usbloadergx/source/background_image.c

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C
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#include <malloc.h>
#include "pngu.h"
#include "video.h"
#include "filelist.h"
static int imagewidth = 0;
static int imageheight = 0;
u8 * GetImageData()
{
PNGUPROP imgProp;
IMGCTX ctx;
u8 * data = NULL;
int ret;
if(CONF_GetAspectRatio() == CONF_ASPECT_16_9)
ctx = PNGU_SelectImageFromBuffer(background169_png);
else
ctx = PNGU_SelectImageFromBuffer(background_png);
if (!ctx)
return NULL;
ret = PNGU_GetImageProperties(ctx, &imgProp);
if (ret != PNGU_OK)
return NULL;
imagewidth = imgProp.imgWidth;
imageheight = imgProp.imgHeight;
int len = ((((imgProp.imgWidth+3)>>2)*((imgProp.imgHeight+3)>>2)*32*2) + 31) & ~31;
data = (u8 *)memalign (32, len);
ret = PNGU_DecodeTo4x4RGBA8 (ctx, imgProp.imgWidth, imgProp.imgHeight, data, 255);
DCFlushRange(data, len);
PNGU_ReleaseImageContext(ctx);
return data;
}
void Background_Show(float x, float y, float z, u8 * data, float angle, float scaleX, float scaleY, u8 alpha)
{
/* Draw image */
Menu_DrawImg(x, y, z, imagewidth, imageheight, data, angle, scaleX, scaleY, alpha);
Menu_Render();
}
void fadein(u8 * imgdata)
{
int i;
/* fadein of image */
for(i = 0; i < 255; i = i+10)
{
if(i>255) i = 255;
Background_Show(0, 0, 0, imgdata, 0, 1, 1, i);
}
}
void fadeout(u8 * imgdata)
{
int i;
/* fadeoout of image */
for(i = 255; i > 1; i = i-7)
{
if(i < 0) i = 0;
Background_Show(0, 0, 0, imgdata, 0, 1, 1, i);
}
}