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Images.cpp
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Images.cpp
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//
// Copyright 2006 The Android Open Source Project
//
// Build resource files from raw assets.
//
#define PNG_INTERNAL
#include "Images.h"
#include <utils/ResourceTypes.h>
#include <utils/ByteOrder.h>
#include <png.h>
#define NOISY(x) //x
static void
png_write_aapt_file(png_structp png_ptr, png_bytep data, png_size_t length)
{
status_t err = ((AaptFile*)png_ptr->io_ptr)->writeData(data, length);
if (err != NO_ERROR) {
png_error(png_ptr, "Write Error");
}
}
static void
png_flush_aapt_file(png_structp png_ptr)
{
}
// This holds an image as 8bpp RGBA.
struct image_info
{
image_info() : rows(NULL), is9Patch(false), allocRows(NULL) { }
~image_info() {
if (rows && rows != allocRows) {
free(rows);
}
if (allocRows) {
for (int i=0; i<(int)allocHeight; i++) {
free(allocRows[i]);
}
free(allocRows);
}
free(info9Patch.xDivs);
free(info9Patch.yDivs);
free(info9Patch.colors);
}
png_uint_32 width;
png_uint_32 height;
png_bytepp rows;
// 9-patch info.
bool is9Patch;
Res_png_9patch info9Patch;
png_uint_32 allocHeight;
png_bytepp allocRows;
};
static void read_png(const char* imageName,
png_structp read_ptr, png_infop read_info,
image_info* outImageInfo)
{
int color_type;
int bit_depth, interlace_type, compression_type;
int i;
png_read_info(read_ptr, read_info);
png_get_IHDR(read_ptr, read_info, &outImageInfo->width,
&outImageInfo->height, &bit_depth, &color_type,
&interlace_type, &compression_type, NULL);
//printf("Image %s:\n", imageName);
//printf("color_type=%d, bit_depth=%d, interlace_type=%d, compression_type=%d\n",
// color_type, bit_depth, interlace_type, compression_type);
if (color_type == PNG_COLOR_TYPE_PALETTE)
png_set_palette_to_rgb(read_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
png_set_gray_1_2_4_to_8(read_ptr);
if (png_get_valid(read_ptr, read_info, PNG_INFO_tRNS)) {
//printf("Has PNG_INFO_tRNS!\n");
png_set_tRNS_to_alpha(read_ptr);
}
if (bit_depth == 16)
png_set_strip_16(read_ptr);
if ((color_type&PNG_COLOR_MASK_ALPHA) == 0)
png_set_add_alpha(read_ptr, 0xFF, PNG_FILLER_AFTER);
if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(read_ptr);
png_read_update_info(read_ptr, read_info);
outImageInfo->rows = (png_bytepp)malloc(
outImageInfo->height * png_sizeof(png_bytep));
outImageInfo->allocHeight = outImageInfo->height;
outImageInfo->allocRows = outImageInfo->rows;
png_set_rows(read_ptr, read_info, outImageInfo->rows);
for (i = 0; i < (int)outImageInfo->height; i++)
{
outImageInfo->rows[i] = (png_bytep)
malloc(png_get_rowbytes(read_ptr, read_info));
}
png_read_image(read_ptr, outImageInfo->rows);
png_read_end(read_ptr, read_info);
NOISY(printf("Image %s: w=%d, h=%d, d=%d, colors=%d, inter=%d, comp=%d\n",
imageName,
(int)outImageInfo->width, (int)outImageInfo->height,
bit_depth, color_type,
interlace_type, compression_type));
png_get_IHDR(read_ptr, read_info, &outImageInfo->width,
&outImageInfo->height, &bit_depth, &color_type,
&interlace_type, &compression_type, NULL);
}
static bool is_tick(png_bytep p, bool transparent, const char** outError)
{
if (transparent) {
if (p[3] == 0) {
return false;
}
if (p[3] != 0xff) {
*outError = "Frame pixels must be either solid or transparent (not intermediate alphas)";
