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-rw-r--r--testing/image_diff/image_diff_png.cpp65
-rw-r--r--testing/image_diff/image_diff_png.h14
2 files changed, 73 insertions, 6 deletions
diff --git a/testing/image_diff/image_diff_png.cpp b/testing/image_diff/image_diff_png.cpp
index a5e8cdb101..56be539057 100644
--- a/testing/image_diff/image_diff_png.cpp
+++ b/testing/image_diff/image_diff_png.cpp
@@ -29,12 +29,18 @@ enum ColorFormat {
// This is the native JPEG format.
FORMAT_RGB,
+ // 3 bytes per pixel, in BGR order regardless of endianness.
+ FORMAT_BGR,
+
// 4 bytes per pixel, in RGBA order in memory regardless of endianness.
FORMAT_RGBA,
// 4 bytes per pixel, in BGRA order in memory regardless of endianness.
// This is the default Windows DIB order.
FORMAT_BGRA,
+
+ // 1 byte per pixel.
+ FORMAT_GRAY,
};
// Represents a comment in the tEXt ancillary chunk of the png.
@@ -58,6 +64,19 @@ void ConvertBetweenBGRAandRGBA(const unsigned char* input,
}
}
+void ConvertBGRtoRGB(const unsigned char* bgr,
+ int pixel_width,
+ unsigned char* rgb,
+ bool* is_opaque) {
+ for (int x = 0; x < pixel_width; x++) {
+ const unsigned char* pixel_in = &bgr[x * 3];
+ unsigned char* pixel_out = &rgb[x * 3];
+ pixel_out[0] = pixel_in[2];
+ pixel_out[1] = pixel_in[1];
+ pixel_out[2] = pixel_in[0];
+ }
+}
+
void ConvertRGBAtoRGB(const unsigned char* rgba,
int pixel_width,
unsigned char* rgb,
@@ -93,7 +112,7 @@ class PngDecoderState {
output_channels(0),
is_opaque(true),
output(o),
- row_converter(NULL),
+ row_converter(nullptr),
width(0),
height(0),
done(false) {}
@@ -217,7 +236,7 @@ void DecodeInfoCallback(png_struct* png_ptr, png_info* info_ptr) {
if (channels == 3) {
switch (state->output_format) {
case FORMAT_RGB:
- state->row_converter = NULL; // no conversion necessary
+ state->row_converter = nullptr; // no conversion necessary
state->output_channels = 3;
break;
case FORMAT_RGBA:
@@ -228,6 +247,10 @@ void DecodeInfoCallback(png_struct* png_ptr, png_info* info_ptr) {
state->row_converter = &ConvertRGBtoBGRA;
state->output_channels = 4;
break;
+ case FORMAT_GRAY:
+ state->row_converter = nullptr;
+ state->output_channels = 1;
+ break;
default:
NOTREACHED();
break;
@@ -239,7 +262,7 @@ void DecodeInfoCallback(png_struct* png_ptr, png_info* info_ptr) {
state->output_channels = 3;
break;
case FORMAT_RGBA:
- state->row_converter = NULL; // no conversion necessary
+ state->row_converter = nullptr; // no conversion necessary
state->output_channels = 4;
break;
case FORMAT_BGRA:
@@ -546,11 +569,14 @@ bool EncodeWithCompressionLevel(const unsigned char* input,
std::vector<unsigned char>* output) {
// Run to convert an input row into the output row format, NULL means no
// conversion is necessary.
- FormatConverter converter = NULL;
+ FormatConverter converter = nullptr;
int input_color_components, output_color_components;
int png_output_color_type;
switch (format) {
+ case FORMAT_BGR:
+ converter = ConvertBGRtoRGB;
+
case FORMAT_RGB:
input_color_components = 3;
output_color_components = 3;
@@ -567,7 +593,7 @@ bool EncodeWithCompressionLevel(const unsigned char* input,
} else {
output_color_components = 4;
png_output_color_type = PNG_COLOR_TYPE_RGB_ALPHA;
- converter = NULL;
+ converter = nullptr;
}
break;
@@ -584,13 +610,20 @@ bool EncodeWithCompressionLevel(const unsigned char* input,
}
break;
+ case FORMAT_GRAY:
+ input_color_components = 1;
+ output_color_components = 1;
+ png_output_color_type = PNG_COLOR_TYPE_GRAY;
+ discard_transparency = false;
+ break;
+
default:
NOTREACHED();
return false;
}
// Row stride should be at least as long as the length of the data.
- if (input_color_components * width < row_byte_width)
+ if (row_byte_width < input_color_components * width)
return false;
png_struct* png_ptr =
@@ -636,6 +669,16 @@ bool DecodePNG(const unsigned char* input,
return Decode(input, input_size, FORMAT_RGBA, output, width, height);
}
+// Encode a BGR pixel array into a PNG.
+bool EncodeBGRPNG(const unsigned char* input,
+ int width,
+ int height,
+ int row_byte_width,
+ std::vector<unsigned char>* output) {
+ return Encode(input, FORMAT_BGR, width, height, row_byte_width, false,
+ std::vector<Comment>(), output);
+}
+
// Encode an RGBA pixel array into a PNG.
bool EncodeRGBAPNG(const unsigned char* input,
int width,
@@ -657,4 +700,14 @@ bool EncodeBGRAPNG(const unsigned char* input,
discard_transparency, std::vector<Comment>(), output);
}
+// Encode a grayscale pixel array into a PNG.
+bool EncodeGrayPNG(const unsigned char* input,
+ int width,
+ int height,
+ int row_byte_width,
+ std::vector<unsigned char>* output) {
+ return Encode(input, FORMAT_GRAY, width, height, row_byte_width, false,
+ std::vector<Comment>(), output);
+}
+
} // namespace image_diff_png
diff --git a/testing/image_diff/image_diff_png.h b/testing/image_diff/image_diff_png.h
index 4d87aa1cc0..b334b20453 100644
--- a/testing/image_diff/image_diff_png.h
+++ b/testing/image_diff/image_diff_png.h
@@ -18,6 +18,13 @@ bool DecodePNG(const unsigned char* input,
int* width,
int* height);
+// Encode a BGR pixel array into a PNG.
+bool EncodeBGRPNG(const unsigned char* input,
+ int width,
+ int height,
+ int row_byte_width,
+ std::vector<unsigned char>* output);
+
// Encode an RGBA pixel array into a PNG.
bool EncodeRGBAPNG(const unsigned char* input,
int width,
@@ -33,6 +40,13 @@ bool EncodeBGRAPNG(const unsigned char* input,
bool discard_transparency,
std::vector<unsigned char>* output);
+// Encode a grayscale pixel array into a PNG.
+bool EncodeGrayPNG(const unsigned char* input,
+ int width,
+ int height,
+ int row_byte_width,
+ std::vector<unsigned char>* output);
+
} // namespace image_diff_png
#endif // TESTING_IMAGE_DIFF_IMAGE_DIFF_PNG_H_
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-19 02:13:31 +0000