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gecko-dev/gfx/thebes/gfxASurface.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Foundation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Stuart Parmenter <stuart@mozilla.com>
* Vladimir Vukicevic <vladimir@pobox.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "nsIMemoryReporter.h"
#include "nsMemory.h"
#include "CheckedInt.h"
#include "gfxASurface.h"
#include "gfxContext.h"
#include "gfxImageSurface.h"
#include "nsRect.h"
#include "cairo.h"
#ifdef CAIRO_HAS_WIN32_SURFACE
#include "gfxWindowsSurface.h"
#endif
#ifdef CAIRO_HAS_D2D_SURFACE
#include "gfxD2DSurface.h"
#endif
#ifdef MOZ_X11
#include "gfxXlibSurface.h"
#endif
#ifdef CAIRO_HAS_QUARTZ_SURFACE
#include "gfxQuartzSurface.h"
#include "gfxQuartzImageSurface.h"
#endif
#ifdef MOZ_DFB
#include "gfxDirectFBSurface.h"
#endif
#if defined(CAIRO_HAS_QT_SURFACE) && defined(MOZ_WIDGET_QT)
#include "gfxQPainterSurface.h"
#endif
#include <stdio.h>
#include <limits.h>
#include "imgIEncoder.h"
#include "nsComponentManagerUtils.h"
#include "gfxContext.h"
#include "prmem.h"
#include "nsISupportsUtils.h"
#include "plbase64.h"
#include "nsCOMPtr.h"
#include "nsIConsoleService.h"
#include "nsServiceManagerUtils.h"
#include "nsStringGlue.h"
using mozilla::CheckedInt;
static cairo_user_data_key_t gfxasurface_pointer_key;
// Surfaces use refcounting that's tied to the cairo surface refcnt, to avoid
// refcount mismatch issues.
nsrefcnt
gfxASurface::AddRef(void)
{
if (mSurfaceValid) {
if (mFloatingRefs) {
// eat a floating ref
mFloatingRefs--;
} else {
cairo_surface_reference(mSurface);
}
return (nsrefcnt) cairo_surface_get_reference_count(mSurface);
} else {
// the surface isn't valid, but we still need to refcount
// the gfxASurface
return ++mFloatingRefs;
}
}
nsrefcnt
gfxASurface::Release(void)
{
if (mSurfaceValid) {
NS_ASSERTION(mFloatingRefs == 0, "gfxASurface::Release with floating refs still hanging around!");
// Note that there is a destructor set on user data for mSurface,
// which will delete this gfxASurface wrapper when the surface's refcount goes
// out of scope.
nsrefcnt refcnt = (nsrefcnt) cairo_surface_get_reference_count(mSurface);
cairo_surface_destroy(mSurface);
// |this| may not be valid any more, don't use it!
return --refcnt;
} else {
if (--mFloatingRefs == 0) {
delete this;
return 0;
}
return mFloatingRefs;
}
}
void
gfxASurface::SurfaceDestroyFunc(void *data) {
gfxASurface *surf = (gfxASurface*) data;
// fprintf (stderr, "Deleting wrapper for %p (wrapper: %p)\n", surf->mSurface, data);
delete surf;
}
gfxASurface*
gfxASurface::GetSurfaceWrapper(cairo_surface_t *csurf)
{
if (!csurf)
return NULL;
return (gfxASurface*) cairo_surface_get_user_data(csurf, &gfxasurface_pointer_key);
}
void
gfxASurface::SetSurfaceWrapper(cairo_surface_t *csurf, gfxASurface *asurf)
{
if (!csurf)
return;
cairo_surface_set_user_data(csurf, &gfxasurface_pointer_key, asurf, SurfaceDestroyFunc);
}
already_AddRefed<gfxASurface>
