/* Fill out buffer with the compressed format Ganesh expects from a colortable
based bitmap. [palette (colortable) + indices].
At the moment Ganesh only supports 8bit version. If Ganesh allowed we others
we could detect that the colortable.count is <= 16, and then repack the
indices as nibbles to save RAM, but it would take more time (i.e. a lot
slower than memcpy), so skipping that for now.
Ganesh wants a full 256 palette entry, even though Skia's ctable is only as big
as the colortable.count says it is.
*/
static void build_compressed_data(void* buffer, const SkBitmap& bitmap) {
SkASSERT(SkBitmap::kIndex8_Config == bitmap.config());
SkAutoLockPixels apl(bitmap);
if (!bitmap.readyToDraw()) {
SkASSERT(!"bitmap not ready to draw!");
return;
}
SkColorTable* ctable = bitmap.getColorTable();
char* dst = (char*)buffer;
memcpy(dst, ctable->lockColors(), ctable->count() * sizeof(SkPMColor));
ctable->unlockColors(false);
// always skip a full 256 number of entries, even if we memcpy'd fewer
dst += kGrColorTableSize;
if (bitmap.width() == bitmap.rowBytes()) {
memcpy(dst, bitmap.getPixels(), bitmap.getSize());
} else {
// need to trim off the extra bytes per row
size_t width = bitmap.width();
size_t rowBytes = bitmap.rowBytes();
const char* src = (const char*)bitmap.getPixels();
for (int y = 0; y < bitmap.height(); y++) {
memcpy(dst, src, width);
src += rowBytes;
dst += width;
}
}
}
static void convertToIndex666(const SkBitmap& src, SkBitmap* dst) {
SkColorTable* ctable = new SkColorTable(216);
SkPMColor* colors = ctable->lockColors();
// rrr ggg bbb
for (int r = 0; r < 6; r++) {
int rr = conv6ToByte(r);
for (int g = 0; g < 6; g++) {
int gg = conv6ToByte(g);
for (int b = 0; b < 6; b++) {
int bb = conv6ToByte(b);
*colors++ = SkPreMultiplyARGB(0xFF, rr, gg, bb);
}
}
}
ctable->unlockColors(true);
dst->setConfig(SkBitmap::kIndex8_Config, src.width(), src.height());
dst->allocPixels(ctable);
ctable->unref();
SkAutoLockPixels alps(src);
SkAutoLockPixels alpd(*dst);
for (int y = 0; y < src.height(); y++) {
const SkPMColor* srcP = src.getAddr32(0, y);
uint8_t* dstP = dst->getAddr8(0, y);
for (int x = src.width() - 1; x >= 0; --x) {
*dstP++ = compute666Index(*srcP++);
}
}
}
static SkBitmap make_bitmap() {
SkBitmap bm;
SkColorTable* ctable = new SkColorTable(256);
SkPMColor* c = ctable->lockColors();
for (int i = 0; i < 256; i++) {
c[i] = SkPackARGB32(255 - i, 0, 0, 0);
}
ctable->unlockColors(true);
bm.setConfig(SkBitmap::kIndex8_Config, 256, 256);
bm.allocPixels(ctable);
ctable->unref();
bm.lockPixels();
const float cx = bm.width() * 0.5f;
const float cy = bm.height() * 0.5f;
for (int y = 0; y < bm.height(); y++) {
float dy = y - cy;
dy *= dy;
uint8_t* p = bm.getAddr8(0, y);
for (int x = 0; x < 256; x++) {
float dx = x - cx;
dx *= dx;
float d = (dx + dy) / (cx/2);
int id = (int)d;
if (id > 255) {
id = 255;
}
p[x] = id;
}
}
bm.unlockPixels();
return bm;
}
static SkBitmap make_bitmap()
{
SkBitmap bm;
SkColorTable* ctable = new SkColorTable(256);
SkPMColor* c = ctable->lockColors();
for (int i = 0; i < 256; i++)
{
c[i] = SkPackARGB32(0xFF, i, 0, 0);
}
ctable->unlockColors(true);
bm.setConfig(SkBitmap::kIndex8_Config, 256, 32);
bm.allocPixels(ctable);
ctable->unref();
bm.lockPixels();
for (int y = 0; y < bm.height(); y++)
{
uint8_t* p = bm.getAddr8(0, y);
for (int x = 0; x < 256; x++)
{
p[x] = x;
}
}
bm.unlockPixels();
return bm;
}
static jboolean Bitmap_writeToParcel(JNIEnv* env, jobject,
jlong bitmapHandle,
jboolean isMutable, jint density,
jobject parcel) {
const SkBitmap* bitmap = reinterpret_cast<SkBitmap*>(bitmapHandle);
if (parcel == NULL) {
SkDebugf("------- writeToParcel null parcel\n");
return JNI_FALSE;
}
