X-Git-Url: https://git.saurik.com/android/aapt.git/blobdiff_plain/0dad19a601cb95d1c6fdaaa3e655a1687f557d66..f3cd0b05d74a86d6c812529e3752e089e2ea81e9:/Images.cpp diff --git a/Images.cpp b/Images.cpp index 7c4963f..f2414dd 100644 --- a/Images.cpp +++ b/Images.cpp @@ -33,7 +33,7 @@ png_flush_aapt_file(png_structp png_ptr) // This holds an image as 8bpp RGBA. struct image_info { - image_info() : rows(NULL), hasTransparency(true), is9Patch(false), allocRows(NULL) { } + image_info() : rows(NULL), is9Patch(false), allocRows(NULL) { } ~image_info() { if (rows && rows != allocRows) { free(rows); @@ -44,14 +44,15 @@ struct image_info } free(allocRows); } + free(info9Patch.xDivs); + free(info9Patch.yDivs); + free(info9Patch.colors); } png_uint_32 width; png_uint_32 height; png_bytepp rows; - bool hasTransparency; - // 9-patch info. bool is9Patch; Res_png_9patch info9Patch; @@ -326,22 +327,6 @@ static uint32_t get_color(image_info* image, int hpatch, int vpatch) return c; } -static void examine_image(image_info* image) -{ - bool hasTrans = false; - for (int i=0; i<(int)image->height && !hasTrans; i++) { - png_bytep p = image->rows[i]; - for (int j=0; j<(int)image->width; j++) { - if (p[(j*4)+3] != 0xFF) { - hasTrans = true; - break; - } - } - } - - image->hasTransparency = hasTrans; -} - static status_t do_9patch(const char* imageName, image_info* image) { image->is9Patch = true; @@ -350,8 +335,8 @@ static status_t do_9patch(const char* imageName, image_info* image) int H = image->height; int i, j; - int maxSizeXDivs = (W / 2 + 1) * sizeof(int32_t); - int maxSizeYDivs = (H / 2 + 1) * sizeof(int32_t); + 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; @@ -618,17 +603,69 @@ static bool patch_equals(Res_png_9patch& patch1, Res_png_9patch& patch2) { 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(image_info &imageInfo, png_colorp rgbPalette, png_bytep alphaPalette, +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; - bool trans = imageInfo.hasTransparency; 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; @@ -638,6 +675,10 @@ static void analyze_image(image_info &imageInfo, png_colorp rgbPalette, png_byte // 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]; @@ -646,23 +687,32 @@ static void analyze_image(image_info &imageInfo, png_colorp rgbPalette, png_byte gg = *row++; bb = *row++; aa = *row++; - if (!trans) { - // Ignore the actually byte and assume alpha == 255 - aa = 0xff; + + 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) { - isGrayscale = false; - } + 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) { - isOpaque = false; - } + 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 @@ -682,6 +732,7 @@ static void analyze_image(image_info &imageInfo, png_colorp rgbPalette, png_byte *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; @@ -696,6 +747,13 @@ static void analyze_image(image_info &imageInfo, png_colorp rgbPalette, png_byte 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 @@ -719,7 +777,12 @@ static void analyze_image(image_info &imageInfo, png_colorp rgbPalette, png_byte } else if (isPalette && (paletteSize < bpp * w * h)) { *colorType = PNG_COLOR_TYPE_PALETTE; } else { - *colorType = isOpaque ? PNG_COLOR_TYPE_RGB : PNG_COLOR_TYPE_RGB_ALPHA; + 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 @@ -748,11 +811,15 @@ static void analyze_image(image_info &imageInfo, png_colorp rgbPalette, png_byte bb = *row++; aa = *row++; - *out++ = rr; + if (isGrayscale) { + *out++ = rr; + } else { + *out++ = (png_byte) (rr * 0.2126f + gg * 0.7152f + bb * 0.0722f); + } if (!isOpaque) { *out++ = aa; } - } + } } } } @@ -760,7 +827,7 @@ static void analyze_image(image_info &imageInfo, png_colorp rgbPalette, png_byte static void write_png(const char* imageName, png_structp write_ptr, png_infop write_info, - image_info& imageInfo) + image_info& imageInfo, int grayscaleTolerance) { bool optimize = true; png_uint_32 width, height; @@ -769,6 +836,7 @@ static void write_png(const char* imageName, 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) { @@ -785,42 +853,42 @@ static void write_png(const char* imageName, png_set_compression_level(write_ptr, Z_BEST_COMPRESSION); - NOISY(printf("Writing image %s: w = %d, h = %d, trans = %s\n", imageName, - (int) imageInfo.width, (int) imageInfo.height, - imageInfo.hasTransparency ? "true" : "false")); + 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; - if (optimize) { - analyze_image(imageInfo, rgbPalette, alphaPalette, &paletteEntries, &hasTransparency, - &color_type, outRows); - 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; - } - } else { - // Force RGB or RGB_ALPHA color type, copy transparency from input - paletteEntries = 0; - hasTransparency = imageInfo.hasTransparency; - color_type = hasTransparency ? PNG_COLOR_TYPE_RGB_ALPHA : PNG_COLOR_TYPE_RGB; + 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, @@ -856,16 +924,18 @@ static void write_png(const char* imageName, } png_write_info(write_ptr, write_info); - - if (!imageInfo.hasTransparency) { - png_set_filler(write_ptr, 0, PNG_FILLER_AFTER); - } + png_bytepp rows; if (color_type == PNG_COLOR_TYPE_RGB || color_type == PNG_COLOR_TYPE_RGB_ALPHA) { - png_write_image(write_ptr, imageInfo.rows); + png_set_filler(write_ptr, 0, PNG_FILLER_AFTER); + rows = imageInfo.rows; } else { - png_write_image(write_ptr, outRows); + 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); @@ -873,6 +943,7 @@ static void write_png(const char* imageName, free(outRows[i]); } free(outRows); + free(unknowns[0].data); png_get_IHDR(write_ptr, write_info, &width, &height, &bit_depth, &color_type, &interlace_type, @@ -937,8 +1008,6 @@ status_t preProcessImage(Bundle* bundle, const sp& assets, read_png(printableName.string(), read_ptr, read_info, &imageInfo); - examine_image(&imageInfo); - if (nameLen > 6) { const char* name = file->getPath().string(); if (name[nameLen-5] == '9' && name[nameLen-6] == '.') { @@ -969,7 +1038,8 @@ status_t preProcessImage(Bundle* bundle, const sp& assets, goto bail; } - write_png(printableName.string(), write_ptr, write_info, imageInfo); + write_png(printableName.string(), write_ptr, write_info, imageInfo, + bundle->getGrayscaleTolerance()); error = NO_ERROR;