gfxASurface::Wrap (cairo_surface_t *csurf)
{
gfxASurface *result;
/* Do we already have a wrapper for this surface? */
result = GetSurfaceWrapper(csurf);
if (result) {
// fprintf(stderr, "Existing wrapper for %p -> %p\n", csurf, result);
NS_ADDREF(result);
return result;
}
/* No wrapper; figure out the surface type and create it */
cairo_surface_type_t stype = cairo_surface_get_type(csurf);
if (stype == CAIRO_SURFACE_TYPE_IMAGE) {
result = new gfxImageSurface(csurf);
}
#ifdef CAIRO_HAS_WIN32_SURFACE
else if (stype == CAIRO_SURFACE_TYPE_WIN32 ||
stype == CAIRO_SURFACE_TYPE_WIN32_PRINTING) {
result = new gfxWindowsSurface(csurf);
}
#endif
#ifdef CAIRO_HAS_D2D_SURFACE
else if (stype == CAIRO_SURFACE_TYPE_D2D) {
result = new gfxD2DSurface(csurf);
}
#endif
#ifdef MOZ_X11
else if (stype == CAIRO_SURFACE_TYPE_XLIB) {
result = new gfxXlibSurface(csurf);
}
#endif
#ifdef CAIRO_HAS_QUARTZ_SURFACE
else if (stype == CAIRO_SURFACE_TYPE_QUARTZ) {
result = new gfxQuartzSurface(csurf);
}
else if (stype == CAIRO_SURFACE_TYPE_QUARTZ_IMAGE) {
result = new gfxQuartzImageSurface(csurf);
}
#endif
#ifdef MOZ_DFB
else if (stype == CAIRO_SURFACE_TYPE_DIRECTFB) {
result = new gfxDirectFBSurface(csurf);
}
#endif
#if defined(CAIRO_HAS_QT_SURFACE) && defined(MOZ_WIDGET_QT)
else if (stype == CAIRO_SURFACE_TYPE_QT) {
result = new gfxQPainterSurface(csurf);
}
#endif
else {
result = new gfxUnknownSurface(csurf);
}
// fprintf(stderr, "New wrapper for %p -> %p\n", csurf, result);
NS_ADDREF(result);
return result;
}
void
gfxASurface::Init(cairo_surface_t* surface, PRBool existingSurface)
{
if (cairo_surface_status(surface)) {
// the surface has an error on it
mSurfaceValid = PR_FALSE;
cairo_surface_destroy(surface);
return;
}
SetSurfaceWrapper(surface, this);
mSurface = surface;
mSurfaceValid = PR_TRUE;
if (existingSurface) {
mFloatingRefs = 0;
} else {
mFloatingRefs = 1;
#ifdef MOZ_TREE_CAIRO
if (cairo_surface_get_content(surface) != CAIRO_CONTENT_COLOR) {
cairo_surface_set_subpixel_antialiasing(surface, CAIRO_SUBPIXEL_ANTIALIASING_DISABLED);
}
#endif
}
}
gfxASurface::gfxSurfaceType
gfxASurface::GetType() const
{
if (!mSurfaceValid)
return (gfxSurfaceType)-1;
return (gfxSurfaceType)cairo_surface_get_type(mSurface);
}
gfxASurface::gfxContentType
gfxASurface::GetContentType() const
{
if (!mSurfaceValid)
return (gfxContentType)-1;
return (gfxContentType)cairo_surface_get_content(mSurface);
}
void
gfxASurface::SetDeviceOffset(const gfxPoint& offset)
{
if (!mSurfaceValid)
return;
cairo_surface_set_device_offset(mSurface,
offset.x, offset.y);
}
gfxPoint
gfxASurface::GetDeviceOffset() const
{
if (!mSurfaceValid)
return gfxPoint(0.0, 0.0);
gfxPoint pt;
cairo_surface_get_device_offset(mSurface, &pt.x, &pt.y);
return pt;
}
void
gfxASurface::Flush() const
{
if (!mSurfaceValid)
return;
cairo_surface_flush(mSurface);
}
void
gfxASurface::MarkDirty()
{
if (!mSurfaceValid)
return;
cairo_surface_mark_dirty(mSurface);
}
void
gfxASurface::MarkDirty(const gfxRect& r)
{
if (!mSurfaceValid)
return;