return false;
}
if (p[0] != 0 || p[1] != 0 || p[2] != 0) {
*outError = "Ticks in transparent frame must be black";
}
return true;
}
if (p[3] != 0xFF) {
*outError = "White frame must be a solid color (no alpha)";
}
if (p[0] == 0xFF && p[1] == 0xFF && p[2] == 0xFF) {
return false;
}
if (p[0] != 0 || p[1] != 0 || p[2] != 0) {
*outError = "Ticks in white frame must be black";
return false;
}
return true;
}
enum {
TICK_START,
TICK_INSIDE_1,
TICK_OUTSIDE_1
};
static status_t get_horizontal_ticks(
png_bytep row, int width, bool transparent, bool required,
int32_t* outLeft, int32_t* outRight, const char** outError,
uint8_t* outDivs, bool multipleAllowed)
{
int i;
*outLeft = *outRight = -1;
int state = TICK_START;
bool found = false;
for (i=1; i<width-1; i++) {
if (is_tick(row+i*4, transparent, outError)) {
if (state == TICK_START ||
(state == TICK_OUTSIDE_1 && multipleAllowed)) {
*outLeft = i-1;
*outRight = width-2;
found = true;
if (outDivs != NULL) {
*outDivs += 2;
}
state = TICK_INSIDE_1;
} else if (state == TICK_OUTSIDE_1) {
*outError = "Can't have more than one marked region along edge";
*outLeft = i;
return UNKNOWN_ERROR;
}
} else if (*outError == NULL) {
if (state == TICK_INSIDE_1) {
// We're done with this div. Move on to the next.
*outRight = i-1;
outRight += 2;
outLeft += 2;
state = TICK_OUTSIDE_1;
}
} else {
*outLeft = i;
return UNKNOWN_ERROR;
}
}
if (required && !found) {
*outError = "No marked region found along edge";
*outLeft = -1;
return UNKNOWN_ERROR;
}
return NO_ERROR;
}
static status_t get_vertical_ticks(
png_bytepp rows, int offset, int height, bool transparent, bool required,
int32_t* outTop, int32_t* outBottom, const char** outError,
uint8_t* outDivs, bool multipleAllowed)
{
int i;
*outTop = *outBottom = -1;
int state = TICK_START;
bool found = false;
for (i=1; i<height-1; i++) {
if (is_tick(rows[i]+offset, transparent, outError)) {
if (state == TICK_START ||
(state == TICK_OUTSIDE_1 && multipleAllowed)) {
*outTop = i-1;
*outBottom = height-2;
found = true;
if (outDivs != NULL) {
*outDivs += 2;
}
state = TICK_INSIDE_1;
} else if (state == TICK_OUTSIDE_1) {
*outError = "Can't have more than one marked region along edge";
*outTop = i;
return UNKNOWN_ERROR;
}
} else if (*outError == NULL) {
if (state == TICK_INSIDE_1) {
// We're done with this div. Move on to the next.
*outBottom = i-1;
outTop += 2;
outBottom += 2;
state = TICK_OUTSIDE_1;
}
} else {
*outTop = i;
return UNKNOWN_ERROR;
}
}
if (required && !found) {
*outError = "No marked region found along edge";
*outTop = -1;
return UNKNOWN_ERROR;
}
return NO_ERROR;
}
static uint32_t get_color(
png_bytepp rows, int left, int top, int right, int bottom)
{
png_bytep color = rows[top] + left*4;
if (left > right || top > bottom) {
return Res_png_9patch::TRANSPARENT_COLOR;
}
while (top <= bottom) {
for (int i = left; i <= right; i++) {
png_bytep p = rows[top]+i*4;
if (color[3] == 0) {
if (p[3] != 0) {
return Res_png_9patch::NO_COLOR;
}
} else if (p[0] != color[0] || p[1] != color[1]
|| p[2] != color[2] || p[3] != color[3]) {
return Res_png_9patch::NO_COLOR;
}
}
top++;
}
if (color[3] == 0) {
return Res_png_9patch::TRANSPARENT_COLOR;
}
return (color[3]<<24) | (color[0]<<16) | (color[1]<<8) | color[2];
}
static void select_patch(
int which, int front, int back, int size, int* start, int* end)
{
