Hi,
first i am not a C/C++ coder, i stick mor to the VB Side.
But when I locked through the threads about the usb loader develops there are certian cpmpains about a not resizeable image of the cover art.
now, in the pngu.c there is the following part:
int PNGU_DecodeToYCbYCr (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
{
int result;
PNGU_u32 x, y, buffWidth;
// width needs to be divisible by two
if (width % 2)
return PNGU_ODD_WIDTH;
// stride needs to be divisible by two
if (stride % 2)
return PNGU_ODD_STRIDE;
result = pngu_decode (ctx, width, height, 1);
if (result != PNGU_OK)
return result;
// Copy image to the output buffer
buffWidth = (width + stride) / 2;
for (y = 0; y < height; y++)
for (x = 0; x < (width / 2); x++)
((PNGU_u32 *)buffer)[y*buffWidth+x] = PNGU_RGB8_TO_YCbYCr (*(ctx->row_pointers[y]+x*6), *(ctx->row_pointers[y]+x*6+1), *(ctx->row_pointers[y]+x*6+2),
*(ctx->row_pointers[y]+x*6+3), *(ctx->row_pointers[y]+x*6+4), *(ctx->row_pointers[y]+x*6+5));
// Free resources
free (ctx->img_data);
free (ctx->row_pointers);
// Success
return PNGU_OK;
}
What is to output the image to the output buffer.
Would there be a resize way if we let the loops count up for a step of two instead of one ? There would be every second line and every second pixel in the output, correct ?
That would then cut the image to 50% size.
Just ignore me if this is wrong or drop a note whats wrong maybe.
first i am not a C/C++ coder, i stick mor to the VB Side.
But when I locked through the threads about the usb loader develops there are certian cpmpains about a not resizeable image of the cover art.
now, in the pngu.c there is the following part:
int PNGU_DecodeToYCbYCr (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
{
int result;
PNGU_u32 x, y, buffWidth;
// width needs to be divisible by two
if (width % 2)
return PNGU_ODD_WIDTH;
// stride needs to be divisible by two
if (stride % 2)
return PNGU_ODD_STRIDE;
result = pngu_decode (ctx, width, height, 1);
if (result != PNGU_OK)
return result;
// Copy image to the output buffer
buffWidth = (width + stride) / 2;
for (y = 0; y < height; y++)
for (x = 0; x < (width / 2); x++)
((PNGU_u32 *)buffer)[y*buffWidth+x] = PNGU_RGB8_TO_YCbYCr (*(ctx->row_pointers[y]+x*6), *(ctx->row_pointers[y]+x*6+1), *(ctx->row_pointers[y]+x*6+2),
*(ctx->row_pointers[y]+x*6+3), *(ctx->row_pointers[y]+x*6+4), *(ctx->row_pointers[y]+x*6+5));
// Free resources
free (ctx->img_data);
free (ctx->row_pointers);
// Success
return PNGU_OK;
}
What is to output the image to the output buffer.
Would there be a resize way if we let the loops count up for a step of two instead of one ? There would be every second line and every second pixel in the output, correct ?
That would then cut the image to 50% size.
Just ignore me if this is wrong or drop a note whats wrong maybe.