cairo_surface_mark_dirty_rectangle(mSurface,
(int) r.X(), (int) r.Y(),
(int) r.Width(), (int) r.Height());
}
void
gfxASurface::SetData(const cairo_user_data_key_t *key,
void *user_data,
thebes_destroy_func_t destroy)
{
if (!mSurfaceValid)
return;
cairo_surface_set_user_data(mSurface, key, user_data, destroy);
}
void *
gfxASurface::GetData(const cairo_user_data_key_t *key)
{
if (!mSurfaceValid)
return NULL;
return cairo_surface_get_user_data(mSurface, key);
}
void
gfxASurface::Finish()
{
// null surfaces are allowed here
cairo_surface_finish(mSurface);
}
already_AddRefed<gfxASurface>
gfxASurface::CreateSimilarSurface(gfxContentType aContent,
const gfxIntSize& aSize)
{
if (!mSurface || !mSurfaceValid) {
return nsnull;
}
cairo_surface_t *surface =
cairo_surface_create_similar(mSurface, cairo_content_t(aContent),
aSize.width, aSize.height);
if (cairo_surface_status(surface)) {
cairo_surface_destroy(surface);
return nsnull;
}
nsRefPtr<gfxASurface> result = Wrap(surface);
cairo_surface_destroy(surface);
return result.forget();
}
int
gfxASurface::CairoStatus()
{
if (!mSurfaceValid)
return -1;
return cairo_surface_status(mSurface);
}
/* static */
PRBool
gfxASurface::CheckSurfaceSize(const gfxIntSize& sz, PRInt32 limit)
{
if (sz.width < 0 || sz.height < 0) {
NS_WARNING("Surface width or height < 0!");
return PR_FALSE;
}
// reject images with sides bigger than limit
if (limit && (sz.width > limit || sz.height > limit)) {
NS_WARNING("Surface size too large (exceeds caller's limit)!");
return PR_FALSE;
}
#if defined(XP_MACOSX)
// CoreGraphics is limited to images < 32K in *height*,
// so clamp all surfaces on the Mac to that height
if (sz.height > SHRT_MAX) {
NS_WARNING("Surface size too large (exceeds CoreGraphics limit)!");
return PR_FALSE;
}
#endif
// make sure the surface area doesn't overflow a PRInt32
CheckedInt<PRInt32> tmp = sz.width;
tmp *= sz.height;
if (!tmp.valid()) {
NS_WARNING("Surface size too large (would overflow)!");
return PR_FALSE;
}
// assuming 4-byte stride, make sure the allocation size
// doesn't overflow a PRInt32 either
tmp *= 4;
if (!tmp.valid()) {
NS_WARNING("Allocation too large (would overflow)!");
return PR_FALSE;
}
return PR_TRUE;
}
/* static */
PRInt32
gfxASurface::FormatStrideForWidth(gfxImageFormat format, PRInt32 width)
{
return cairo_format_stride_for_width((cairo_format_t)format, (int)width);
}
nsresult
gfxASurface::BeginPrinting(const nsAString& aTitle, const nsAString& aPrintToFileName)
{
return NS_OK;
}
nsresult
gfxASurface::EndPrinting()
{
return NS_OK;
}
nsresult
gfxASurface::AbortPrinting()
{
return NS_OK;
}
nsresult
gfxASurface::BeginPage()
{
return NS_OK;
}
nsresult
gfxASurface::EndPage()
{
return NS_OK;
}
gfxASurface::gfxContentType
gfxASurface::ContentFromFormat(gfxImageFormat format)
{
switch (format) {
case ImageFormatARGB32:
return CONTENT_COLOR_ALPHA;
case ImageFormatRGB24:
case ImageFormatRGB16_565:
return CONTENT_COLOR;
case ImageFormatA8:
case ImageFormatA1:
return CONTENT_ALPHA;
case ImageFormatUnknown:
default:
return CONTENT_COLOR;
}
}
gfxASurface::gfxImageFormat
gfxASurface::FormatFromContent(gfxASurface::gfxContentType type)
{
switch (type) {
case CONTENT_COLOR_ALPHA:
return ImageFormatARGB32;
case CONTENT_ALPHA:
return ImageFormatA8;
case CONTENT_COLOR:
default:
return ImageFormatRGB24;
}
}
void
gfxASurface::SetSubpixelAntialiasingEnabled(PRBool aEnabled)
{
#ifdef MOZ_TREE_CAIRO
if (!mSurfaceValid)
return;
cairo_surface_set_subpixel_antialiasing(mSurface,
aEnabled ? CAIRO_SUBPIXEL_ANTIALIASING_ENABLED : CAIRO_SUBPIXEL_ANTIALIASING_DISABLED);
#endif
}
PRBool
gfxASurface::GetSubpixelAntialiasingEnabled()
{
if (!mSurfaceValid)
return PR_FALSE;
#ifdef MOZ_TREE_CAIRO
return cairo_surface_get_subpixel_antialiasing(mSurface) == CAIRO_SUBPIXEL_ANTIALIASING_ENABLED;
#else
return PR_TRUE;
#endif
}
gfxASurface::MemoryLocation
gfxASurface::GetMemoryLocation() const
{
return MEMORY_IN_PROCESS_HEAP;
}
PRInt32
gfxASurface::BytePerPixelFromFormat(gfxImageFormat format)
{
switch (format) {
case ImageFormatARGB32:
case ImageFormatRGB24:
return 4;
case ImageFormatRGB16_565:
return 2;
case ImageFormatA8:
return 1;
default:
NS_WARNING("Unknown byte per pixel value for Image format");
}
return 0;
}
void
gfxASurface::FastMovePixels(const nsIntRect& aSourceRect,
const nsIntPoint& aDestTopLeft)
{
// Used when the backend can internally handle self copies.
nsIntRect dest(aDestTopLeft, aSourceRect.Size());
nsRefPtr<gfxContext> ctx = new gfxContext(this);
ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
nsIntPoint srcOrigin = dest.TopLeft() - aSourceRect.TopLeft();
ctx->SetSource(this, gfxPoint(srcOrigin.x, srcOrigin.y));
ctx->Rectangle(gfxRect(dest.x, dest.y, dest.width, dest.height));
ctx->Fill();
}
void
gfxASurface::MovePixels(const nsIntRect& aSourceRect,
const nsIntPoint& aDestTopLeft)
{
// Assume the backend can't handle self copying well and allocate
// a temporary surface instead.
nsRefPtr<gfxASurface> tmp =
CreateSimilarSurface(GetContentType(),
gfxIntSize(aSourceRect.width, aSourceRect.height));
nsRefPtr<gfxContext> ctx = new gfxContext(tmp);
ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
ctx->SetSource(this, gfxPoint(-aSourceRect.x, -aSourceRect.y));
ctx->Paint();
ctx = new gfxContext(this);
ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
ctx->SetSource(tmp, gfxPoint(aDestTopLeft.x, aDestTopLeft.y));
ctx->Rectangle(gfxRect(aDestTopLeft.x,
aDestTopLeft.y,
aSourceRect.width,
aSourceRect.height));
ctx->Fill();
}
/** Memory reporting **/
static const char *sDefaultSurfaceDescription =
"Memory used by gfx surface of the given type.";
struct SurfaceMemoryReporterAttrs {
const char *name;
const char *description;
};
static const SurfaceMemoryReporterAttrs sSurfaceMemoryReporterAttrs[] = {
{"gfx-surface-image", nsnull},
{"gfx-surface-pdf", nsnull},
{"gfx-surface-ps", nsnull},
{"gfx-surface-xlib",
"Memory used by xlib surfaces to store pixmaps. This memory lives in "
"the X server's process rather than in this application, so the bytes "