switch (which) {
case 0:
*start = 0;
*end = front-1;
break;
case 1:
*start = front;
*end = back-1;
break;
case 2:
*start = back;
*end = size-1;
break;
}
}
static uint32_t get_color(image_info* image, int hpatch, int vpatch)
{
int left, right, top, bottom;
select_patch(
hpatch, image->info9Patch.xDivs[0], image->info9Patch.xDivs[1],
image->width, &left, &right);
select_patch(
vpatch, image->info9Patch.yDivs[0], image->info9Patch.yDivs[1],
image->height, &top, &bottom);
//printf("Selecting h=%d v=%d: (%d,%d)-(%d,%d)\n",
// hpatch, vpatch, left, top, right, bottom);
const uint32_t c = get_color(image->rows, left, top, right, bottom);
NOISY(printf("Color in (%d,%d)-(%d,%d): #%08x\n", left, top, right, bottom, c));
return c;
}
static status_t do_9patch(const char* imageName, image_info* image)
{
image->is9Patch = true;
int W = image->width;
int H = image->height;
int i, j;
int maxSizeXDivs = W * sizeof(int32_t);
int maxSizeYDivs = H * sizeof(int32_t);
int32_t* xDivs = (int32_t*) malloc(maxSizeXDivs);
int32_t* yDivs = (int32_t*) malloc(maxSizeYDivs);
uint8_t numXDivs = 0;
uint8_t numYDivs = 0;
int8_t numColors;
int numRows;
int numCols;
int top;
int left;
int right;
int bottom;
memset(xDivs, -1, maxSizeXDivs);
memset(yDivs, -1, maxSizeYDivs);
image->info9Patch.paddingLeft = image->info9Patch.paddingRight =
image->info9Patch.paddingTop = image->info9Patch.paddingBottom = -1;
png_bytep p = image->rows[0];
bool transparent = p[3] == 0;
bool hasColor = false;
const char* errorMsg = NULL;
int errorPixel = -1;
const char* errorEdge = NULL;
int colorIndex = 0;
// Validate size...
if (W < 3 || H < 3) {
errorMsg = "Image must be at least 3x3 (1x1 without frame) pixels";
goto getout;
}
// Validate frame...
if (!transparent &&
(p[0] != 0xFF || p[1] != 0xFF || p[2] != 0xFF || p[3] != 0xFF)) {
errorMsg = "Must have one-pixel frame that is either transparent or white";
goto getout;
}
// Find left and right of sizing areas...
if (get_horizontal_ticks(p, W, transparent, true, &xDivs[0],
&xDivs[1], &errorMsg, &numXDivs, true) != NO_ERROR) {
errorPixel = xDivs[0];
errorEdge = "top";
goto getout;
}
// Find top and bottom of sizing areas...
if (get_vertical_ticks(image->rows, 0, H, transparent, true, &yDivs[0],
&yDivs[1], &errorMsg, &numYDivs, true) != NO_ERROR) {
errorPixel = yDivs[0];
errorEdge = "left";
goto getout;
}
// Find left and right of padding area...
if (get_horizontal_ticks(image->rows[H-1], W, transparent, false, &image->info9Patch.paddingLeft,
&image->info9Patch.paddingRight, &errorMsg, NULL, false) != NO_ERROR) {
errorPixel = image->info9Patch.paddingLeft;
errorEdge = "bottom";
goto getout;
}
// Find top and bottom of padding area...
if (get_vertical_ticks(image->rows, (W-1)*4, H, transparent, false, &image->info9Patch.paddingTop,
&image->info9Patch.paddingBottom, &errorMsg, NULL, false) != NO_ERROR) {
errorPixel = image->info9Patch.paddingTop;
errorEdge = "right";
goto getout;
}
// Copy patch data into image
image->info9Patch.numXDivs = numXDivs;
image->info9Patch.numYDivs = numYDivs;
image->info9Patch.xDivs = xDivs;
image->info9Patch.yDivs = yDivs;
// If padding is not yet specified, take values from size.
if (image->info9Patch.paddingLeft < 0) {
image->info9Patch.paddingLeft = xDivs[0];
image->info9Patch.paddingRight = W - 2 - xDivs[1];
} else {
// Adjust value to be correct!