android::Parcel* p = android::parcelForJavaObject(env, parcel);
p->writeInt32(isMutable);
p->writeInt32(bitmap->colorType());
p->writeInt32(bitmap->alphaType());
p->writeInt32(bitmap->width());
p->writeInt32(bitmap->height());
p->writeInt32(bitmap->rowBytes());
p->writeInt32(density);
if (bitmap->colorType() == kIndex_8_SkColorType) {
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();
} else {
p->writeInt32(0); // indicate no ctable
}
}
size_t size = bitmap->getSize();
android::Parcel::WritableBlob blob;
android::status_t status = p->writeBlob(size, &blob);
if (status) {
doThrowRE(env, "Could not write bitmap to parcel blob.");
return JNI_FALSE;
}
bitmap->lockPixels();
const void* pSrc = bitmap->getPixels();
if (pSrc == NULL) {
memset(blob.data(), 0, size);
} else {
memcpy(blob.data(), pSrc, size);
}
bitmap->unlockPixels();
blob.release();
return JNI_TRUE;
}
/* Fill out buffer with the compressed format GL expects from a colortable
based bitmap. [palette (colortable) + indices].
At the moment I always take the 8bit version, since that's what my data
is. I could detect that the colortable.count is <= 16, and then repack the
indices as nibbles to save RAM, but it would take more time (i.e. a lot
slower than memcpy), so I'm skipping that for now.
GL wants a full 256 palette entry, even though my ctable is only as big
as the colortable.count says it is. I presume it is OK to leave any
trailing entries uninitialized, since none of my indices should exceed
ctable->count().
*/
static void build_compressed_data(void* buffer, const SkBitmap& bitmap) {
SkASSERT(SkBitmap::kIndex8_Config == bitmap.config());
SkColorTable* ctable = bitmap.getColorTable();
uint8_t* dst = (uint8_t*)buffer;
memcpy(dst, ctable->lockColors(), ctable->count() * sizeof(SkPMColor));
ctable->unlockColors(false);
// always skip a full 256 number of entries, even if we memcpy'd fewer
dst += SK_GL_SIZE_OF_PALETTE;
memcpy(dst, bitmap.getPixels(), bitmap.getSize());
}
/* Fill out buffer with the compressed format Ganesh expects from a colortable
based bitmap. [palette (colortable) + indices].
At the moment Ganesh only supports 8bit version. If Ganesh allowed we others
we could detect that the colortable.count is <= 16, and then repack the
indices as nibbles to save RAM, but it would take more time (i.e. a lot
slower than memcpy), so skipping that for now.
Ganesh wants a full 256 palette entry, even though Skia's ctable is only as big
as the colortable.count says it is.
*/
static void build_compressed_data(void* buffer, const SkBitmap& bitmap) {
SkASSERT(SkBitmap::kIndex8_Config == bitmap.config());
SkAutoLockPixels alp(bitmap);
if (!bitmap.readyToDraw()) {
SkDEBUGFAIL("bitmap not ready to draw!");
return;
}
SkColorTable* ctable = bitmap.getColorTable();
char* dst = (char*)buffer;
const int count = ctable->count();
SkDstPixelInfo dstPI;
dstPI.fColorType = kRGBA_8888_SkColorType;
dstPI.fAlphaType = kPremul_SkAlphaType;
dstPI.fPixels = buffer;
dstPI.fRowBytes = count * sizeof(SkPMColor);
SkSrcPixelInfo srcPI;
srcPI.fColorType = kPMColor_SkColorType;
srcPI.fAlphaType = kPremul_SkAlphaType;
srcPI.fPixels = ctable->lockColors();
srcPI.fRowBytes = count * sizeof(SkPMColor);
srcPI.convertPixelsTo(&dstPI, count, 1);
ctable->unlockColors();
// always skip a full 256 number of entries, even if we memcpy'd fewer
dst += kGrColorTableSize;
if ((unsigned)bitmap.width() == bitmap.rowBytes()) {
memcpy(dst, bitmap.getPixels(), bitmap.getSize());
} else {
// need to trim off the extra bytes per row
size_t width = bitmap.width();
size_t rowBytes = bitmap.rowBytes();
const char* src = (const char*)bitmap.getPixels();
for (int y = 0; y < bitmap.height(); y++) {
memcpy(dst, src, width);
src += rowBytes;