"accounted for here aren't counted in vsize, resident, explicit, or any of "
"the other measurements on this page."},
{"gfx-surface-xcb", nsnull},
{"gfx-surface-glitz", nsnull},
{"gfx-surface-quartz", nsnull},
{"gfx-surface-win32", nsnull},
{"gfx-surface-beos", nsnull},
{"gfx-surface-directfb", nsnull},
{"gfx-surface-svg", nsnull},
{"gfx-surface-os2", nsnull},
{"gfx-surface-win32printing", nsnull},
{"gfx-surface-quartzimage", nsnull},
{"gfx-surface-script", nsnull},
{"gfx-surface-qpainter", nsnull},
{"gfx-surface-recording", nsnull},
{"gfx-surface-vg", nsnull},
{"gfx-surface-gl", nsnull},
{"gfx-surface-drm", nsnull},
{"gfx-surface-tee", nsnull},
{"gfx-surface-xml", nsnull},
{"gfx-surface-skia", nsnull},
{"gfx-surface-subsurface", nsnull},
{"gfx-surface-d2d", nsnull},
};
PR_STATIC_ASSERT(NS_ARRAY_LENGTH(sSurfaceMemoryReporterAttrs) ==
gfxASurface::SurfaceTypeMax);
#ifdef CAIRO_HAS_D2D_SURFACE
PR_STATIC_ASSERT(PRUint32(CAIRO_SURFACE_TYPE_D2D) ==
PRUint32(gfxASurface::SurfaceTypeD2D));
#endif
PR_STATIC_ASSERT(PRUint32(CAIRO_SURFACE_TYPE_SKIA) ==
PRUint32(gfxASurface::SurfaceTypeSkia));
static const char *
SurfaceMemoryReporterPathForType(gfxASurface::gfxSurfaceType aType)
{
if (aType < 0 ||
aType >= gfxASurface::SurfaceTypeMax)
return "gfx-surface-unknown";
return sSurfaceMemoryReporterAttrs[aType].name;
}
static const char *
SurfaceMemoryReporterDescriptionForType(gfxASurface::gfxSurfaceType aType)
{
if (aType >= 0 && aType < gfxASurface::SurfaceTypeMax &&
sSurfaceMemoryReporterAttrs[aType].description)
return sSurfaceMemoryReporterAttrs[aType].description;
return sDefaultSurfaceDescription;
}
/* Surface size memory reporting */
static nsIMemoryReporter *gSurfaceMemoryReporters[gfxASurface::SurfaceTypeMax] = { 0 };
static PRInt64 gSurfaceMemoryUsed[gfxASurface::SurfaceTypeMax] = { 0 };
class SurfaceMemoryReporter :
public nsIMemoryReporter
{
public:
SurfaceMemoryReporter(gfxASurface::gfxSurfaceType aType)
: mType(aType)
{ }
NS_DECL_ISUPPORTS
NS_IMETHOD GetProcess(nsACString &process) {
process.Truncate();
return NS_OK;
}
NS_IMETHOD GetPath(nsACString &path) {
path.Assign(SurfaceMemoryReporterPathForType(mType));
return NS_OK;
}
NS_IMETHOD GetKind(PRInt32 *kind) {
*kind = KIND_OTHER;
return NS_OK;
}
NS_IMETHOD GetUnits(PRInt32 *units) {
*units = UNITS_BYTES;
return NS_OK;
}
NS_IMETHOD GetAmount(PRInt64 *amount) {
*amount = gSurfaceMemoryUsed[mType];
return NS_OK;
}
NS_IMETHOD GetDescription(nsACString &desc) {
desc.Assign(SurfaceMemoryReporterDescriptionForType(mType));
return NS_OK;
}
gfxASurface::gfxSurfaceType mType;
};
NS_IMPL_ISUPPORTS1(SurfaceMemoryReporter, nsIMemoryReporter)
void
gfxASurface::RecordMemoryUsedForSurfaceType(gfxASurface::gfxSurfaceType aType,
PRInt32 aBytes)
{
if (aType < 0 || aType >= SurfaceTypeMax) {
NS_WARNING("Invalid type to RecordMemoryUsedForSurfaceType!");
return;
}
if (gSurfaceMemoryReporters[aType] == 0) {
gSurfaceMemoryReporters[aType] = new SurfaceMemoryReporter(aType);
NS_RegisterMemoryReporter(gSurfaceMemoryReporters[aType]);