image->info9Patch.paddingRight = W - 2 - image->info9Patch.paddingRight;
}
if (image->info9Patch.paddingTop < 0) {
image->info9Patch.paddingTop = yDivs[0];
image->info9Patch.paddingBottom = H - 2 - yDivs[1];
} else {
// Adjust value to be correct!
image->info9Patch.paddingBottom = H - 2 - image->info9Patch.paddingBottom;
}
NOISY(printf("Size ticks for %s: x0=%d, x1=%d, y0=%d, y1=%d\n", imageName,
image->info9Patch.xDivs[0], image->info9Patch.xDivs[1],
image->info9Patch.yDivs[0], image->info9Patch.yDivs[1]));
NOISY(printf("padding ticks for %s: l=%d, r=%d, t=%d, b=%d\n", imageName,
image->info9Patch.paddingLeft, image->info9Patch.paddingRight,
image->info9Patch.paddingTop, image->info9Patch.paddingBottom));
// Remove frame from image.
image->rows = (png_bytepp)malloc((H-2) * png_sizeof(png_bytep));
for (i=0; i<(H-2); i++) {
image->rows[i] = image->allocRows[i+1];
memmove(image->rows[i], image->rows[i]+4, (W-2)*4);
}
image->width -= 2;
W = image->width;
image->height -= 2;
H = image->height;
// Figure out the number of rows and columns in the N-patch
numCols = numXDivs + 1;
if (xDivs[0] == 0) { // Column 1 is strechable
numCols--;
}
if (xDivs[numXDivs - 1] == W) {
numCols--;
}
numRows = numYDivs + 1;
if (yDivs[0] == 0) { // Row 1 is strechable
numRows--;
}
if (yDivs[numYDivs - 1] == H) {
numRows--;
}
// Make sure the amount of rows and columns will fit in the number of
// colors we can use in the 9-patch format.
if (numRows * numCols > 0x7F) {
errorMsg = "Too many rows and columns in 9-patch perimeter";
goto getout;
}
numColors = numRows * numCols;
image->info9Patch.numColors = numColors;
image->info9Patch.colors = (uint32_t*)malloc(numColors * sizeof(uint32_t));
// Fill in color information for each patch.
uint32_t c;
top = 0;
// The first row always starts with the top being at y=0 and the bottom
// being either yDivs[1] (if yDivs[0]=0) of yDivs[0]. In the former case
// the first row is stretchable along the Y axis, otherwise it is fixed.
// The last row always ends with the bottom being bitmap.height and the top
// being either yDivs[numYDivs-2] (if yDivs[numYDivs-1]=bitmap.height) or
// yDivs[numYDivs-1]. In the former case the last row is stretchable along
// the Y axis, otherwise it is fixed.
//
// The first and last columns are similarly treated with respect to the X
// axis.
//
// The above is to help explain some of the special casing that goes on the
// code below.
// The initial yDiv and whether the first row is considered stretchable or
// not depends on whether yDiv[0] was zero or not.
for (j = (yDivs[0] == 0 ? 1 : 0);
j <= numYDivs && top < H;
j++) {
if (j == numYDivs) {
bottom = H;
} else {
bottom = yDivs[j];
}
left = 0;
// The initial xDiv and whether the first column is considered
// stretchable or not depends on whether xDiv[0] was zero or not.
