const BitmapData* BitmapData::fromAsset(const char* name)
{
loom_asset_image_t* img = static_cast<loom_asset_image_t*>(loom_asset_lock(name, LATImage, 1));
loom_asset_unlock(name);
if (img == NULL)
return NULL;
BitmapData* result = lmNew(NULL) BitmapData(
(size_t)img->width,
(size_t)img->height
);
if (result == NULL) {
lmLogError(gGFXLogGroup, "Unable to allocate memory for BitmapData asset data");
return NULL;
}
memcpy(result->data, img->bits, img->width * img->height * DATA_BPP);
return result;
}
static int __stdcall scaleImageOnDisk_body(void *param)
{
// Grab our arguments.
RescaleNote *rn = (RescaleNote *)param;
const char *outPath = rn->outPath.c_str();
const char *inPath = rn->inPath.c_str();
int outWidth = rn->outWidth;
int outHeight = rn->outHeight;
bool preserveAspect = rn->preserveAspect;
// Load the image. We always work in 4 components (rgba).
int t0 = platform_getMilliseconds();
loom_asset_image *lai = NULL;
// Load async since we're in a background thread.
while ((lai = (loom_asset_image *)loom_asset_lock(inPath, LATImage, 0)) == NULL)
{
loom_thread_yield();
}
int imageX = lai->width;
int imageY = lai->height;
stbi_uc *imageBits = (stbi_uc *)lai->bits;
lmLog(gGFXTextureLogGroup, "Image setup took %dms", t0 - platform_getMilliseconds());
int t1 = platform_getMilliseconds();
// Resize to fit within the specified size preserving aspect ratio, if flag is set.
if (preserveAspect)
{
float scaleX = float(outWidth) / float(imageX);
float scaleY = float(outHeight) / float(imageY);
float actualScale = (scaleX < scaleY) ? scaleX : scaleY;
outWidth = (int)(imageX * actualScale);
outHeight = (int)(imageY * actualScale);
lmLog(gGFXTextureLogGroup, "Scale to %d %d due to scale %f %f actual=%f", outWidth, outHeight, scaleX, scaleY, actualScale);
}
// Build a buffer for byte->float conversions...
Resampler::Sample *buffRed = (Resampler::Sample *)malloc(sizeof(Resampler::Sample) * imageX);
Resampler::Sample *buffGreen = (Resampler::Sample *)malloc(sizeof(Resampler::Sample) * imageX);
Resampler::Sample *buffBlue = (Resampler::Sample *)malloc(sizeof(Resampler::Sample) * imageX);
// And the downsampled image. Give a slight margin because the scaling routine above can give
// up to outWidth inclusive as an output value.
stbi_uc *outBuffer = (stbi_uc *)malloc(sizeof(stbi_uc) * 3 * (outWidth + 1) * (outHeight + 1));
// Set up the resamplers, reusing filter constants.
const char *pFilter = "blackman";
float filter_scale = 1.0;
Resampler resizeR(imageX, imageY, outWidth, outHeight, Resampler::BOUNDARY_CLAMP, 0.0f, 1.0f, pFilter, NULL, NULL, filter_scale, filter_scale);
Resampler resizeG(imageX, imageY, outWidth, outHeight, Resampler::BOUNDARY_CLAMP, 0.0f, 1.0f, pFilter, resizeR.get_clist_x(), resizeR.get_clist_y(), filter_scale, filter_scale);
Resampler resizeB(imageX, imageY, outWidth, outHeight, Resampler::BOUNDARY_CLAMP, 0.0f, 1.0f, pFilter, resizeR.get_clist_x(), resizeR.get_clist_y(), filter_scale, filter_scale);
int resultY = 0;
lmLog(gGFXTextureLogGroup, "Resample setup took %dms", t1 - platform_getMilliseconds());
int t2 = platform_getMilliseconds();
// Process each row of the image.
for (int y = 0; y < imageY; y++)
{
// Deinterleave each row.
for (int x = 0; x < imageX; x++)
{
buffRed[x] = Resampler::Sample(imageBits[(y * imageX * 4) + (x * 4) + 0]) / Resampler::Sample(255.f);
buffGreen[x] = Resampler::Sample(imageBits[(y * imageX * 4) + (x * 4) + 1]) / Resampler::Sample(255.f);
buffBlue[x] = Resampler::Sample(imageBits[(y * imageX * 4) + (x * 4) + 2]) / Resampler::Sample(255.f);
}
// Submit to resampler.
lmAssert(resizeR.put_line(buffRed), "bad red");
lmAssert(resizeG.put_line(buffGreen), "bad green");
lmAssert(resizeB.put_line(buffBlue), "bad blue");
// If there are results, reinterleave and consume them.
while (resizeR.check_line() && resizeG.check_line() && resizeB.check_line() && resultY < outHeight)
{
const Resampler::Sample *outRowR = resizeR.get_line();
const Resampler::Sample *outRowG = resizeG.get_line();
const Resampler::Sample *outRowB = resizeB.get_line();
if (outRowR || outRowG || outRowB)
{
lmAssert(outRowR && outRowG && outRowB, "Somehow got one line without others!");
}
else
{
break;
}
// Find the row for output.
stbi_uc *imageOutBits = outBuffer + (resultY * outWidth * 3);
resultY++;
for (int i = 0; i < outWidth; i++)
{
imageOutBits[i * 3 + 0] = int(outRowR[i] * Resampler::Sample(255.f));
imageOutBits[i * 3 + 1] = int(outRowG[i] * Resampler::Sample(255.f));
imageOutBits[i * 3 + 2] = int(outRowB[i] * Resampler::Sample(255.f));
}
// Every hundred lines post an update.
if (resultY % 100 == 0)
{
postResampleEvent(outPath, (float)resultY / (float)outHeight);
}
}
}
lmLog(gGFXTextureLogGroup, "Resample took %dms", t2 - platform_getMilliseconds());
// Write it back out.
int t3 = platform_getMilliseconds();
jpge::compress_image_to_jpeg_file(outPath, outWidth, outHeight, 3, outBuffer);
lmLog(gGFXTextureLogGroup, "JPEG output took %dms", t3 - platform_getMilliseconds());
// Post completion event.
postResampleEvent(outPath, 1.0);
// Free everything!
loom_asset_unlock(inPath);
free(buffRed);
free(buffGreen);
free(buffBlue);
free(outBuffer);
delete rn;
return 0;
}