dst += width;
}
}
}
static SkBitmap make_bitmap() {
SkBitmap bm;
SkColorTable* ctable = new SkColorTable(1);
SkPMColor* c = ctable->lockColors();
c[0] = SkPackARGB32(0x80, 0x80, 0, 0);
ctable->unlockColors(true);
bm.setConfig(SkBitmap::kIndex8_Config, 1, 1);
bm.allocPixels(ctable);
ctable->unref();
bm.lockPixels();
*bm.getAddr8(0, 0) = 0;
bm.unlockPixels();
return bm;
}
static SkBitmap make_bitmap() {
SkBitmap bm;
const int N = 1;
SkColorTable* ctable = new SkColorTable(N);
SkPMColor* c = ctable->lockColors();
for (int i = 0; i < N; i++) {
c[i] = SkPackARGB32(0x80, 0x80, 0, 0);
}
ctable->unlockColors(true);
bm.setConfig(SkBitmap::kIndex8_Config, 1, 1);
bm.allocPixels(ctable);
ctable->unref();
bm.lockPixels();
for (int y = 0; y < bm.height(); y++) {
uint8_t* p = bm.getAddr8(0, y);
for (int x = 0; x < bm.width(); x++) {
p[x] = 0;
}
}
bm.unlockPixels();
return bm;
}
/* Fill out buffer with the compressed format Ganesh expects from a colortable
based bitmap. [palette (colortable) + indices].
At the moment Ganesh only supports 8bit version. If Ganesh allowed we others
we could detect that the colortable.count is <= 16, and then repack the
indices as nibbles to save RAM, but it would take more time (i.e. a lot
slower than memcpy), so skipping that for now.
Ganesh wants a full 256 palette entry, even though Skia's ctable is only as big
as the colortable.count says it is.
*/
static void build_compressed_data(void* buffer, const SkBitmap& bitmap) {
SkASSERT(SkBitmap::kIndex8_Config == bitmap.config());
SkAutoLockPixels alp(bitmap);
if (!bitmap.readyToDraw()) {
SkDEBUGFAIL("bitmap not ready to draw!");
return;
}
SkColorTable* ctable = bitmap.getColorTable();
char* dst = (char*)buffer;
uint32_t* colorTableDst = reinterpret_cast<uint32_t*>(dst);
const uint32_t* colorTableSrc = reinterpret_cast<const uint32_t*>(ctable->lockColors());
SkConvertConfig8888Pixels(colorTableDst, 0, SkCanvas::kRGBA_Premul_Config8888,
colorTableSrc, 0, SkCanvas::kNative_Premul_Config8888,
ctable->count(), 1);
ctable->unlockColors();
// always skip a full 256 number of entries, even if we memcpy'd fewer
dst += kGrColorTableSize;
if ((unsigned)bitmap.width() == bitmap.rowBytes()) {
memcpy(dst, bitmap.getPixels(), bitmap.getSize());
} else {
// need to trim off the extra bytes per row
size_t width = bitmap.width();
size_t rowBytes = bitmap.rowBytes();
const char* src = (const char*)bitmap.getPixels();
for (int y = 0; y < bitmap.height(); y++) {
memcpy(dst, src, width);
src += rowBytes;
dst += width;
}
}
}
bool SkPNGImageDecoder::onDecode(SkStream* sk_stream, SkBitmap* decodedBitmap,
SkBitmap::Config prefConfig, Mode mode) {
// SkAutoTrace apr("SkPNGImageDecoder::onDecode");
/* Create and initialize the png_struct with the desired error handler
* functions. If you want to use the default stderr and longjump method,
* you can supply NULL for the last three parameters. We also supply the
* the compiler header file version, so that we know if the application
* was compiled with a compatible version of the library. */
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
NULL, sk_error_fn, NULL);
// png_voidp user_error_ptr, user_error_fn, user_warning_fn);
if (png_ptr == NULL) {
return false;
}
/* Allocate/initialize the memory for image information. */
png_infop info_ptr = png_create_info_struct(png_ptr);
if (info_ptr == NULL) {
png_destroy_read_struct(&png_ptr, png_infopp_NULL, png_infopp_NULL);
return false;
}
PNGAutoClean autoClean(png_ptr, info_ptr);
/* Set error handling if you are using the setjmp/longjmp method (this is
* the normal method of doing things with libpng). REQUIRED unless you
* set up your own error handlers in the png_create_read_struct() earlier.