for (i = xDivs[0] == 0 ? 1 : 0;
i <= numXDivs && left < W;
i++) {
if (i == numXDivs) {
right = W;
} else {
right = xDivs[i];
}
c = get_color(image->rows, left, top, right - 1, bottom - 1);
image->info9Patch.colors[colorIndex++] = c;
NOISY(if (c != Res_png_9patch::NO_COLOR) hasColor = true);
left = right;
}
top = bottom;
}
assert(colorIndex == numColors);
for (i=0; i<numColors; i++) {
if (hasColor) {
if (i == 0) printf("Colors in %s:\n ", imageName);
printf(" #%08x", image->info9Patch.colors[i]);
if (i == numColors - 1) printf("\n");
}
}
image->is9Patch = true;
image->info9Patch.deviceToFile();
getout:
if (errorMsg) {
fprintf(stderr,
"ERROR: 9-patch image %s malformed.\n"
" %s.\n", imageName, errorMsg);
if (errorEdge != NULL) {
if (errorPixel >= 0) {
fprintf(stderr,
" Found at pixel #%d along %s edge.\n", errorPixel, errorEdge);
} else {
fprintf(stderr,
" Found along %s edge.\n", errorEdge);
}
}
return UNKNOWN_ERROR;
}
return NO_ERROR;
}
static void checkNinePatchSerialization(Res_png_9patch* inPatch, void * data)
{
if (sizeof(void*) != sizeof(int32_t)) {
// can't deserialize on a non-32 bit system
return;
}
size_t patchSize = inPatch->serializedSize();
void * newData = malloc(patchSize);
memcpy(newData, data, patchSize);
Res_png_9patch* outPatch = inPatch->deserialize(newData);
// deserialization is done in place, so outPatch == newData
assert(outPatch == newData);
assert(outPatch->numXDivs == inPatch->numXDivs);
assert(outPatch->numYDivs == inPatch->numYDivs);
assert(outPatch->paddingLeft == inPatch->paddingLeft);
assert(outPatch->paddingRight == inPatch->paddingRight);
assert(outPatch->paddingTop == inPatch->paddingTop);
assert(outPatch->paddingBottom == inPatch->paddingBottom);
for (int i = 0; i < outPatch->numXDivs; i++) {
assert(outPatch->xDivs[i] == inPatch->xDivs[i]);
}
for (int i = 0; i < outPatch->numYDivs; i++) {
assert(outPatch->yDivs[i] == inPatch->yDivs[i]);
}
for (int i = 0; i < outPatch->numColors; i++) {
assert(outPatch->colors[i] == inPatch->colors[i]);
}
free(newData);
}
static bool patch_equals(Res_png_9patch& patch1, Res_png_9patch& patch2) {
if (!(patch1.numXDivs == patch2.numXDivs &&
patch1.numYDivs == patch2.numYDivs &&
patch1.numColors == patch2.numColors &&
patch1.paddingLeft == patch2.paddingLeft &&
patch1.paddingRight == patch2.paddingRight &&
patch1.paddingTop == patch2.paddingTop &&
patch1.paddingBottom == patch2.paddingBottom)) {
return false;
}
for (int i = 0; i < patch1.numColors; i++) {
if (patch1.colors[i] != patch2.colors[i]) {
return false;
}
}
for (int i = 0; i < patch1.numXDivs; i++) {
if (patch1.xDivs[i] != patch2.xDivs[i]) {
return false;
}
}
for (int i = 0; i < patch1.numYDivs; i++) {
if (patch1.yDivs[i] != patch2.yDivs[i]) {
return false;
}
}
return true;
}
static void dump_image(int w, int h, png_bytepp rows, int color_type)
{
int i, j, rr, gg, bb, aa;
int bpp;
if (color_type == PNG_COLOR_TYPE_PALETTE || color_type == PNG_COLOR_TYPE_GRAY) {
bpp = 1;
} else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
bpp = 2;
} else if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
// We use a padding byte even when there is no alpha
bpp = 4;
} else {
printf("Unknown color type %d.\n", color_type);
}
for (j = 0; j < h; j++) {
png_bytep row = rows[j];
for (i = 0; i < w; i++) {
rr = row[0];
gg = row[1];
bb = row[2];
aa = row[3];
row += bpp;
if (i == 0) {
printf("Row %d:", j);
}
switch (bpp) {
case 1:
printf(" (%d)", rr);
break;
case 2:
printf(" (%d %d", rr, gg);
break;
case 3:
printf(" (%d %d %d)", rr, gg, bb);
