From c34865f55569942959da2815a790b5ad76ba0057 Mon Sep 17 00:00:00 2001
From: "Steinar H. Gunderson" <sgunderson@bigfoot.com>
Date: Sat, 15 Mar 2014 21:51:32 +0100
Subject: [PATCH] Revert "Support pad/crop from bottom, not just from the top."

This turned out not to be so useful after all, as we'd like a more
consistent top-left coordinate system, and changes to do that will
obsolete this patch.

This reverts commit e92a5ffa19eb67b4db5af1db8559630139073668.
---
 padding_effect.cpp      | 15 +++++----------
 padding_effect.h        |  5 -----
 padding_effect_test.cpp | 31 -------------------------------
 3 files changed, 5 insertions(+), 46 deletions(-)

diff --git a/padding_effect.cpp b/padding_effect.cpp
index a70025d..15381a3 100644
--- a/padding_effect.cpp
+++ b/padding_effect.cpp
@@ -14,15 +14,13 @@ PaddingEffect::PaddingEffect()
 	  output_width(1280),
 	  output_height(720),
 	  top(0),
-	  left(0),
-	  pad_from_bottom(0)
+	  left(0)
 {
 	register_vec4("border_color", (float *)&border_color);
 	register_int("width", &output_width);
 	register_int("height", &output_height);
 	register_float("top", &top);
 	register_float("left", &left);
-	register_int("pad_from_bottom", &pad_from_bottom);
 }
 
 string PaddingEffect::output_fragment_shader()
@@ -34,13 +32,10 @@ void PaddingEffect::set_gl_state(GLuint glsl_program_num, const string &prefix,
 {
 	Effect::set_gl_state(glsl_program_num, prefix, sampler_num);
 
-	float offset[2];
-	offset[0] = left / output_width;
-	if (pad_from_bottom) {
-		offset[1] = top / output_height;
-	} else {
-		offset[1] = (output_height - input_height - top) / output_height;
-	}
+	float offset[2] = {
+		left / output_width,
+		(output_height - input_height - top) / output_height
+	};
 	set_uniform_vec2(glsl_program_num, prefix, "offset", offset);
 
 	float scale[2] = {
diff --git a/padding_effect.h b/padding_effect.h
index fdefbe0..3bd4aac 100644
--- a/padding_effect.h
+++ b/padding_effect.h
@@ -11,10 +11,6 @@
 // The border color is taken to be in linear gamma, sRGB, with premultiplied alpha.
 // You may not change it after calling finalize(), since that could change the
 // graph (need_linear_light() etc. depend on the border color you choose).
-//
-// As a convenience, if the flag “pad_from_bottom” is nonzero, the “top” parameter
-// will mean pixels from the bottom (matching OpenGL's usual bottom-left convention),
-// instead of from the top as usual.
 
 #include <GL/glew.h>
 #include <string>
@@ -43,7 +39,6 @@ private:
 	int input_width, input_height;
 	int output_width, output_height;
 	float top, left;
-	int pad_from_bottom;
 };
 
 }  // namespace movit
diff --git a/padding_effect_test.cpp b/padding_effect_test.cpp
index 8c05a1e..767f3e8 100644
--- a/padding_effect_test.cpp
+++ b/padding_effect_test.cpp
@@ -208,37 +208,6 @@ TEST(PaddingEffectTest, Crop) {
 	expect_equal(expected_data, out_data, 1, 1);
 }
 
-TEST(PaddingEffectTest, CropFromBottom) {
-	float data[2 * 2] = {
-		1.0f, 0.5f,
-		0.8f, 0.3f,
-	};
-	float expected_data[1 * 1] = {
-		0.5f,
-	};
-	float out_data[1 * 1];
-
-	EffectChainTester tester(NULL, 1, 1);
-
-	ImageFormat format;
-	format.color_space = COLORSPACE_sRGB;
-	format.gamma_curve = GAMMA_LINEAR;
-
-	FlatInput *input = new FlatInput(format, FORMAT_GRAYSCALE, GL_FLOAT, 2, 2);
-	input->set_pixel_data(data);
-	tester.get_chain()->add_input(input);
-
-	Effect *effect = tester.get_chain()->add_effect(new PaddingEffect());
-	CHECK(effect->set_int("width", 1));
-	CHECK(effect->set_int("height", 1));
-	CHECK(effect->set_float("left", -1.0f));
-	CHECK(effect->set_float("top", -1.0f));
-	CHECK(effect->set_int("pad_from_bottom", 1));
-
-	tester.run(out_data, GL_RED, COLORSPACE_sRGB, GAMMA_LINEAR, OUTPUT_ALPHA_FORMAT_PREMULTIPLIED);
-	expect_equal(expected_data, out_data, 1, 1);
-}
-
 TEST(PaddingEffectTest, AlphaIsCorrectEvenWithNonLinearInputsAndOutputs) {
 	float data[2 * 1] = {
 		1.0f,
-- 
2.39.5