Also, the Bitmap class internally (in the C++ JNI atleast) supports the all familiar lockPixels and unlockPixels methods, which allows direct access to the byte buffer. I would suggest extending the Java API to include those methods.
On Dec 2, 1:00 am, Koush <[EMAIL PROTECTED]> wrote: > Dianne Hackborn: I am asking this in the context of how to create a > screenshot application. Taking screenshots is not possible on the G1 > anyways, because reading from /dev/graphics/fb0 is only available to > root and shell and not available to actual applications. Thus is only > works on hacked phones. So you're asking me to not do something, when > I'm well past the line of things I should not be doing. :) > Incidentally, the inability to take a simple screenshot of what is on > your phone is a pretty significant oversight (you're not going to > always be hooked up to a PC with the SDK/DDMS tool at your disposal). > > John Spurlock: Decode byte array is for compressed byte arrays, such > as PNGs and JPG. > I am basically trying to copy directly into the pixel buffer. > > On Dec 1, 3:34 pm, John Spurlock <[EMAIL PROTECTED]> wrote: > > > BitmapFactory.decodeByteArray ? > > >http://code.google.com/android/reference/android/graphics/BitmapFacto... > > > On Dec 1, 5:58 pm, Koush <[EMAIL PROTECTED]> wrote: > > > > I inspected Bitmap.cpp and found this function: > > > > static jboolean Bitmap_writeToParcel(JNIEnv* env, jobject, > > > const SkBitmap* bitmap, > > > jboolean isMutable, jobject > > > parcel) { > > > if (parcel == NULL) { > > > SkDebugf("------- writeToParcel null parcel\n"); > > > return false; > > > } > > > > android::Parcel* p = android::parcelForJavaObject(env, parcel); > > > > p->writeInt32(isMutable); > > > p->writeInt32(bitmap->config()); > > > p->writeInt32(bitmap->width()); > > > p->writeInt32(bitmap->height()); > > > p->writeInt32(bitmap->rowBytes()); > > > > if (bitmap->getConfig() == SkBitmap::kIndex8_Config) { > > > SkColorTable* ctable = bitmap->getColorTable(); > > > if (ctable != NULL) { > > > int count = ctable->count(); > > > p->writeInt32(count); > > > memcpy(p->writeInplace(count * sizeof(SkPMColor)), > > > ctable->lockColors(), count * sizeof(SkPMColor)); > > > ctable->unlockColors(false); > > > } else { > > > p->writeInt32(0); // indicate no ctable > > > } > > > } > > > > size_t size = bitmap->getSize(); > > > bitmap->lockPixels(); > > > memcpy(p->writeInplace(size), bitmap->getPixels(), size); > > > bitmap->unlockPixels(); > > > return true; > > > > } > > > > I can manually marshal a Bitmap parcel in the proper format, and then > > > append the custom byte buffer, and then use createFromParcel to create > > > a bitmap. That gets me indirect access to creating a bitmap directly > > > from a byte buffer. It's a bit of a hack obviously, and not ideal. Is > > > there a better way to do this? > > > > On Dec 1, 2:41 pm, Koush <[EMAIL PROTECTED]> wrote: > > > > > I'm trying to populate a create a bitmap from something other than an > > > > RGBA int array. > > > > However, the Bitmap creation overloads only take int arrays as inputs. > > > > > In particular, I have a byte buffer that is in the R5G6B5 format that > > > > I want to load directly into a bitmap. The format is supposedly > > > > supported internally, but I can't figure out how to create the bitmap > > > > without doing the R5G6B5 to A8R8G8B8 conversion first. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