break;
case 4:
printf(" (%d %d %d %d)", rr, gg, bb, aa);
break;
}
if (i == (w - 1)) {
NOISY(printf("\n"));
}
}
}
}
#define MAX(a,b) ((a)>(b)?(a):(b))
#define ABS(a) ((a)<0?-(a):(a))
static void analyze_image(const char *imageName, image_info &imageInfo, int grayscaleTolerance,
png_colorp rgbPalette, png_bytep alphaPalette,
int *paletteEntries, bool *hasTransparency, int *colorType,
png_bytepp outRows)
{
int w = imageInfo.width;
int h = imageInfo.height;
int i, j, rr, gg, bb, aa, idx;
uint32_t colors[256], col;
int num_colors = 0;
int maxGrayDeviation = 0;
bool isOpaque = true;
bool isPalette = true;
bool isGrayscale = true;
// Scan the entire image and determine if:
// 1. Every pixel has R == G == B (grayscale)
// 2. Every pixel has A == 255 (opaque)
// 3. There are no more than 256 distinct RGBA colors
// NOISY(printf("Initial image data:\n"));
// dump_image(w, h, imageInfo.rows, PNG_COLOR_TYPE_RGB_ALPHA);
for (j = 0; j < h; j++) {
png_bytep row = imageInfo.rows[j];
png_bytep out = outRows[j];
for (i = 0; i < w; i++) {
rr = *row++;
gg = *row++;
bb = *row++;
aa = *row++;
int odev = maxGrayDeviation;
maxGrayDeviation = MAX(ABS(rr - gg), maxGrayDeviation);
maxGrayDeviation = MAX(ABS(gg - bb), maxGrayDeviation);
maxGrayDeviation = MAX(ABS(bb - rr), maxGrayDeviation);
if (maxGrayDeviation > odev) {
NOISY(printf("New max dev. = %d at pixel (%d, %d) = (%d %d %d %d)\n",
maxGrayDeviation, i, j, rr, gg, bb, aa));
}
// Check if image is really grayscale
if (isGrayscale) {
if (rr != gg || rr != bb) {
NOISY(printf("Found a non-gray pixel at %d, %d = (%d %d %d %d)\n",
i, j, rr, gg, bb, aa));
isGrayscale = false;
}
}
// Check if image is really opaque
if (isOpaque) {
if (aa != 0xff) {
NOISY(printf("Found a non-opaque pixel at %d, %d = (%d %d %d %d)\n",
i, j, rr, gg, bb, aa));
isOpaque = false;
}
}
// Check if image is really <= 256 colors
if (isPalette) {
col = (uint32_t) ((rr << 24) | (gg << 16) | (bb << 8) | aa);
bool match = false;
for (idx = 0; idx < num_colors; idx++) {
if (colors[idx] == col) {
match = true;
break;
}
}
// Write the palette index for the pixel to outRows optimistically
// We might overwrite it later if we decide to encode as gray or
// gray + alpha
*out++ = idx;
if (!match) {
if (num_colors == 256) {
NOISY(printf("Found 257th color at %d, %d\n", i, j));
isPalette = false;
} else {
colors[num_colors++] = col;
}
}
}
}
}
*paletteEntries = 0;
*hasTransparency = !isOpaque;
int bpp = isOpaque ? 3 : 4;
int paletteSize = w * h + bpp * num_colors;
NOISY(printf("isGrayscale = %s\n", isGrayscale ? "true" : "false"));
NOISY(printf("isOpaque = %s\n", isOpaque ? "true" : "false"));
NOISY(printf("isPalette = %s\n", isPalette ? "true" : "false"));
NOISY(printf("Size w/ palette = %d, gray+alpha = %d, rgb(a) = %d\n",
paletteSize, 2 * w * h, bpp * w * h));
NOISY(printf("Max gray deviation = %d, tolerance = %d\n", maxGrayDeviation, grayscaleTolerance));
// Choose the best color type for the image.
// 1. Opaque gray - use COLOR_TYPE_GRAY at 1 byte/pixel
// 2. Gray + alpha - use COLOR_TYPE_PALETTE if the number of distinct combinations
// is sufficiently small, otherwise use COLOR_TYPE_GRAY_ALPHA
// 3. RGB(A) - use COLOR_TYPE_PALETTE if the number of distinct colors is sufficiently
// small, otherwise use COLOR_TYPE_RGB{_ALPHA}
if (isGrayscale) {
if (isOpaque) {
*colorType = PNG_COLOR_TYPE_GRAY; // 1 byte/pixel
} else {
// Use a simple heuristic to determine whether using a palette will
// save space versus using gray + alpha for each pixel.
