFrame; int count; nn = s->firstFrame; minRender = maxRender = avgRender = s->frames[nn].renderTime; minFrame = maxFrame = avgFrame = s->frames[nn].frameTime; for (count = s->numFrames; count > 0; count-- ) { nn += 1; if (nn >= MAX_FRAME_STATS) nn -= MAX_FRAME_STATS; double render = s->frames[nn].renderTime; if (render < minRender) minRender = render; if (render > maxRender) maxRender = render; double frame = s->frames[nn].frameTime; if (frame < minFrame) minFrame = frame; if (frame > maxFrame) maxFrame = frame; avgRender += render; avgFrame += frame; } avgRender /= s->numFrames; avgFrame /= s->numFrames; LOGI("frame/s (avg,min,max) = (%.1f,%.1f,%.1f) " "render time ms (avg,min,max) = (%.1f,%.1f,%.1f)\n", 1000./avgFrame, 1000./maxFrame, 1000./minFrame, avgRender, minRender, maxRender); } s->numFrames = 0; s->firstFrame = 0; s->firstTime = now; } nn = s->firstFrame + s->numFrames; if (nn >= MAX_FRAME_STATS) nn -= MAX_FRAME_STATS; s->frames[nn].renderTime = renderTime; s->frames[nn].frameTime = frameTime; if (s->numFrames < MAX_FRAME_STATS) { s->numFrames += 1; } else { s->firstFrame += 1; if (s->firstFrame >= MAX_FRAME_STATS) s->firstFrame -= MAX_FRAME_STATS; } s->lastTime = now;}JNIEXPORT void JNICALL Java_com_example_plasma_PlasmaView_renderPlasma(JNIEnv * env, jobject obj, jobject bitmap, jlong time_ms){ AndroidBitmapInfo info; void* pixels; int ret; static Stats stats; static int init; if (!init) { init_tables(); stats_init(&stats); init = 1; } if ((ret = AndroidBitmap_getInfo(env, bitmap, &info)) < 0) { LOGE("AndroidBitmap_getInfo() failed ! error=%d", ret); return; } if (info.format != ANDROID_BITMAP_FORMAT_RGB_565) { LOGE("Bitmap format is not RGB_565 !"); return; } if ((ret = AndroidBitmap_lockPixels(env, bitmap, &pixels)) < 0) { LOGE("AndroidBitmap_lockPixels() failed ! error=%d", ret); } stats_startFrame(&stats); /* Now fill the values with a nice little plasma */ fill_plasma(&info, pixels, time_ms ); AndroidBitmap_unlockPixels(env, bitmap); stats_endFrame(&stats);}通过传入时间，来进行Bitmap像数变化的动态图
