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Expose PngHandler via resources.h.

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As a private header for testing purpose. PngHandler additionally loads a
given filename if the one with '/res/images' prefix is not available. It
also provides color_type/bit_depth that are parsed from the PNG file.

This allows reusing the same code for the ResourcesTest (renamed from
ResourceTest).

Test: Run recovery_manual_test on marlin.
Change-Id: I3f939d79a1cb1b83a899847dbe2d51bde15d16d8
This commit is contained in:
Tao Bao
2018-04-13 15:25:50 -07:00
parent 0b3e25719d
commit 3d0cd1d036
3 changed files with 154 additions and 155 deletions
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minui/resources.cpp
+13 -58
View File
@@ -14,6 +14,8 @@
* limitations under the License.
*/
#include "private/resources.h"
#include <fcntl.h>
#include <linux/fb.h>
#include <linux/kd.h>
@@ -48,58 +50,13 @@ static GRSurface* malloc_surface(size_t data_size) {
return surface;
}
// This class handles the png file parsing. It also holds the ownership of the png pointer and the
// opened file pointer. Both will be destroyed/closed when this object goes out of scope.
class PngHandler {
public:
PngHandler(const std::string& name);
~PngHandler();
png_uint_32 width() const {
return width_;
}
png_uint_32 height() const {
return height_;
}
png_byte channels() const {
return channels_;
}
png_structp png_ptr() const {
return png_ptr_;
}
png_infop info_ptr() const {
return info_ptr_;
}
int error_code() const {
return error_code_;
};
operator bool() const {
return error_code_ == 0;
}
private:
png_structp png_ptr_{ nullptr };
png_infop info_ptr_{ nullptr };
png_uint_32 width_;
png_uint_32 height_;
png_byte channels_;
// The |error_code_| is set to a negative value if an error occurs when opening the png file.
int error_code_;
// After initialization, we'll keep the file pointer open before destruction of PngHandler.
std::unique_ptr<FILE, decltype(&fclose)> png_fp_;
};
PngHandler::PngHandler(const std::string& name) : error_code_(0), png_fp_(nullptr, fclose) {
PngHandler::PngHandler(const std::string& name) {
std::string res_path = android::base::StringPrintf("/res/images/%s.png", name.c_str());
png_fp_.reset(fopen(res_path.c_str(), "rbe"));
// Try to read from |name| if the resource path does not work.
if (!png_fp_) {
png_fp_.reset(fopen(name.c_str(), "rbe"));
}
if (!png_fp_) {
error_code_ = -1;
return;
@@ -138,19 +95,17 @@ PngHandler::PngHandler(const std::string& name) : error_code_(0), png_fp_(nullpt
png_set_sig_bytes(png_ptr_, sizeof(header));
png_read_info(png_ptr_, info_ptr_);
int color_type;
int bit_depth;
png_get_IHDR(png_ptr_, info_ptr_, &width_, &height_, &bit_depth, &color_type, nullptr, nullptr,
png_get_IHDR(png_ptr_, info_ptr_, &width_, &height_, &bit_depth_, &color_type_, nullptr, nullptr,
nullptr);
channels_ = png_get_channels(png_ptr_, info_ptr_);
if (bit_depth == 8 && channels_ == 3 && color_type == PNG_COLOR_TYPE_RGB) {
if (bit_depth_ == 8 && channels_ == 3 && color_type_ == PNG_COLOR_TYPE_RGB) {
// 8-bit RGB images: great, nothing to do.
} else if (bit_depth <= 8 && channels_ == 1 && color_type == PNG_COLOR_TYPE_GRAY) {
} else if (bit_depth_ <= 8 && channels_ == 1 && color_type_ == PNG_COLOR_TYPE_GRAY) {
// 1-, 2-, 4-, or 8-bit gray images: expand to 8-bit gray.
png_set_expand_gray_1_2_4_to_8(png_ptr_);
} else if (bit_depth <= 8 && channels_ == 1 && color_type == PNG_COLOR_TYPE_PALETTE) {
} else if (bit_depth_ <= 8 && channels_ == 1 && color_type_ == PNG_COLOR_TYPE_PALETTE) {
// paletted images: expand to 8-bit RGB. Note that we DON'T
// currently expand the tRNS chunk (if any) to an alpha
// channel, because minui doesn't support alpha channels in
@@ -158,8 +113,8 @@ PngHandler::PngHandler(const std::string& name) : error_code_(0), png_fp_(nullpt
png_set_palette_to_rgb(png_ptr_);
channels_ = 3;
} else {
fprintf(stderr, "minui doesn't support PNG depth %d channels %d color_type %d\n", bit_depth,
channels_, color_type);
fprintf(stderr, "minui doesn't support PNG depth %d channels %d color_type %d\n", bit_depth_,
channels_, color_type_);
error_code_ = -7;
}
}