// This doesn't take into account chunk overhead, filtering, LZ
// compression, etc.
if (isPalette && (paletteSize < 2 * w * h)) {
*colorType = PNG_COLOR_TYPE_PALETTE; // 1 byte/pixel + 4 bytes/color
} else {
*colorType = PNG_COLOR_TYPE_GRAY_ALPHA; // 2 bytes per pixel
}
}
} else if (isPalette && (paletteSize < bpp * w * h)) {
*colorType = PNG_COLOR_TYPE_PALETTE;
} else {
if (maxGrayDeviation <= grayscaleTolerance) {
printf("%s: forcing image to gray (max deviation = %d)\n", imageName, maxGrayDeviation);
*colorType = isOpaque ? PNG_COLOR_TYPE_GRAY : PNG_COLOR_TYPE_GRAY_ALPHA;
} else {
*colorType = isOpaque ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA;
}
}
// Perform postprocessing of the image or palette data based on the final
// color type chosen
if (*colorType == PNG_COLOR_TYPE_PALETTE) {
// Create separate RGB and Alpha palettes and set the number of colors
*paletteEntries = num_colors;
// Create the RGB and alpha palettes
for (int idx = 0; idx < num_colors; idx++) {
col = colors[idx];
rgbPalette[idx].red = (png_byte) ((col >> 24) & 0xff);
rgbPalette[idx].green = (png_byte) ((col >> 16) & 0xff);
rgbPalette[idx].blue = (png_byte) ((col >> 8) & 0xff);
alphaPalette[idx] = (png_byte) (col & 0xff);
}
} else if (*colorType == PNG_COLOR_TYPE_GRAY || *colorType == PNG_COLOR_TYPE_GRAY_ALPHA) {
// If the image is gray or gray + alpha, compact the pixels into outRows
for (j = 0; j < h; j++) {
png_bytep row = imageInfo.rows[j];
png_bytep out = outRows[j];
for (i = 0; i < w; i++) {
rr = *row++;
gg = *row++;
bb = *row++;
aa = *row++;
if (isGrayscale) {
*out++ = rr;
} else {
*out++ = (png_byte) (rr * 0.2126f + gg * 0.7152f + bb * 0.0722f);
}
if (!isOpaque) {
*out++ = aa;
}
}
}
}
}
static void write_png(const char* imageName,
png_structp write_ptr, png_infop write_info,
image_info& imageInfo, int grayscaleTolerance)
{
bool optimize = true;
png_uint_32 width, height;
int color_type;
int bit_depth, interlace_type, compression_type;
int i;
png_unknown_chunk unknowns[1];
unknowns[0].data = NULL;
png_bytepp outRows = (png_bytepp) malloc((int) imageInfo.height * png_sizeof(png_bytep));
if (outRows == (png_bytepp) 0) {
printf("Can't allocate output buffer!\n");
exit(1);
}
for (i = 0; i < (int) imageInfo.height; i++) {
outRows[i] = (png_bytep) malloc(2 * (int) imageInfo.width);
if (outRows[i] == (png_bytep) 0) {
printf("Can't allocate output buffer!\n");
exit(1);
}
}
png_set_compression_level(write_ptr, Z_BEST_COMPRESSION);
NOISY(printf("Writing image %s: w = %d, h = %d\n", imageName,
(int) imageInfo.width, (int) imageInfo.height));
png_color rgbPalette[256];
png_byte alphaPalette[256];
bool hasTransparency;
int paletteEntries;
analyze_image(imageName, imageInfo, grayscaleTolerance, rgbPalette, alphaPalette,
&paletteEntries, &hasTransparency, &color_type, outRows);
// If the image is a 9-patch, we need to preserve it as a ARGB file to make
// sure the pixels will not be pre-dithered/clamped until we decide they are
if (imageInfo.is9Patch && (color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_PALETTE)) {
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
}
switch (color_type) {
case PNG_COLOR_TYPE_PALETTE:
NOISY(printf("Image %s has %d colors%s, using PNG_COLOR_TYPE_PALETTE\n",
imageName, paletteEntries,
hasTransparency ? " (with alpha)" : ""));
break;
case PNG_COLOR_TYPE_GRAY:
NOISY(printf("Image %s is opaque gray, using PNG_COLOR_TYPE_GRAY\n", imageName));
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
NOISY(printf("Image %s is gray + alpha, using PNG_COLOR_TYPE_GRAY_ALPHA\n", imageName));
break;
case PNG_COLOR_TYPE_RGB:
NOISY(printf("Image %s is opaque RGB, using PNG_COLOR_TYPE_RGB\n", imageName));
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
NOISY(printf("Image %s is RGB + alpha, using PNG_COLOR_TYPE_RGB_ALPHA\n", imageName));
break;
}
png_set_IHDR(write_ptr, write_info, imageInfo.width, imageInfo.height,
8, color_type, PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
if (color_type == PNG_COLOR_TYPE_PALETTE) {
png_set_PLTE(write_ptr, write_info, rgbPalette, paletteEntries);
if (hasTransparency) {
png_set_tRNS(write_ptr, write_info, alphaPalette, paletteEntries, (png_color_16p) 0);
}
png_set_filter(write_ptr, 0, PNG_NO_FILTERS);
} else {
png_set_filter(write_ptr, 0, PNG_ALL_FILTERS);
}
if (imageInfo.is9Patch) {
NOISY(printf("Adding 9-patch info...\n"));
strcpy((char*)unknowns[0].name, "npTc");
unknowns[0].data = (png_byte*)imageInfo.info9Patch.serialize();
unknowns[0].size = imageInfo.info9Patch.serializedSize();
// TODO: remove the check below when everything works
checkNinePatchSerialization(&imageInfo.info9Patch, unknowns[0].data);
png_set_keep_unknown_chunks(write_ptr, PNG_HANDLE_CHUNK_ALWAYS,
(png_byte*)"npTc", 1);
png_set_unknown_chunks(write_ptr, write_info, unknowns, 1);
// XXX I can't get this to work without forcibly changing
// the location to what I want... which apparently is supposed
// to be a private API, but everything else I have tried results
// in the location being set to what I -last- wrote so I never
// get written. :p
png_set_unknown_chunk_location(write_ptr, write_info, 0, PNG_HAVE_PLTE);
}
png_write_info(write_ptr, write_info);
png_bytepp rows;
if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_RGB_ALPHA) {
png_set_filler(write_ptr, 0, PNG_FILLER_AFTER);
rows = imageInfo.rows;
} else {
rows = outRows;
}
png_write_image(write_ptr, rows);
// NOISY(printf("Final image data:\n"));
// dump_image(imageInfo.width, imageInfo.height, rows, color_type);
png_write_end(write_ptr, write_info);
for (i = 0; i < (int) imageInfo.height; i++) {
free(outRows[i]);
}
free(outRows);
free(unknowns[0].data);
png_get_IHDR(write_ptr, write_info, &width, &height,
&bit_depth, &color_type, &interlace_type,
&compression_type, NULL);
NOISY(printf("Image written: w=%d, h=%d, d=%d, colors=%d, inter=%d, comp=%d\n",
(int)width, (int)height, bit_depth, color_type, interlace_type,
compression_type));
}
status_t preProcessImage(Bundle* bundle, const sp<AaptAssets>& assets,
const sp<AaptFile>& file, String8* outNewLeafName)
{
String8 ext(file->getPath().getPathExtension());
// We currently only process PNG images.
if (strcmp(ext.string(), ".png") != 0) {
return NO_ERROR;
}
// Example of renaming a file:
//*outNewLeafName = file->getPath().getBasePath().getFileName();
//outNewLeafName->append(".nupng");
String8 printableName(file->getPrintableSource());
if (bundle->getVerbose()) {
printf("Processing image: %s\n", printableName.string());
}
png_structp read_ptr = NULL;
png_infop read_info = NULL;
FILE* fp;
image_info imageInfo;
png_structp write_ptr = NULL;
png_infop write_info = NULL;
status_t error = UNKNOWN_ERROR;
const size_t nameLen = file->getPath().length();
fp = fopen(file->getSourceFile().string(), "rb");