*/
if (setjmp(png_jmpbuf(png_ptr))) {
return false;
}
/* If you are using replacement read functions, instead of calling
* png_init_io() here you would call:
*/
png_set_read_fn(png_ptr, (void *)sk_stream, sk_read_fn);
/* where user_io_ptr is a structure you want available to the callbacks */
/* If we have already read some of the signature */
// png_set_sig_bytes(png_ptr, 0 /* sig_read */ );
// hookup our peeker so we can see any user-chunks the caller may be interested in
png_set_keep_unknown_chunks(png_ptr, PNG_HANDLE_CHUNK_ALWAYS, (png_byte*)"", 0);
if (this->getPeeker()) {
png_set_read_user_chunk_fn(png_ptr, (png_voidp)this->getPeeker(), sk_read_user_chunk);
}
/* The call to png_read_info() gives us all of the information from the
* PNG file before the first IDAT (image data chunk). */
png_read_info(png_ptr, info_ptr);
png_uint_32 origWidth, origHeight;
int bit_depth, color_type, interlace_type;
png_get_IHDR(png_ptr, info_ptr, &origWidth, &origHeight, &bit_depth, &color_type,
&interlace_type, int_p_NULL, int_p_NULL);
SkBitmap::Config config;
bool hasAlpha = false;
bool doDither = this->getDitherImage();
// check for sBIT chunk data, in case we should disable dithering because
// our data is not truely 8bits per component
if (doDither) {
#if 0
SkDebugf("----- sBIT %d %d %d %d\n", info_ptr->sig_bit.red,
info_ptr->sig_bit.green, info_ptr->sig_bit.blue,
info_ptr->sig_bit.alpha);
#endif
// 0 seems to indicate no information available
if (pos_le(info_ptr->sig_bit.red, SK_R16_BITS) &&
pos_le(info_ptr->sig_bit.green, SK_G16_BITS) &&
pos_le(info_ptr->sig_bit.blue, SK_B16_BITS)) {
doDither = false;
}
}
if (color_type == PNG_COLOR_TYPE_PALETTE) {
config = SkBitmap::kIndex8_Config; // defer sniffing for hasAlpha
} else {
png_color_16p transColor;
png_get_tRNS(png_ptr, info_ptr, NULL, NULL, &transColor);
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS) ||
PNG_COLOR_TYPE_RGB_ALPHA == color_type ||
PNG_COLOR_TYPE_GRAY_ALPHA == color_type) {
hasAlpha = true;
config = SkBitmap::kARGB_8888_Config;
} else { // we get to choose the config
config = prefConfig;
if (config == SkBitmap::kNo_Config) {
config = SkImageDecoder::GetDeviceConfig();
}
if (config != SkBitmap::kRGB_565_Config &&
config != SkBitmap::kARGB_4444_Config) {
config = SkBitmap::kARGB_8888_Config;
}
}
}
if (!this->chooseFromOneChoice(config, origWidth, origHeight)) {
return false;
}
const int sampleSize = this->getSampleSize();
SkScaledBitmapSampler sampler(origWidth, origHeight, sampleSize);
decodedBitmap->setConfig(config, sampler.scaledWidth(),
sampler.scaledHeight(), 0);
if (SkImageDecoder::kDecodeBounds_Mode == mode) {
return true;
}
// from here down we are concerned with colortables and pixels
/* tell libpng to strip 16 bit/color files down to 8 bits/color */
if (bit_depth == 16) {
png_set_strip_16(png_ptr);
}
/* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
* byte into separate bytes (useful for paletted and grayscale images). */
if (bit_depth < 8) {
png_set_packing(png_ptr);
}
/* Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {
png_set_gray_1_2_4_to_8(png_ptr);
}
/* Make a grayscale image into RGB. */
if (color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
png_set_gray_to_rgb(png_ptr);
}
// we track if we actually see a non-opaque pixels, since sometimes a PNG sets its colortype
// to |= PNG_COLOR_MASK_ALPHA, but all of its pixels are in fact opaque. We care, since we
// draw lots faster if we can flag the bitmap has being opaque
bool reallyHasAlpha = false;
SkColorTable* colorTable = NULL;
if (color_type == PNG_COLOR_TYPE_PALETTE) {
int num_palette;
png_colorp palette;
png_bytep trans;
int num_trans;
png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette);
/* BUGGY IMAGE WORKAROUND
We hit some images (e.g. fruit_.png) who contain bytes that are == colortable_count
which is a problem since we use the byte as an index. To work around this we grow
the colortable by 1 (if its < 256) and duplicate the last color into that slot.