}
gSurfaceMemoryUsed[aType] += aBytes;
}
void
gfxASurface::RecordMemoryUsed(PRInt32 aBytes)
{
RecordMemoryUsedForSurfaceType(GetType(), aBytes);
mBytesRecorded += aBytes;
}
void
gfxASurface::RecordMemoryFreed()
{
if (mBytesRecorded) {
RecordMemoryUsedForSurfaceType(GetType(), -mBytesRecorded);
mBytesRecorded = 0;
}
}
void
gfxASurface::DumpAsDataURL()
{
gfxIntSize size = GetSize();
if (size.width == -1 && size.height == -1) {
printf("Could not determine surface size\n");
return;
}
nsAutoArrayPtr<PRUint8> imageBuffer(new (std::nothrow) PRUint8[size.width *
size.height *
4]);
if (!imageBuffer) {
printf("Could not allocate image buffer\n");
return;
}
nsRefPtr<gfxImageSurface> imgsurf =
new gfxImageSurface(imageBuffer.get(),
gfxIntSize(size.width, size.height),
size.width * 4,
gfxASurface::ImageFormatARGB32);
if (!imgsurf || imgsurf->CairoStatus()) {
printf("Could not allocate image surface\n");
return;
}
nsRefPtr<gfxContext> ctx = new gfxContext(imgsurf);
if (!ctx || ctx->HasError()) {
printf("Could not allocate image context\n");
return;
}
ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
ctx->SetSource(this, gfxPoint(0, 0));
ctx->Paint();
nsCOMPtr<imgIEncoder> encoder =
do_CreateInstance("@mozilla.org/image/encoder;2?type=image/png");
if (!encoder) {
PRInt32 w = NS_MIN(size.width, 8);
PRInt32 h = NS_MIN(size.height, 8);
printf("Could not create encoder. Printing %dx%d pixels.\n", w, h);
for (PRInt32 y = 0; y < h; ++y) {
for (PRInt32 x = 0; x < w; ++x) {
printf("%x ", reinterpret_cast<PRUint32*>(imageBuffer.get())[y*size.width + x]);
}
printf("\n");
}
return;
}
nsresult rv = encoder->InitFromData(imageBuffer.get(),
size.width * size.height * 4,
size.width,
size.height,
size.width * 4,
imgIEncoder::INPUT_FORMAT_HOSTARGB,
NS_LITERAL_STRING(""));
if (NS_FAILED(rv))
return;
nsCOMPtr<nsIInputStream> imgStream;
CallQueryInterface(encoder.get(), getter_AddRefs(imgStream));
if (!imgStream)
return;
PRUint32 bufSize;
rv = imgStream->Available(&bufSize);
if (NS_FAILED(rv))
return;
// ...leave a little extra room so we can call read again and make sure we
// got everything. 16 bytes for better padding (maybe)
bufSize += 16;
PRUint32 imgSize = 0;
char* imgData = (char*)PR_Malloc(bufSize);
if (!imgData)
return;
PRUint32 numReadThisTime = 0;
while ((rv = imgStream->Read(&imgData[imgSize],
bufSize - imgSize,
&numReadThisTime)) == NS_OK && numReadThisTime > 0)
{
imgSize += numReadThisTime;
if (imgSize == bufSize) {
// need a bigger buffer, just double
bufSize *= 2;
char* newImgData = (char*)PR_Realloc(imgData, bufSize);
if (!newImgData) {
PR_Free(imgData);
return;
}
imgData = newImgData;
}
}
// base 64, result will be NULL terminated
char* encodedImg = PL_Base64Encode(imgData, imgSize, nsnull);
PR_Free(imgData);
if (!encodedImg) // not sure why this would fail
return;
printf("data:image/png;base64,");
printf("%s", encodedImg);
printf("\n");
PR_Free(encodedImg);
return;
}
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