*/
int colorCount = num_palette + (num_palette < 256);
colorTable = SkNEW_ARGS(SkColorTable, (colorCount));
SkPMColor* colorPtr = colorTable->lockColors();
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
png_get_tRNS(png_ptr, info_ptr, &trans, &num_trans, NULL);
hasAlpha = (num_trans > 0);
} else {
num_trans = 0;
colorTable->setFlags(colorTable->getFlags() | SkColorTable::kColorsAreOpaque_Flag);
}
// check for bad images that might make us crash
if (num_trans > num_palette) {
num_trans = num_palette;
}
int index = 0;
int transLessThanFF = 0;
for (; index < num_trans; index++) {
transLessThanFF |= (int)*trans - 0xFF;
*colorPtr++ = SkPreMultiplyARGB(*trans++, palette->red, palette->green, palette->blue);
palette++;
}
reallyHasAlpha |= (transLessThanFF < 0);
for (; index < num_palette; index++) {
*colorPtr++ = SkPackARGB32(0xFF, palette->red, palette->green, palette->blue);
palette++;
}
// see BUGGY IMAGE WORKAROUND comment above
if (num_palette < 256) {
*colorPtr = colorPtr[-1];
}
colorTable->unlockColors(true);
}
SkAutoUnref aur(colorTable);
if (!this->allocPixelRef(decodedBitmap, colorTable)) {
delete colorTable;
return false;
}
SkAutoLockPixels alp(*decodedBitmap);
/* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
// if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
// ; // png_set_swap_alpha(png_ptr);
/* swap bytes of 16 bit files to least significant byte first */
// png_set_swap(png_ptr);
/* Add filler (or alpha) byte (before/after each RGB triplet) */
if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_GRAY) {
png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
}
/* Turn on interlace handling. REQUIRED if you are not using
* png_read_image(). To see how to handle interlacing passes,
* see the png_read_row() method below:
*/
const int number_passes = interlace_type != PNG_INTERLACE_NONE ?
png_set_interlace_handling(png_ptr) : 1;
/* Optional call to gamma correct and add the background to the palette
* and update info structure. REQUIRED if you are expecting libpng to
* update the palette for you (ie you selected such a transform above).
*/
png_read_update_info(png_ptr, info_ptr);
if (SkBitmap::kIndex8_Config == config && 1 == sampleSize) {
for (int i = 0; i < number_passes; i++) {
for (png_uint_32 y = 0; y < origHeight; y++) {
uint8_t* bmRow = decodedBitmap->getAddr8(0, y);
png_read_rows(png_ptr, &bmRow, png_bytepp_NULL, 1);
}
}
} else {
SkScaledBitmapSampler::SrcConfig sc;
int srcBytesPerPixel = 4;
if (SkBitmap::kIndex8_Config == config) {
sc = SkScaledBitmapSampler::kIndex;
srcBytesPerPixel = 1;
} else if (hasAlpha) {
sc = SkScaledBitmapSampler::kRGBA;
} else {
sc = SkScaledBitmapSampler::kRGBX;
}
SkAutoMalloc storage(origWidth * srcBytesPerPixel);
const int height = decodedBitmap->height();
for (int i = 0; i < number_passes; i++) {
if (!sampler.begin(decodedBitmap, sc, doDither)) {
return false;
}
uint8_t* srcRow = (uint8_t*)storage.get();
skip_src_rows(png_ptr, srcRow, sampler.srcY0());
for (int y = 0; y < height; y++) {
uint8_t* tmp = srcRow;
png_read_rows(png_ptr, &tmp, png_bytepp_NULL, 1);
reallyHasAlpha |= sampler.next(srcRow);
if (y < height - 1) {
skip_src_rows(png_ptr, srcRow, sampler.srcDY() - 1);
}
}
// skip the rest of the rows (if any)
png_uint_32 read = (height - 1) * sampler.srcDY() +
sampler.srcY0() + 1;
SkASSERT(read <= origHeight);
skip_src_rows(png_ptr, srcRow, origHeight - read);
}
if (hasAlpha && !reallyHasAlpha) {
SkDEBUGF(("Image doesn't really have alpha [%d %d]\n",
origWidth, origHeight));
}
}
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end(png_ptr, info_ptr);
decodedBitmap->setIsOpaque(!reallyHasAlpha);
return true;
}
